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[DragonFlyBSD - Bug #2282] (In Progress) gdb segfaults with certain corefiles


From: "Antonio M. Huete Jimenez via Redmine" <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 18 Jan 2012 16:40:06 -0800

Issue #2282 has been updated by Antonio M. Huete Jimenez.

Status changed from New to In Progress

Matt indicates it can be an endless recursion in gdb, as it ran out of stack.

01:24 <@dillon> info regi ... what is %rsp ?
01:25 < tuxillo> rsp            0x7fffdfffff90   0x7fffdfffff90
01:25 <@dillon> stack overflow
01:25 <@dillon> gdb got into an endless recursion probably


----------------------------------------
Bug #2282: gdb segfaults with certain corefiles
http://bugs.dragonflybsd.org/issues/2282

Author: Antonio M. Huete Jimenez
Status: In Progress
Priority: Normal
Assignee: 
Category: 
Target version: 


Hi,

In some vkernel cores (not all of them) I get gdb segfaults:

"ps" -- when kernel debugging, type out a ps-like listing of active processes.
Reading symbols from /vkernels/01/vkernel...done.

warning: core file may not match specified executable file.
[New process 1]
[New process 1]
[New process 2]
[New process 3]
[New process 4]
[New process 5]
[New process 6]
[New process 7]
Core was generated by `kernel'.
Program terminated with signal 4, Illegal instruction.
#0  <signal handler called>
(gdb) bt
#0  <signal handler called>
Segmentation fault (core dumped)

GDB backtrace itself is:

"ps" -- when kernel debugging, type out a ps-like listing of active processes.
Reading symbols from /usr/bin/gdb...done.
[New <main task>]
Core was generated by `gdb'.
Program terminated with signal 11, Segmentation fault.
#0  0x0000000801503b19 in memalloc (size=144, flags=1) at /home/source/dfbsd/lib/libc/../libc/stdlib/dmalloc.c:723
723             flags |= g_malloc_flags;

#0  0x0000000801503b19 in memalloc (size=144, flags=1) at /home/source/dfbsd/lib/libc/../libc/stdlib/dmalloc.c:723
#1  0x000000080150471c in calloc (number=<optimized out>, size=<optimized out>) at /home/source/dfbsd/lib/libc/../libc/stdlib/dmalloc.c:609
#2  0x0000000000496e5a in xcalloc (number=1, size=144) at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/utils.c:1521
#3  0x0000000000496e8b in xzalloc (size=1) at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/utils.c:1485
#4  0x0000000000407461 in exceptions_state_mc_init (func_uiout=0x4000000b70, exception=0x1, mask=2)
    at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/exceptions.c:77
#5  0x0000000000575194 in amd64_sigtramp_frame_cache (this_frame=<optimized out>, this_cache=<optimized out>)
    at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/amd64-tdep.c:2097
#6  0x0000000000575674 in amd64_sigtramp_frame_prev_register (this_frame=0x90, this_cache=0x1, regnum=2)
    at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/amd64-tdep.c:2149
#7  0x0000000000492b18 in frame_unwind_register_value (frame=0x1000041f0c8, regnum=7) at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/frame.c:953
#8  0x0000000000492db7 in frame_register_unwind (frame=0x90, regnum=1, optimizedp=0x2, unavailablep=0x7fffe0000228, lvalp=0xf0, addrp=0x7fffe0000220, realnump=0x7fffe000021c,
    bufferp=0x7fffe0000240 "") at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/frame.c:859
#9  0x0000000000492f8c in frame_unwind_register (frame=0x90, regnum=1, buf=<optimized out>)
    at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/frame.c:913
#10 0x0000000000493016 in frame_unwind_register_unsigned (frame=0x1000041f0c8, regnum=7) at /home/source/dfbsd/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb-7/gdb/frame.c:1025

(...)

backtrace repeats itself over and over ...

More information can be provided on demand.

Cheers,
Antonio Huete


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