gdb/2212: gdb (6.5) crashes right away if compiled -DGDBARCH_DEBUG=2 to trace architecture code.

anmol@freescale.com anmol@freescale.com
Thu Dec 14 01:08:00 GMT 2006


>Number:         2212
>Category:       gdb
>Synopsis:       gdb (6.5) crashes right away if compiled -DGDBARCH_DEBUG=2 to trace architecture code.
>Confidential:   no
>Severity:       critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 14 01:08:01 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     anmol@freescale.com
>Release:        GNU gdb 6.5
>Organization:
>Environment:
b07584:~> uname -a
Linux perf1vme6.am.freescale.net 2.6.9-1.ydl.4smp #1 SMP Sat Nov 13 15:59:06 EST 2004 ppc64 ppc64 ppc64 GNU/Linux
b07584:~> gcc-64 -v
Using built-in specs.
Configured with: ../gcc/configure --prefix=/local/edmar/autovect-branch/gcc64 --enable-languages=c,c++,f95 --without-cvs --target=powerpc64-unknown-linux --with-gmp=/local/edmar/support_installs64 --with-mpfr=/local/edmar/support_installs64
Thread model: posix
gcc version 4.0.0-autovect 20050301 (experimental, autovect-merge-20050127)
b07584:~> ~/src/gdb-6.5/objdir/bin/gdb --version 2> /dev/null
GNU gdb 6.5
This GDB was configured as "powerpc64-unknown-linux".
>Description:

 Description:
 ------------

 gdb (6.5) crashes right away (i.e. before it gets to the (gdb) prompt) if compiled -DGDBARCH_DEBUG=2 to trace architecture code.

 Backtrace:
 ----------

#0  0x0000008019bfb3c8 in .raise () from /lib64/tls/libc.so.6
#1  0x0000008019bfd2ac in .abort () from /lib64/tls/libc.so.6
#2  0x00000000100a0a04 in internal_vproblem (problem=0x107d1788, file=0x1076e530 "gdbarch.c", line=1858, fmt=0x1076e510 "%s: Assertion `%s' failed.",
    ap=0x1ffffffe868 "") at utils.c:786
#3  0x00000000100a0abc in internal_verror (file=0x1076e530 "gdbarch.c", line=1858, fmt=0x1076e510 "%s: Assertion `%s' failed.", ap=0x1ffffffe868 "")
    at utils.c:811
#4  0x00000000100a0b34 in internal_error (file=0x1076e530 "gdbarch.c", line=1858, string=0x1076e510 "%s: Assertion `%s' failed.") at utils.c:820
#5  0x00000000101bcbb4 in gdbarch_addr_bit (gdbarch=0x0) at gdbarch.c:1858
#6  0x00000000100a5154 in paddr_nz (addr=0) at utils.c:2584
#7  0x00000000101ba798 in gdbarch_dump (current_gdbarch=0x10954c30, file=0x108df3f0) at gdbarch.c:834
#8  0x00000000101c6cb0 in find_arch_by_info (old_gdbarch=0x107e0a80, info=
      {bfd_arch_info = 0x1084aa78, byte_order = 0, abfd = 0x0, tdep_info = 0x0, osabi = GDB_OSABI_LINUX}) at gdbarch.c:4161
#9  0x00000000101c6d44 in gdbarch_find_by_info (info=
      {bfd_arch_info = 0x1084aa78, byte_order = 0, abfd = 0x0, tdep_info = 0x0, osabi = GDB_OSABI_UNINITIALIZED}) at gdbarch.c:4178
#10 0x00000000101c8518 in gdbarch_update_p (info=
      {bfd_arch_info = 0x1084aa78, byte_order = 0, abfd = 0x0, tdep_info = 0x0, osabi = GDB_OSABI_UNINITIALIZED}) at arch-utils.c:489
#11 0x00000000101c89d4 in initialize_current_architecture () at arch-utils.c:636
#12 0x000000001009f1c8 in gdb_init (argv0=0x1fffffff9bc "/proj/.ppc_07/labhome/b07584/src/gdb-6.5/objdir/bin/gdb") at top.c:1562
#13 0x0000000010092c60 in captured_main (data=0x1fffffff1f0) at .././gdb/main.c:558
#14 0x00000000101ae7a0 in catch_errors (func=@0x1086a8f8: 0x10091f60 <captured_main>, func_args=0x1fffffff1f0, errstring=0x1073b6c8 "", mask=6)
    at exceptions.c:515
#15 0x00000000100935cc in gdb_main (args=0x1fffffff1f0) at .././gdb/main.c:843
#16 0x0000000010091ea0 in main (argc=1, argv=0x1fffffff758) at gdb.c:35

 
>How-To-Repeat:

 To reproduce crash:
 -------------------

 Here's how I configured and compiled gdb: 

 powerpc64-unknown-linux-gcc CFLAGS="-g -DGDBARCH_DEBUG=2" LDFLAGS=-Wl,-dynamic-linker,/lib64/ld64.so.1

 But essentially, compile gdb -DGDBARCH_DEBUG=2 and invoke;
 gdb crashes right away.
>Fix:

 Analysis:
 ---------

 # Here, current_gdbarch refers to the global    current_gdbarch defined in
 # gdbarch.c, line: 367

Breakpoint 4, current_gdbarch_swap_out_hack () at gdbarch.c:3893
3893      current_gdbarch = NULL;

 # ...

 # Since, GDBARCH_DEBUG is defined, non-zero, find_arch_by_info () invokes
 # gdbarch_dump () (at gdbarch.c line: 4161):

Breakpoint 1, gdbarch_dump (current_gdbarch=0x10954c30, file=0x108df3f0) at gdbarch.c:834
834       fprintf_unfiltered (file,
835                           "gdbarch_dump: decr_pc_after_break = 0x%s\n",
836                           paddr_nz (current_gdbarch->decr_pc_after_break));

 # Note the following comment right above the definition of function
 # gdbarch_dump (), about the parameter current_gdbarch:

/* NOTE/WARNING: The parameter is called ``current_gdbarch'' so that it
   just happens to match the global variable ``current_gdbarch''.  That
   way macros refering to that variable get the local and not the global
   version - ulgh.  Once everything is parameterised with gdbarch, this
   will go away. */

 # Note that the macro TARGET_ADDR_BIT in paddr_nz ():

Breakpoint 2, paddr_nz (addr=0) at utils.c:2584
2581    char *
2582    paddr_nz (CORE_ADDR addr)
2583    {
2584      return phex_nz (addr, TARGET_ADDR_BIT / 8);
2585    }

 # - by the definition:

"gdbarch.h" line:223
#if !defined (TARGET_ADDR_BIT)
#define TARGET_ADDR_BIT (gdbarch_addr_bit (current_gdbarch))
#endif

 # - refers to the global current_gdbarch, which is 0x0:

(gdb) p current_gdbarch
$41 = (struct gdbarch *) 0x0

 # Consequently, we assert, upon entering gdbarch_addr_bit ():

Breakpoint 3, gdbarch_addr_bit (gdbarch=0x0) at gdbarch.c:1858
1855    int
1856    gdbarch_addr_bit (struct gdbarch *gdbarch)
1857    {
1858      gdb_assert (gdbarch != NULL);

 # gdb aborted.

 # Note: There are two more instances of this within gdbarch_dump ().

 Fix:
 ----

 Would the two patches (attached to PR) one for gdbarch.c and the other
 for gdbarch.sh be an acceptable fix till everything gets parameterised
 with gdbarch?  (As is stated in the comment above gdbarch_dump ()).
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="patch"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="patch"

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