As reported here: https://sourceware.org/pipermail/gdb-patches/2021-February/176202.html Attaching on Solaris segfaults GDB since 10.1.
The master branch has been updated by Simon Marchi <simark@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=de146e1946ee45f2552c6b56714793a2eba9b823 commit de146e1946ee45f2552c6b56714793a2eba9b823 Author: Simon Marchi <simon.marchi@polymtl.ca> Date: Mon Feb 22 11:41:32 2021 -0500 gdb: push target earlier in procfs_target::attach (PR 27435) Since this is a GDB 9 -> 10 regression, I would like to push it to gdb-10-branch. This is a follow-up to: https://sourceware.org/pipermail/gdb-patches/2021-February/176202.html This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. - do_attach adds a thread with `add_thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault - back in procfs_target::attach, after do_attach, we push the the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. To fix this, I think we need to do the same as is done in inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds). Implement it by moving target_unpush_up to target.h, so it can be re-used here. Make procfs_target::attach use it. Note that just like is mentioned in inf_ptrace_target::attach, we should push the target before calling target_pid_to_str, so that calling target_pid_to_str ends up in procfs_target::pid_to_str. Tested by trying to attach on a process on gcc211 on the gcc compile farm. gdb/ChangeLog: PR gdb/27435 * inf-ptrace.c (struct target_unpusher): Move to target.h. (target_unpush_up): Likewise. * procfs.c (procfs_target::attach): Push target early. Use target_unpush_up to unpush target in case of error. * target.h (struct target_unpusher): Move here. (target_unpush_up): Likewise. Change-Id: I88aff8b20204e1ca1d792e27ac6bc34fc1aa0d52
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=2907db7e77c403926b2c6556d72f2c7dd19cce01 commit 2907db7e77c403926b2c6556d72f2c7dd19cce01 Author: Simon Marchi <simon.marchi@polymtl.ca> Date: Mon Feb 22 11:41:32 2021 -0500 gdb: push target earlier in procfs_target::attach (PR 27435) Since this is a GDB 9 -> 10 regression, I would like to push it to gdb-10-branch. This is a follow-up to: https://sourceware.org/pipermail/gdb-patches/2021-February/176202.html This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. - do_attach adds a thread with `add_thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault - back in procfs_target::attach, after do_attach, we push the the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. To fix this, I think we need to do the same as is done in inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds). Implement it by moving target_unpush_up to target.h, so it can be re-used here. Make procfs_target::attach use it. Note that just like is mentioned in inf_ptrace_target::attach, we should push the target before calling target_pid_to_str, so that calling target_pid_to_str ends up in procfs_target::pid_to_str. Tested by trying to attach on a process on gcc211 on the gcc compile farm. gdb/ChangeLog: PR gdb/27435 * inf-ptrace.c (struct target_unpusher): Move to target.h. (target_unpush_up): Likewise. * procfs.c (procfs_target::attach): Push target early. Use target_unpush_up to unpush target in case of error. * target.h (struct target_unpusher): Move here. (target_unpush_up): Likewise. Change-Id: I88aff8b20204e1ca1d792e27ac6bc34fc1aa0d52
Fixed.
This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. - do_attach adds a thread with `add_thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault - back in procfs_target::attach, after do_attach, we push the the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. To fix this, I think we need to do the same as is done in inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds). Implement it by moving target_unpush_up to target.h, so it can be re-used here. Make procfs_target::attach use it. Note that just like is mentioned in inf_ptrace_target::attach, we should push the target before calling target_pid_to_str, so that calling target_pid_to_str ends up in procfs_target::pid_to_str. Tested by trying to attach on a process on gcc211 on the gcc compile farm. http://sevenwonders.store/
I think we need to do the same as is done in https://www.kitchenremodeltacomawa.com/ inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds).
Since this is a GDB 9 -> 10 regression, I would like to push it to gdb-10-branch. This is a follow-up to: https://www.incineratemarketingllc.com/ This patch fixes a segfault seen when attaching to a process on Solaris.
To fix this, I think we need to do the same as is done in https://www.bathroomremodelroundrock.com inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds).
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type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./foo_gcc-9... http://www-look-4.com/ (gdb) break foo.c:13 Breakpoint 1 at 0x878: file foo.c, line 13. (gdb) run http://www.compilatori.com/ Starting program: /home/dclarke/foo_gcc-9 a = 1 &a = 0x7fefffff5bc http://www.wearelondonmade.com/ Breakpoint 1, main (argc=0, argv=0x0) at foo.c:13 13 return EXIT_SUCCESS; http://www.jopspeech.com/ (gdb) print a $1 = 0 (gdb) print &a http://joerg.li/ $2 = (int *) 0x7feffa5d49c (gdb) cont Continuing. http://connstr.net/ [Inferior 1 (process 53214) exited normally] (gdb) quit mimas$ http://embermanchester.uk/ I will attach two binaries : 1) foo_sparc64_gcc-10.xz made with gcc 10.2.1 http://www.slipstone.co.uk/ 2) foo_sparc64_gcc-9.xz made with gcc 9.3.0 I may go get sources to a previous gdb release and see if I can build http://www.logoarts.co.uk/ and test. When stepping over thread-lock related codes (in uClibc), the inferior process gets stuck and never manages to enter the critical section: ------8<------- http://www.acpirateradio.co.uk/ 1 size_t fwrite(const void * __restrict ptr, size_t size, 2 size_t nmemb, register FILE * __restrict stream) 3 { 4 size_t retval; 5 __STDIO_AUTO_THREADLOCK_VAR; 6 7 > __STDIO_AUTO_THREADLOCK(stream); https://waytowhatsnext.com/ 8 9 retval = fwrite_unlocked(ptr, size, nmemb, stream); 10 11 __STDIO_AUTO_THREADUNLOCK(stream); 12 13 return retval; https://www.webb-dev.co.uk/ 14 } ------>8------- Here, we are at line 7. Using the "next" command leads no where. However, setting a breakpoint on line 9 and issuing "continue" works. http://www.iu-bloomington.com/ Looking at the assembly instructions reveals that we're dealing with the critical section entry code [1] that should never be interrupted, in this case by the debugger's implicit breakpoints: ------8<------- ... 1 add_s r0,r13,0x38 2 mov_s r3,1 3 llock r2,[r0] <-. 4 brne.nt r2,0,14 --. | 5 scond r3,[r0] | | 6 bne -10 --|--' https://komiya-dental.com/ 7 brne_s r2,0,84 <-' ... ------>8-------
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This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: http://www.compilatori.com/computers/smartphones/ - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. http://www.wearelondonmade.com/health/check-ups/ - do_attach adds a thread with `add_thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid http://www.jopspeech.com/services/surface-duo/ - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target http://joerg.li/services/kia-rio-price/ - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault - back in procfs_target::attach, after do_attach, we push the http://connstr.net/services/mobile-games/ the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. To fix this, I think we need to do the same as is done in http://embermanchester.uk/tech/google-drive/ inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds). http://www.slipstone.co.uk/technology/cars-interior/ Implement it by moving target_unpush_up to target.h, so it can be re-used here. Make procfs_target::attach use it. Note that just like http://www.logoarts.co.uk/travel/actions-camera/ is mentioned in inf_ptrace_target::attach, we should push the target before calling target_pid_to_str, so that calling target_pid_to_str ends http://www.acpirateradio.co.uk/category/technology/ up in procfs_target::pid_to_str. Tested by trying to attach on a process on gcc211 on the gcc compile farm. https://waytowhatsnext.com/crypto/cryptocurrency-taxes/ the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault https://www.webb-dev.co.uk/health/mrna-vaccine/ - back in procfs_target::attach, after do_attach, we push the the nullptr `inf` is passed to find_thread_ptid, which dereferences http://www.iu-bloomington.com/property/properties-in-turkey/ it, causing a segfault - back in procfs_target::attach, after do_attach, we push the the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault http://www-look-4.com/tech/honor-magicbook/ - back in procfs_target::attach, after do_attach, we push the
This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: http://www.compilatori.com/tech/xiaomi/ - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. - do_attach adds a thread with `add http://www.acpirateradio.co.uk/tech/forest-fires/ _thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid http://www.logoarts.co.uk/tech/drone-cameras/ - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target http://www.slipstone.co.uk/tech/express-van/ - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault - back in procfs_target::attach, after do_attach, we push the http://embermanchester.uk/technology/telegram/ the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. http://connstr.net/tech/mars-surface/ To fix this, I think we need to do the same as is done in inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds). http://joerg.li/tech/cars-comparison/ Implement it by moving target_unpush_up to target.h, so it can be re-used here. Make procfs_target::attach use it. Note that just like is mentioned http://www.jopspeech.com/tech/xiaomi-headset/ in inf_ptrace_target::attach, we should push the target before calling target_pid_to_str, so that calling target_pid_to_str ends up in procfs_target::pid_to_str. http://www.wearelondonmade.com/tech/driving-assistant/ Tested by trying to attach on a process on gcc211 on the gcc compile farm. https://waytowhatsnext.com/health/vaccination-rates/ gdb/ChangeLog: This patch fixes a segfault seen when attaching to a process on Solaris. The steps leading to the segfault are: http://www.iu-bloomington.com/health/amoled-display/ - procfs_target::attach calls do_attach, at this point the inferior's process slot in the target stack is empty. https://komiya-dental.com/health/telegram-account/ - do_attach adds a thread with `add_thread (&the_procfs_target, ptid)` - in add_thread_silent, the passed target (&the_procfs_target) is passed to find_inferior_ptid http://www-look-4.com/services/usb-type-a/ - find_inferior_ptid returns nullptr, as there is no inferior with this ptid that has &the_procfs_target as its process target - the nullptr `inf` is passed to find_thread_ptid, which dereferences it, causing a segfault https://www.webb-dev.co.uk/property/house-sales-in-2020/ - back in procfs_target::attach, after do_attach, we push the the_procfs_target on the inferior's target stack, although we never reach this because the segfault happens before. To fix this, I think we need to do the same as is done in inf_ptrace_target::attach: push the target early and unpush it in case the attach fails (and keep it if the attach succeeds).
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