Created attachment 13091 [details] Test code to trigger the behavior On sparc64, GDB 10.1 seems to corrupt stack traces. It displays the topmost two functions just fine, but everything beyond that seems to be corrupted. Steps to reproduce: - Compile the attached gdb-test.c on sparc64. - Load the binary under GDB, set breakpoint on puts. - Run it, and when it reaches the breakpoint, print a backtrace. Expected result (from GDB 9.2): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 #2 0x0000000000100968 in main () at gdb-test.c:8 Actual result (from GDB latest git): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 Backtrace stopped: previous frame inner to this frame (corrupt stack?) Worked fine on 9.2, started experiencing problem in 10.1, and it seems that latest git version (11.0.50.20210104-git, commit e9cf3691bfa140469d52815a2307b00eecf7917c) is still problematic.
Would you be able to provide a compiled binary and core dump that reproduce this? This would give us a chance to investigate the issue on a non-sparc computer.
Can you also tell how you compiled the binary, which compiler and which command line?
Ok, I was able to reproduce this on gcc102, on the gcc compile farm. It bisected to 5b6d1e4fa4fc ("Multi-target support"). At 5b6d1e4fa4fc: $ ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x000007feffdee2d9 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) At 5b6d1e4fa4fc^: ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x00000100000007f8 in hello () at test.c:4 #2 0x0000010000000810 in main () at test.c:8 Since this is a 9 -> 10 regression, I'll mark it with the 10.2 milestone. I don't plan to look more into it at the moment. Note: I tried to generate a core file, to be able to analyze further on my local machine, but I wasn't able to load it. GDB doesn't find the registers in the core file: warning: Couldn't find general-purpose registers in core file.
Created attachment 13093 [details] Statically-compiled binary of the test case, made with GCC 9.3.0
(In reply to Simon Marchi from comment #1) > Would you be able to provide a compiled binary and core dump that reproduce > this? This would give us a chance to investigate the issue on a non-sparc > computer. Sorry for the late reply, I've attached a binary made with GCC 9.3.0. It should be easily testable under qemu-sparc64 or other emulators since it's statically-linked. It was built with a `cc -static -g -o gdb-test gdb-test.c`.
I compared a good and bad execution, and it seems it starts to diverge when we try to find an unwinder for frame 0. So the line just before this one (the backtrace is taken at the last working commit, so the parent of the multi-target commit): #0 compute_frame_id (fi=0x10007c50040) at /home/simark/src/wt/good/gdb/frame.c:549 #1 0x000001000324ddd8 in get_prev_frame_if_no_cycle (this_frame=0x10007c4f230) at /home/simark/src/wt/good/gdb/frame.c:1927 #2 0x000001000324f9f8 in get_prev_frame_always_1 (this_frame=0x10007c4f230) at /home/simark/src/wt/good/gdb/frame.c:2108 #3 0x000001000324fa38 in get_prev_frame_always (this_frame=0x10007c4f230) at /home/simark/src/wt/good/gdb/frame.c:2124 #4 0x00000100032511fc in get_prev_frame (this_frame=0x10007c4f230) at /home/simark/src/wt/good/gdb/frame.c:2376 #5 0x00000100042972c0 in backtrace_command_1 (fp_opts=..., bt_opts=..., count_exp=0x0, from_tty=1) at /home/simark/src/wt/good/gdb/stack.c:2055 #6 0x0000010004297918 in backtrace_command (arg=0x0, from_tty=1) at /home/simark/src/wt/good/gdb/stack.c:2183 #7 0x0000010002a4a538 in do_const_cfunc (c=0x10007c93390, args=0x0, from_tty=1) at /home/simark/src/wt/good/gdb/cli/cli-decode.c:107 #8 0x0000010002a56ea4 in cmd_func (cmd=0x10007c93390, args=0x0, from_tty=1) at /home/simark/src/wt/good/gdb/cli/cli-decode.c:1952 #9 0x00000100045e32e4 in execute_command (p=0x10007ab9c52 "", from_tty=1) at /home/simark/src/wt/good/gdb/top.c:653 #10 0x00000100031b21c0 in command_handler (command=0x10007ab9c50 "bt") at /home/simark/src/wt/good/gdb/event-top.c:587 #11 0x00000100031b2d4c in command_line_handler (rl=...) at /home/simark/src/wt/good/gdb/event-top.c:772 #12 0x00000100031b06e4 in gdb_rl_callback_handler (rl=0x10007cc5e30 "bt") at /home/simark/src/wt/good/gdb/event-top.c:218 #13 0x0000010004ae6410 in rl_callback_read_char () at /home/simark/src/wt/good/readline/readline/callback.c:281 #14 0x00000100031b02b0 in gdb_rl_callback_read_char_wrapper_noexcept () at /home/simark/src/wt/good/gdb/event-top.c:176 #15 0x00000100031b03d4 in gdb_rl_callback_read_char_wrapper (client_data=0x10007ab99c0) at /home/simark/src/wt/good/gdb/event-top.c:193 #16 0x00000100031b1a4c in stdin_event_handler (error=0, client_data=0x10007ab99c0) at /home/simark/src/wt/good/gdb/event-top.c:515 #17 0x00000100031aa778 in handle_file_event (file_ptr=0x10007d6aa20, ready_mask=1) at /home/simark/src/wt/good/gdb/event-loop.c:731 #18 0x00000100031ab3e0 in gdb_wait_for_event (block=1) at /home/simark/src/wt/good/gdb/event-loop.c:857 #19 0x00000100031a63f4 in gdb_do_one_event () at /home/simark/src/wt/good/gdb/event-loop.c:346 #20 0x00000100031a6450 in start_event_loop () at /home/simark/src/wt/good/gdb/event-loop.c:370 #21 0x0000010003877188 in captured_command_loop () at /home/simark/src/wt/good/gdb/main.c:360 #22 0x000001000387ad3c in captured_main (data=0x7fefffff0e8) at /home/simark/src/wt/good/gdb/main.c:1203 #23 0x000001000387ae60 in gdb_main (args=0x7fefffff0e8) at /home/simark/src/wt/good/gdb/main.c:1218 #24 0x000001000227bbf4 in main (argc=8, argv=0x7fefffff4a8) at /home/simark/src/wt/good/gdb/gdb.c:32 At this point, in the good: (gdb) p fi.unwind $11 = (const frame_unwind *) 0x10005bd2470 <dwarf2_frame_unwind> In the bad: (gdb) p fi.unwind $4 = (const frame_unwind *) 0x10006367800 <sparc64_frame_unwind>
I took a look at this bug and tracked down what I think caused the regression. If you apply this patch to GDB: diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c index 4f9c679b55c..4da94e8e0bb 100644 --- a/gdb/sparc-tdep.c +++ b/gdb/sparc-tdep.c @@ -1957,7 +1957,9 @@ sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum) { if (regnum == i || regnum == -1) { - target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); + if (target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8) == -1) + error (_("failed to read target memory at %s"), + core_addr_to_string (sp + ((i - SPARC_L0_REGNUM) * 8))); /* Handle StackGhost. */ if (i == SPARC_I7_REGNUM) Then you should find that on commit 75c6c844d9d everything is fine, but on commit 5b6d1e4fa4f you'll start seeing error. The reason is that inferior_ptid is set to something valid in the working commit, but is now null_ptid in the broken commit. As an experiment I tried hacking things so that if we get into sparc_supply_rwindow and inferior_ptid is null_ptid then we find a "suitable" value and set it, and this does indeed resolve the issue. Right now I'm trying to figure out the correct way that inferior_ptid should be getting set at this point.
I'm testing this possible patch: diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c index 4f9c679b55c..6f6157fc461 100644 --- a/gdb/sparc-tdep.c +++ b/gdb/sparc-tdep.c @@ -1948,6 +1948,11 @@ sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum) gdb_byte buf[8]; int i; + /* Ensure the correct inferior_ptid is in place before calling target + methods. */ + scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); + inferior_ptid = regcache->ptid (); + if (sp & 1) { /* Registers are 64-bit. */
(In reply to Andrew Burgess from comment #7) > I took a look at this bug and tracked down what I think caused the > regression. > > If you apply this patch to GDB: > > diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c > index 4f9c679b55c..4da94e8e0bb 100644 > --- a/gdb/sparc-tdep.c > +++ b/gdb/sparc-tdep.c > @@ -1957,7 +1957,9 @@ sparc_supply_rwindow (struct regcache *regcache, > CORE_ADDR sp, int regnum) > { > if (regnum == i || regnum == -1) > { > - target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); > + if (target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, > 8) == -1) > + error (_("failed to read target memory at %s"), > + core_addr_to_string (sp + ((i - SPARC_L0_REGNUM) * > 8))); > > /* Handle StackGhost. */ > if (i == SPARC_I7_REGNUM) Oh, it's bad that the return value of target_read_memory is not checked. When target_read_memory fails, that means we extract random bytes from `buf`.
(In reply to Andrew Burgess from comment #8) > I'm testing this possible patch: > > diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c > index 4f9c679b55c..6f6157fc461 100644 > --- a/gdb/sparc-tdep.c > +++ b/gdb/sparc-tdep.c > @@ -1948,6 +1948,11 @@ sparc_supply_rwindow (struct regcache *regcache, > CORE_ADDR sp, int regnum) > gdb_byte buf[8]; > int i; > > + /* Ensure the correct inferior_ptid is in place before calling target > + methods. */ > + scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); > + inferior_ptid = regcache->ptid (); > + > if (sp & 1) > { > /* Registers are 64-bit. */ It's curious, isn't inferior_ptid set earlier, when "backtrace_command_1" runs?
The problem is that the registers that "go wrong" are part of frame #0, which are fetched when GDB first stops. As such they end up being fetched in a call tree that originates from the ::wait, like this: #0 sparc_supply_rwindow (regcache=0x10001187fa0, sp=8791798050576, regnum=-1) at ../../src/gdb/sparc-tdep.c:1967 #1 0x000001000076171c in sparc64_supply_gregset (gregmap=0x10000be0b5c <sparc64_linux_ptrace_gregmap>, regcache=0x10001187fa0, regnum=-1, gregs=0x7feffffd260) at ../../src/gdb/sparc64-tdep.c:1974 #2 0x0000010000751094 in sparc_fetch_inferior_registers (regcache=0x10001187fa0, regnum=80) at ../../src/gdb/sparc-nat.c:170 #3 0x00000100007593f8 in sparc64_linux_nat_target::fetch_registers ( this=0x10000fa0c40 <the_sparc64_linux_nat_target>, regcache=0x10001187fa0, regnum=80) at ../../src/gdb/sparc64-linux-nat.c:38 #4 0x0000010000813d30 in target_fetch_registers (regcache=0x10001187fa0, regno=80) at ../../src/gdb/target.c:3281 #5 0x00000100006a8194 in regcache::raw_update (this=0x10001187fa0, regnum=80) at ../../src/gdb/regcache.c:584 #6 0x00000100006a82cc in readable_regcache::raw_read (this=0x10001187fa0, regnum=80, buf=0x7feffffd7f0 "") at ../../src/gdb/regcache.c:598 #7 0x00000100006a88f0 in readable_regcache::cooked_read (this=0x10001187fa0, regnum=80, buf=0x7feffffd7f0 "") at ../../src/gdb/regcache.c:690 #8 0x00000100006b1dc4 in readable_regcache::cooked_read<unsigned long, void> (this=0x10001187fa0, regnum=80, val=0x7feffffd978) at ../../src/gdb/regcache.c:777 #9 0x00000100006a907c in regcache_cooked_read_unsigned (regcache=0x10001187fa0, regnum=80, val=0x7feffffd978) at ../../src/gdb/regcache.c:791 #10 0x00000100006ab474 in regcache_read_pc (regcache=0x10001187fa0) at ../../src/gdb/regcache.c:1295 #11 0x0000010000507218 in save_stop_reason (lp=0x1000121f190) at ../../src/gdb/linux-nat.c:2612 #12 0x0000010000508ee0 in linux_nat_filter_event (lwpid=3400064, status=1407) at ../../src/gdb/linux-nat.c:3049 #13 0x00000100005098ac in linux_nat_wait_1 (ptid=..., ourstatus=0x7feffffe920, target_options=...) at ../../src/gdb/linux-nat.c:3194 #14 0x000001000050aae0 in linux_nat_target::wait (this=0x10000fa0c40 <the_sparc64_linux_nat_target>, ptid=..., ourstatus=0x7feffffe920, target_options=...) at ../../src/gdb/linux-nat.c:3432 #15 0x00000100007f810c in target_wait (ptid=..., status=0x7feffffe920, options=...) at ../../src/gdb/target.c:1994 #16 0x00000100004aba74 in do_target_wait_1 (inf=0x1000116b140, ptid=..., status=0x7feffffe920, options=...) at ../../src/gdb/infrun.c:3464 #17 0x00000100004abcb0 in operator() (__closure=0x7feffffe6a8, inf=0x1000116b140) at ../../src/gdb/infrun.c:3527 #18 0x00000100004ac0c4 in do_target_wait (wait_ptid=..., ecs=0x7feffffe8f8, options=...) at ../../src/gdb/infrun.c:3540 #19 0x00000100004ad1bc in fetch_inferior_event () at ../../src/gdb/infrun.c:3880 #20 0x0000010000484e60 in inferior_event_handler (event_type=INF_REG_EVENT) at ../../src/gdb/inf-loop.c:42 #21 0x00000100004be90c in infrun_async_inferior_event_handler (data=0x0) at ../../src/gdb/infrun.c:9216 #22 0x000001000012e9bc in check_async_event_handlers () at ../../src/gdb/async-event.c:327 #23 0x0000010000ab3ed4 in gdb_do_one_event () at ../../src/gdbsupport/event-loop.cc:216 #24 0x0000010000541f78 in start_event_loop () at ../../src/gdb/main.c:348 #25 0x000001000054218c in captured_command_loop () at ../../src/gdb/main.c:408 #26 0x0000010000544794 in captured_main (data=0x7fefffff0a8) at ../../src/gdb/main.c:1242 #27 0x000001000054483c in gdb_main (args=0x7fefffff0a8) at ../../src/gdb/main.c:1257 #28 0x00000100000c1f14 in main (argc=4, argv=0x7fefffff468) at ../../src/gdb/gdb.c:32 When we go into the wait inferior_ptid is always set to null_ptid, which makes sense, as we don't know which inferior will be giving us an event. It appears that everything called from the wait, once we do know which inferior has stopped, still has inferior_ptid set to null_ptid. Having thought about my fix a little more I do wonder if we should move the setting of inferior_ptid further up the call stack. Given that inferior_ptid does need to be set when making target_* calls, I'm tempted to say we should really set inferior_ptid possibly as early as the ::wait, once we have figured out which inferior the event is for. Have reviewed the test results, and it looks pretty good. Failures on sparc64 dropped from 7k+ to ~1.5k. One further note, placing the error where I did (after the target read) has an unfortunate effect that it prevents the target from stopping, here's a broken session: (gdb) b puts Breakpoint 1 at 0x108de4 (gdb) r Starting program: /home/aburgess/project/binutils-gdb/test/gdb-test.static failed to read target memory at 0x000007feffffeef0 (gdb) bt Selected thread is running. (gdb) Obviously this isn't a problem once we fix the setting of inferior_ptid, but it still feels kind of rubbish. I think a much better solution is: diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c index 4f9c679b55c..78f93b121c8 100644 --- a/gdb/sparc-tdep.c +++ b/gdb/sparc-tdep.c @@ -1957,7 +1962,14 @@ sparc_supply_rwindow (struct regcache *regcache, CORE_ADDR sp, int regnum) { if (regnum == i || regnum == -1) { - target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8); + if (target_read_memory (sp + ((i - SPARC_L0_REGNUM) * 8), buf, 8) == -1) + { + warning (_("failed to read 8 bytes of target memory at %s for register %s"), + core_addr_to_string (sp + ((i - SPARC_L0_REGNUM) * 8)), + gdbarch_register_name (gdbarch, i)); + regcache->raw_supply (i, nullptr); + continue; + } /* Handle StackGhost. */ if (i == SPARC_I7_REGNUM) Now the register are just marked as unavailable.
Ah ok I see, indeed at the start of ::wait inferior_ptid isn't set. > Having thought about my fix a little more I do wonder if we should move the > setting of inferior_ptid further up the call stack. Given that > inferior_ptid does need to be set when making target_* calls, I'm tempted to > say we should really set inferior_ptid possibly as early as the ::wait, once > we have figured out which inferior the event is for. I'd prefer for us to move in the opposite direction, making target methods less and less dependent on inferior_ptid. Ultimately, we would like (I think) that no target methods rely on the value of inferior_ptid on entry, instead passing the ptid (or inferior pointer or thread_info pointer) by parameter. I think it's impossible to do all that work in one shot, so the alternative is to convert methods incrementally. But so far it's not clear which methods need to be called with inferior_ptid set correctly and which methods don't, what is the contract between a target method and its callers. In my mind, fetch_registers didn't need inferior_ptid to be set, but you just found out that it's not true, because one implementation calls target_read_memory, and that one is dependent on inferior_ptid. To make forward progress towards the goal of relying less on inferior_ptid, I suggest that we keep the assumption that calling the fetch_registers method doesn't need inferior_ptid to be set. If a particular implementation needs to call some other functions which are inferior_ptid-sensitive, then it would be responsible for temporarily switching the global context to the correct thread. As time passes and we make more and more functions independent of inferior_ptid, we can move this global thread-switching to narrower and narrower scopes, until they disappear completely. On problem I see is that it's difficult to know which method/function depends on the global thread / inferior_ptid. IWBN to have a way to mark (with a comment or attribute) functions and methods to say that they do. When calling a marked function from an unmarked function, you know you need to switch the global thread for the duration of the scope.
Created attachment 13261 [details] Proposed patch (Simon) Here's what I have to propose based on my previous comment. This is the narrowest scope where I managed to put the switch_to_thread that didn't require a massive refactor. I think that can be removed once the memory reading/writing code (well, everything that uses xfer_partial) doesn't rely on the global context. Regarding this, I'd like to get back to this patch eventually: https://sourceware.org/pipermail/gdb-patches/2020-August/171215.html
Patch posted here, feedback is welcome! https://sourceware.org/pipermail/gdb-patches/2021-March/176752.html
(In reply to Simon Marchi from comment #14) > Patch posted here, feedback is welcome! > > https://sourceware.org/pipermail/gdb-patches/2021-March/176752.html Thanks for the patch, it seems to work okay here, at least: (gdb) break puts Breakpoint 1 at 0x108114: file ioputs.c, line 33. (gdb) continue Continuing. Breakpoint 1, _IO_puts (str=0x16c498 "Hello world!\n") at ioputs.c:33 33 { (gdb) backtrace #0 _IO_puts (str=0x16c498 "Hello world!\n") at ioputs.c:33 #1 0x0000000000100930 in hello () at gdb-test.c:4 #2 0x0000000000100948 in main () at gdb-test.c:8
The master branch has been updated by Simon Marchi <simark@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d1e93af64a6b74921cca9bca8a7043855f9da10d commit d1e93af64a6b74921cca9bca8a7043855f9da10d Author: Simon Marchi <simon.marchi@polymtl.ca> Date: Thu Mar 4 10:57:03 2021 -0500 gdb: set current thread in sparc_{fetch,collect}_inferior_registers (PR gdb/27147) PR 27147 shows that on sparc64, GDB is unable to properly unwind: Expected result (from GDB 9.2): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 #2 0x0000000000100968 in main () at gdb-test.c:8 Actual result (from GDB latest git): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 Backtrace stopped: previous frame inner to this frame (corrupt stack?) The first failing commit is 5b6d1e4fa4fc ("Multi-target support"). The cause of the change in behavior is due to (thanks for Andrew Burgess for finding this): - inferior_ptid is no longer set on entry of target_ops::wait, whereas it was set to something valid previously - deep down in linux_nat_target::wait (see stack trace below), we fetch the registers of the event thread - on sparc64, fetching registers involves reading memory (in sparc_supply_rwindow, see stack trace below) - reading memory (target_ops::xfer_partial) relies on inferior_ptid being set to the thread from which we want to read memory This is where things go wrong: #0 linux_nat_target::xfer_partial (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, readbuf=0x7feffe3b000 "", writebuf=0x0, offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3697 #1 0x00000100007f5b10 in raw_memory_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:912 #2 0x00000100007f60e8 in memory_xfer_partial_1 (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1043 #3 0x00000100007f61b4 in memory_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1072 #4 0x00000100007f6538 in target_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, readbuf=0x7feffe3b000 "", writebuf=0x0, offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1129 #5 0x00000100007f7094 in target_read_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, buf=0x7feffe3b000 "", offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1375 #6 0x00000100007f721c in target_read (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, buf=0x7feffe3b000 "", offset=8791798050744, len=8) at /home/simark/src/binutils-gdb/gdb/target.c:1415 #7 0x00000100007f69d4 in target_read_memory (memaddr=8791798050744, myaddr=0x7feffe3b000 "", len=8) at /home/simark/src/binutils-gdb/gdb/target.c:1218 #8 0x0000010000758520 in sparc_supply_rwindow (regcache=0x10000fea4f0, sp=8791798050736, regnum=-1) at /home/simark/src/binutils-gdb/gdb/sparc-tdep.c:1960 #9 0x000001000076208c in sparc64_supply_gregset (gregmap=0x10000be3190 <sparc64_linux_ptrace_gregmap>, regcache=0x10000fea4f0, regnum=-1, gregs=0x7feffe3b230) at /home/simark/src/binutils-gdb/gdb/sparc64-tdep.c:1974 #10 0x0000010000751b64 in sparc_fetch_inferior_registers (regcache=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/sparc-nat.c:170 #11 0x0000010000759d68 in sparc64_linux_nat_target::fetch_registers (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, regcache=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/sparc64-linux-nat.c:38 #12 0x00000100008146ec in target_fetch_registers (regcache=0x10000fea4f0, regno=80) at /home/simark/src/binutils-gdb/gdb/target.c:3287 #13 0x00000100006a8c5c in regcache::raw_update (this=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/regcache.c:584 #14 0x00000100006a8d94 in readable_regcache::raw_read (this=0x10000fea4f0, regnum=80, buf=0x7feffe3b7c0 "") at /home/simark/src/binutils-gdb/gdb/regcache.c:598 #15 0x00000100006a93b8 in readable_regcache::cooked_read (this=0x10000fea4f0, regnum=80, buf=0x7feffe3b7c0 "") at /home/simark/src/binutils-gdb/gdb/regcache.c:690 #16 0x00000100006b288c in readable_regcache::cooked_read<unsigned long, void> (this=0x10000fea4f0, regnum=80, val=0x7feffe3b948) at /home/simark/src/binutils-gdb/gdb/regcache.c:777 #17 0x00000100006a9b44 in regcache_cooked_read_unsigned (regcache=0x10000fea4f0, regnum=80, val=0x7feffe3b948) at /home/simark/src/binutils-gdb/gdb/regcache.c:791 #18 0x00000100006abf3c in regcache_read_pc (regcache=0x10000fea4f0) at /home/simark/src/binutils-gdb/gdb/regcache.c:1295 #19 0x0000010000507920 in save_stop_reason (lp=0x10000fc5b10) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:2612 #20 0x00000100005095a4 in linux_nat_filter_event (lwpid=520983, status=1407) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3050 #21 0x0000010000509f9c in linux_nat_wait_1 (ptid=..., ourstatus=0x7feffe3c8f0, target_options=...) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3194 #22 0x000001000050b1d0 in linux_nat_target::wait (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, ptid=..., ourstatus=0x7feffe3c8f0, target_options=...) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3432 #23 0x00000100007f8ac0 in target_wait (ptid=..., status=0x7feffe3c8f0, options=...) at /home/simark/src/binutils-gdb/gdb/target.c:2000 #24 0x00000100004ac17c in do_target_wait_1 (inf=0x1000116d280, ptid=..., status=0x7feffe3c8f0, options=...) at /home/simark/src/binutils-gdb/gdb/infrun.c:3464 #25 0x00000100004ac3b8 in operator() (__closure=0x7feffe3c678, inf=0x1000116d280) at /home/simark/src/binutils-gdb/gdb/infrun.c:3527 #26 0x00000100004ac7cc in do_target_wait (wait_ptid=..., ecs=0x7feffe3c8c8, options=...) at /home/simark/src/binutils-gdb/gdb/infrun.c:3540 #27 0x00000100004ad8c4 in fetch_inferior_event () at /home/simark/src/binutils-gdb/gdb/infrun.c:3880 #28 0x0000010000485568 in inferior_event_handler (event_type=INF_REG_EVENT) at /home/simark/src/binutils-gdb/gdb/inf-loop.c:42 #29 0x000001000050d394 in handle_target_event (error=0, client_data=0x0) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:4060 #30 0x0000010000ab5c8c in handle_file_event (file_ptr=0x10001207270, ready_mask=1) at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:575 #31 0x0000010000ab6334 in gdb_wait_for_event (block=0) at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:701 #32 0x0000010000ab487c in gdb_do_one_event () at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:212 #33 0x0000010000542668 in start_event_loop () at /home/simark/src/binutils-gdb/gdb/main.c:348 #34 0x000001000054287c in captured_command_loop () at /home/simark/src/binutils-gdb/gdb/main.c:408 #35 0x0000010000544e84 in captured_main (data=0x7feffe3d188) at /home/simark/src/binutils-gdb/gdb/main.c:1242 #36 0x0000010000544f2c in gdb_main (args=0x7feffe3d188) at /home/simark/src/binutils-gdb/gdb/main.c:1257 #37 0x00000100000c1f14 in main (argc=4, argv=0x7feffe3d548) at /home/simark/src/binutils-gdb/gdb/gdb.c:32 There is a target_read_memory call in sparc_supply_rwindow, whose return value is not checked. That call fails, because inferior_ptid does not contain a valid ptid, and uninitialized buffer contents is used. Ultimately it results in a corrupt stop_pc. target_ops::fetch_registers can be (and should remain, in my opinion) independent of inferior_ptid, because the ptid of the thread from which to fetch registers can be obtained from the regcache. In other words, implementations of target_ops::fetch_registers should not rely on inferior_ptid having a sensible value on entry. The sparc64_linux_nat_target::fetch_registers case is special, because it calls a target method that is dependent on the inferior_ptid value (target_read_inferior, and ultimately target_ops::xfer_partial). So I would say it's the responsibility of sparc64_linux_nat_target::fetch_registers to set up inferior_ptid correctly prior to calling target_read_inferior. This patch makes sparc64_linux_nat_target::fetch_registers (and store_registers, since it works the same) temporarily set inferior_ptid. If we ever make target_ops::xfer_partial independent of inferior_ptid, setting inferior_ptid won't be necessary, we'll simply pass down the ptid as a parameter in some way. I chose to set/restore inferior_ptid in sparc_fetch_inferior_registers, because I am not convinced that doing so in an inner location (in sparc_supply_rwindow for instance) would always be correct. We have access to the ptid in sparc_supply_rwindow (from the regcache), so we _could_ set inferior_ptid there. However, I don't want to just set inferior_ptid, as that would make it not desync'ed with `current_thread ()` and `current_inferior ()`. It's preferable to use switch_to_thread instead, as that switches all the global "current" stuff in a coherent way. But doing so requires a `thread_info *`, and getting a `thread_info *` from a ptid requires a `process_stratum_target *`. We could use `current_inferior()->process_target()` in sparc_supply_rwindow for this (using target_read_memory uses the current inferior's target stack anyway). However, sparc_supply_rwindow is also used in the context of BSD uthreads, where a thread stratum target defines threads. I presume the ptid in the regcache would be the ptid of the uthread, defined by the thread stratum target (bsd_uthread_target). Using `current_inferior()->process_target()` would look up a ptid defined by the thread stratum target using the process stratum target. I don't think it would give good results. So I prefer playing it safe and looking up the thread earlier, in sparc_fetch_inferior_registers. I added some assertions (in sparc_supply_rwindow and others) to verify that the regcache's ptid matches inferior_ptid. That verifies that the caller has properly set the correct global context. This would have caught (though a failed assertion) the current problem. gdb/ChangeLog: PR gdb/27147 * sparc-nat.h (sparc_fetch_inferior_registers): Add process_stratum_target parameter, sparc_store_inferior_registers): update callers. * sparc-nat.c (sparc_fetch_inferior_registers, sparc_store_inferior_registers): Add process_stratum_target parameter. Switch current thread before calling sparc_supply_gregset / sparc_collect_rwindow. (sparc_store_inferior_registers): Likewise. * sparc-obsd-tdep.c (sparc32obsd_supply_uthread): Add assertion. (sparc32obsd_collect_uthread): Likewise. * sparc-tdep.c (sparc_supply_rwindow, sparc_collect_rwindow): Add assertion. * sparc64-obsd-tdep.c (sparc64obsd_collect_uthread, sparc64obsd_supply_uthread): Add assertion. Change-Id: I16c658cd70896cea604516714f7e2428fbaf4301
The gdb-10-branch branch has been updated by Simon Marchi <simark@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ffc17e2c029aea90166d16f5d49503c2c2e20982 commit ffc17e2c029aea90166d16f5d49503c2c2e20982 Author: Simon Marchi <simon.marchi@polymtl.ca> Date: Thu Mar 4 10:57:03 2021 -0500 gdb: set current thread in sparc_{fetch,collect}_inferior_registers (PR gdb/27147) PR 27147 shows that on sparc64, GDB is unable to properly unwind: Expected result (from GDB 9.2): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 #2 0x0000000000100968 in main () at gdb-test.c:8 Actual result (from GDB latest git): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 Backtrace stopped: previous frame inner to this frame (corrupt stack?) The first failing commit is 5b6d1e4fa4fc ("Multi-target support"). The cause of the change in behavior is due to (thanks for Andrew Burgess for finding this): - inferior_ptid is no longer set on entry of target_ops::wait, whereas it was set to something valid previously - deep down in linux_nat_target::wait (see stack trace below), we fetch the registers of the event thread - on sparc64, fetching registers involves reading memory (in sparc_supply_rwindow, see stack trace below) - reading memory (target_ops::xfer_partial) relies on inferior_ptid being set to the thread from which we want to read memory This is where things go wrong: #0 linux_nat_target::xfer_partial (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, readbuf=0x7feffe3b000 "", writebuf=0x0, offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3697 #1 0x00000100007f5b10 in raw_memory_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:912 #2 0x00000100007f60e8 in memory_xfer_partial_1 (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1043 #3 0x00000100007f61b4 in memory_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, readbuf=0x7feffe3b000 "", writebuf=0x0, memaddr=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1072 #4 0x00000100007f6538 in target_xfer_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, readbuf=0x7feffe3b000 "", writebuf=0x0, offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1129 #5 0x00000100007f7094 in target_read_partial (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, buf=0x7feffe3b000 "", offset=8791798050744, len=8, xfered_len=0x7feffe3ae88) at /home/simark/src/binutils-gdb/gdb/target.c:1375 #6 0x00000100007f721c in target_read (ops=0x10000fa2c40 <the_sparc64_linux_nat_target>, object=TARGET_OBJECT_MEMORY, annex=0x0, buf=0x7feffe3b000 "", offset=8791798050744, len=8) at /home/simark/src/binutils-gdb/gdb/target.c:1415 #7 0x00000100007f69d4 in target_read_memory (memaddr=8791798050744, myaddr=0x7feffe3b000 "", len=8) at /home/simark/src/binutils-gdb/gdb/target.c:1218 #8 0x0000010000758520 in sparc_supply_rwindow (regcache=0x10000fea4f0, sp=8791798050736, regnum=-1) at /home/simark/src/binutils-gdb/gdb/sparc-tdep.c:1960 #9 0x000001000076208c in sparc64_supply_gregset (gregmap=0x10000be3190 <sparc64_linux_ptrace_gregmap>, regcache=0x10000fea4f0, regnum=-1, gregs=0x7feffe3b230) at /home/simark/src/binutils-gdb/gdb/sparc64-tdep.c:1974 #10 0x0000010000751b64 in sparc_fetch_inferior_registers (regcache=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/sparc-nat.c:170 #11 0x0000010000759d68 in sparc64_linux_nat_target::fetch_registers (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, regcache=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/sparc64-linux-nat.c:38 #12 0x00000100008146ec in target_fetch_registers (regcache=0x10000fea4f0, regno=80) at /home/simark/src/binutils-gdb/gdb/target.c:3287 #13 0x00000100006a8c5c in regcache::raw_update (this=0x10000fea4f0, regnum=80) at /home/simark/src/binutils-gdb/gdb/regcache.c:584 #14 0x00000100006a8d94 in readable_regcache::raw_read (this=0x10000fea4f0, regnum=80, buf=0x7feffe3b7c0 "") at /home/simark/src/binutils-gdb/gdb/regcache.c:598 #15 0x00000100006a93b8 in readable_regcache::cooked_read (this=0x10000fea4f0, regnum=80, buf=0x7feffe3b7c0 "") at /home/simark/src/binutils-gdb/gdb/regcache.c:690 #16 0x00000100006b288c in readable_regcache::cooked_read<unsigned long, void> (this=0x10000fea4f0, regnum=80, val=0x7feffe3b948) at /home/simark/src/binutils-gdb/gdb/regcache.c:777 #17 0x00000100006a9b44 in regcache_cooked_read_unsigned (regcache=0x10000fea4f0, regnum=80, val=0x7feffe3b948) at /home/simark/src/binutils-gdb/gdb/regcache.c:791 #18 0x00000100006abf3c in regcache_read_pc (regcache=0x10000fea4f0) at /home/simark/src/binutils-gdb/gdb/regcache.c:1295 #19 0x0000010000507920 in save_stop_reason (lp=0x10000fc5b10) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:2612 #20 0x00000100005095a4 in linux_nat_filter_event (lwpid=520983, status=1407) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3050 #21 0x0000010000509f9c in linux_nat_wait_1 (ptid=..., ourstatus=0x7feffe3c8f0, target_options=...) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3194 #22 0x000001000050b1d0 in linux_nat_target::wait (this=0x10000fa2c40 <the_sparc64_linux_nat_target>, ptid=..., ourstatus=0x7feffe3c8f0, target_options=...) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:3432 #23 0x00000100007f8ac0 in target_wait (ptid=..., status=0x7feffe3c8f0, options=...) at /home/simark/src/binutils-gdb/gdb/target.c:2000 #24 0x00000100004ac17c in do_target_wait_1 (inf=0x1000116d280, ptid=..., status=0x7feffe3c8f0, options=...) at /home/simark/src/binutils-gdb/gdb/infrun.c:3464 #25 0x00000100004ac3b8 in operator() (__closure=0x7feffe3c678, inf=0x1000116d280) at /home/simark/src/binutils-gdb/gdb/infrun.c:3527 #26 0x00000100004ac7cc in do_target_wait (wait_ptid=..., ecs=0x7feffe3c8c8, options=...) at /home/simark/src/binutils-gdb/gdb/infrun.c:3540 #27 0x00000100004ad8c4 in fetch_inferior_event () at /home/simark/src/binutils-gdb/gdb/infrun.c:3880 #28 0x0000010000485568 in inferior_event_handler (event_type=INF_REG_EVENT) at /home/simark/src/binutils-gdb/gdb/inf-loop.c:42 #29 0x000001000050d394 in handle_target_event (error=0, client_data=0x0) at /home/simark/src/binutils-gdb/gdb/linux-nat.c:4060 #30 0x0000010000ab5c8c in handle_file_event (file_ptr=0x10001207270, ready_mask=1) at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:575 #31 0x0000010000ab6334 in gdb_wait_for_event (block=0) at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:701 #32 0x0000010000ab487c in gdb_do_one_event () at /home/simark/src/binutils-gdb/gdbsupport/event-loop.cc:212 #33 0x0000010000542668 in start_event_loop () at /home/simark/src/binutils-gdb/gdb/main.c:348 #34 0x000001000054287c in captured_command_loop () at /home/simark/src/binutils-gdb/gdb/main.c:408 #35 0x0000010000544e84 in captured_main (data=0x7feffe3d188) at /home/simark/src/binutils-gdb/gdb/main.c:1242 #36 0x0000010000544f2c in gdb_main (args=0x7feffe3d188) at /home/simark/src/binutils-gdb/gdb/main.c:1257 #37 0x00000100000c1f14 in main (argc=4, argv=0x7feffe3d548) at /home/simark/src/binutils-gdb/gdb/gdb.c:32 There is a target_read_memory call in sparc_supply_rwindow, whose return value is not checked. That call fails, because inferior_ptid does not contain a valid ptid, and uninitialized buffer contents is used. Ultimately it results in a corrupt stop_pc. target_ops::fetch_registers can be (and should remain, in my opinion) independent of inferior_ptid, because the ptid of the thread from which to fetch registers can be obtained from the regcache. In other words, implementations of target_ops::fetch_registers should not rely on inferior_ptid having a sensible value on entry. The sparc64_linux_nat_target::fetch_registers case is special, because it calls a target method that is dependent on the inferior_ptid value (target_read_inferior, and ultimately target_ops::xfer_partial). So I would say it's the responsibility of sparc64_linux_nat_target::fetch_registers to set up inferior_ptid correctly prior to calling target_read_inferior. This patch makes sparc64_linux_nat_target::fetch_registers (and store_registers, since it works the same) temporarily set inferior_ptid. If we ever make target_ops::xfer_partial independent of inferior_ptid, setting inferior_ptid won't be necessary, we'll simply pass down the ptid as a parameter in some way. I chose to set/restore inferior_ptid in sparc_fetch_inferior_registers, because I am not convinced that doing so in an inner location (in sparc_supply_rwindow for instance) would always be correct. We have access to the ptid in sparc_supply_rwindow (from the regcache), so we _could_ set inferior_ptid there. However, I don't want to just set inferior_ptid, as that would make it not desync'ed with `current_thread ()` and `current_inferior ()`. It's preferable to use switch_to_thread instead, as that switches all the global "current" stuff in a coherent way. But doing so requires a `thread_info *`, and getting a `thread_info *` from a ptid requires a `process_stratum_target *`. We could use `current_inferior()->process_target()` in sparc_supply_rwindow for this (using target_read_memory uses the current inferior's target stack anyway). However, sparc_supply_rwindow is also used in the context of BSD uthreads, where a thread stratum target defines threads. I presume the ptid in the regcache would be the ptid of the uthread, defined by the thread stratum target (bsd_uthread_target). Using `current_inferior()->process_target()` would look up a ptid defined by the thread stratum target using the process stratum target. I don't think it would give good results. So I prefer playing it safe and looking up the thread earlier, in sparc_fetch_inferior_registers. I added some assertions (in sparc_supply_rwindow and others) to verify that the regcache's ptid matches inferior_ptid. That verifies that the caller has properly set the correct global context. This would have caught (though a failed assertion) the current problem. gdb/ChangeLog: PR gdb/27147 * sparc-nat.h (sparc_fetch_inferior_registers): Add process_stratum_target parameter, sparc_store_inferior_registers): update callers. * sparc-nat.c (sparc_fetch_inferior_registers, sparc_store_inferior_registers): Add process_stratum_target parameter. Switch current thread before calling sparc_supply_gregset / sparc_collect_rwindow. (sparc_store_inferior_registers): Likewise. * sparc-obsd-tdep.c (sparc32obsd_supply_uthread): Add assertion. (sparc32obsd_collect_uthread): Likewise. * sparc-tdep.c (sparc_supply_rwindow, sparc_collect_rwindow): Add assertion. * sparc64-obsd-tdep.c (sparc64obsd_collect_uthread, sparc64obsd_supply_uthread): Add assertion. Change-Id: I16c658cd70896cea604516714f7e2428fbaf4301
Fixed.
Woops, fixed.
Expected result (from GDB 9.2): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 #2 0x0000000000100968 in main () at gdb-test.c:8 Actual result (from GDB latest git): #0 0x0000000000108de4 in puts () #1 0x0000000000100950 in hello () at gdb-test.c:4 Backtrace stopped: previous frame inner to this frame (corrupt stack?) Worked fine on 9.2, started experiencing problem in 10.1, and it seems that latest git version (11.0.50.20210104-git, commit e9cf3691bfa140469d52815a2307b00eecf7917c) is still problematic. http://betwsycoednet.online
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outputs/gdb.fortran/function-calls/function-calls \ -ex "break 241" \ -ex "run" \ -ex "p c_nd" \ http://www-look-4.com/ -ex "p derived_types_and_module_calls::pass_cart_nd(c_nd)" +break 241 Breakpoint 1 at 0x4018bc: file function-calls.f90, line 241. +run (2.09999990,3.29999995) http://www.compilatori.com/ 4 5 23 (2.09999990,3.29999995) 3.40000010 http://www.wearelondonmade.com/ 6 Breakpoint 1, function_calls () at function-calls.f90:241 241 deallocate(c_nd%d) ! post_init http://www.jopspeech.com/ +p c_nd Cannot access memory at address 0x4 +p derived_types_and_module_calls::pass_cart_nd(c_nd) http://joerg.li/ Program received signal SIGSEGV, Segmentation fault. 0x0000000000400f93 in derived_types_and_module_calls::pass_cart_nd (c=<error reading variable: Cannot access memory at address 0xc>) at http://connstr.net/ /home/vries/gdb_versions/devel/src/gdb/testsuite/gdb.fortran/function-calls.f90:130 http://embermanchester.uk/ 130 pass_cart_nd = ubound(c%d,1,4) The program being debugged was signaled while in a function called from GDB. GDB remains in the frame where the signal was received. http://www.slipstone.co.uk/ To change this behavior use "set unwindonsignal on". Evaluation of the expression containing the function (derived_types_and_module_calls::pass_cart_nd) will be abandoned. http://www.logoarts.co.uk/ 5b6d1e4fa4fc: $ ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 http://www.acpirateradio.co.uk/ Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x000007feffdee2d9 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) At 5b6d1e4fa4fc^: https://waytowhatsnext.com/ ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 https://www.webb-dev.co.uk/ #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x00000100000007f8 in hello () at test.c:4 #2 0x0000010000000810 in main () at test.c:8 http://www.iu-bloomington.com/ Since this is a 9 -> 10 regression, I'll mark it with the 10.2 milestone. I don't plan to look more into it at the moment. Note: I tried to generate a core file, to be able to analyze further on my local machine, but I wasn't able to load it. GDB doesn't find the 5b6d1e4fa4fc: $ ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x000007feffdee2d9 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?) At 5b6d1e4fa4fc^: https://komiya-dental.com/ ./binutils-gdb/gdb/gdb --data-directory binutils-gdb/gdb/data-directory -batch a.out -ex "b puts" -ex "r" -ex "bt" Breakpoint 1 at 0x1021a0 Breakpoint 1, 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #0 0xffff80010019c63c in puts () from /lib/sparc64-linux-gnu/libc.so.6 #1 0x00000100000007f8 in hello () at test.c:4 #2 0x0000010000000810 in main () at test.c:8 Since this is a 9 -> 10 regression, I'll mark it with the 10.2 milestone. I don't plan to look more into it at the moment. Note: I tried to generate a core file, to be able to analyze further on my local machine, but I wasn't able to load it. GDB doesn't find the
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[gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint https://komiya-dental.com/crypto/new-coins/ The test-case nextoverthrow.exp is failing on targets with unstripped libc. This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". http://www-look-4.com/health/winter-sickness/ The problem is that this code in create_exception_master_breakpoint: ... http://www.iu-bloomington.com/crypto/china-affect-on-crypto/ for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... https://www.webb-dev.co.uk/crypto/crypto-fell/ iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. https://waytowhatsnext.com/crypto/cryptocurrency-taxes/ Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. http://www.acpirateradio.co.uk/technology/facetime/ Tested on x86_64-linux. [gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint http://www.logoarts.co.uk/computers/printer-types/ The test-case nextoverthrow.exp is failing on targets with unstripped libc. http://www.slipstone.co.uk/computers/isofix/ This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". http://embermanchester.uk/computers/video-conversation/ The problem is that this code in create_exception_master_breakpoint: ... http://connstr.net/computers/chargers-tech/ for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... http://joerg.li/health/xiaomi/ iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. http://www.jopspeech.com/property/slim-pen-2/ Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. http://www.wearelondonmade.com/health/check-ups/ Tested on x86_64-linux. [gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint http://www.compilatori.com/property/dark-mode/ The test-case nextoverthrow.exp is failing on targets with unstripped libc. This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". The problem is that this code in create_exception_master_breakpoint: ... https://manta-termica.com/ https://shade-cloth.net/ https://trellis-netting.net/ https://invernavelo.net/ https://marijuana-netting.net/ https://gallinero.mx/ https://control-de-palomas.mx/ https://guacamalla.net/ for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. https://scrog.mx/ https://cannabis-netting.net/ https://casa-sombra.mx/ https://ground-cover.mx/ https://hortomallas.es/ https://malla-espaldera.mx/ https://malla-pepinera.com/ https://malla-sombra.mx/ Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. Tested on x86_64-linux. [gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint https://www.hortomallas.com/en/grow-pumpkin-on-trellises-netting/ https://www.hortomallas.com/malla-plastica-para-jardin-canceles-vallas-rejas/ http://frost-fabric.net/ http://gancho-tutoreo-tenax.net/ http://flower-supports.net/ http://hail-protection-net.com/ https://www.hortomallas.net/ http://macro-tunel.com/ The test-case nextoverthrow.exp is failing on targets with unstripped libc. This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". The problem is that this code in create_exception_master_breakpoint: ... for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... https://mohamie-jeddah.com/ https://www.beyandiet.com/ https://www.bebealis.com/ https://byothe.fr/ https://ns-communication.fr/ https://www.hortomallas.com/en/the-advantage-of-chicken-wire-mesh-with-hexagonal-netting/ https://www.hortomallas.com/en/how-tall-should-the-cucumber-trellis-height-be/ https://www.hortomallas.com/precio-la-tela-gallinera-bajo/ https://www.hortomallas.com/en/best-price-of-the-chicken-netting-save-money-with-chickenmalla/ https://www.hortomallas.com/en/tomato-cages/ https://www.hortomallas.com/en/product-category/privacy-and-windbreakers/polisombra-total-privacy/ iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. Tested on x86_64-linux. [gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint The test-case nextoverthrow.exp is failing on targets with unstripped libc. This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". https://www.station-alexandre.com/ https://fintechzoom.com/lifestyle/entertainment/gaming/ro-ghoul/roblox-ro-ghoul-codes/ https://www.hunny-pool.com/ https://www.formations-continues.com/ https://nutrienta.co/ https://2macp.fr/ https://mymystore.online/ https://www.antiguachiamaitalia.it/ https://rattanmart.com/ https://bohemiansmart.com/ The problem is that this code in create_exception_master_breakpoint: ... for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. https://mohamie-saudi.com/ https://fintechzoom.com/lifestyle/entertainment/gaming/rimworld/the-best-rimworld-mods/ https://www.nimblehand.com/ https://geoslam.xyz/ https://fintechzoom.com/lifestyle/entertainment/gaming/tower-defense-simulator/codes/ https://www.lafabriquedeslutins.fr/ Tested on x86_64-linux. [gdb/breakpoints] Handle glibc with debuginfo in create_exception_master_breakpoint The test-case nextoverthrow.exp is failing on targets with unstripped libc. This is a regression since commit 1940319c0ef "[gdb] Fix internal-error in process_event_stop_test". The problem is that this code in create_exception_master_breakpoint: ... for (objfile *sepdebug = obj->separate_debug_objfile; sepdebug != nullptr; sepdebug = sepdebug->separate_debug_objfile) if (create_exception_master_breakpoint_hook (sepdebug)) ... https://fintechzoom.com/lifestyle/entertainment/gaming/final-fantasy/ffxiv-classes-guide-on-final-fantasy-14-select-the-best-job/ https://www.mindrnd.com/ https://akoestiekopmaat.nl/ https://fintechzoom.com/lifestyle/entertainment/gaming/zombie-games-do-you-know-what-are-the-best-games-for-pc-in-2021/ https://www.cinogel.com/ iterates over all the separate debug object files, but fails to handle the case that obj itself has the debug info we're looking for. Fix this by using the separate_debug_objfiles () range instead, which does iterate both over obj and the obj->separate_debug_objfile chain. Tested on x86_64-linux.
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