[DragonFlyBSD - Bug #2282] gdb segfaults with certain corefiles

[Antonio M. Huete Jimenez via Redmine]

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

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

Author: Antonio M. Huete Jimenez
Status: New
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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