bt subcommand of crash occasionally does not output the backtrace normally
Issue
- This problem occurred with one vmcore in every 120 vmcores and the following warning message was displayed.
crash> bt -a
PID: 14927 TASK: ffff810059a310c0 CPU: 0 COMMAND: "dd"
#0 [ffffffff80449f20] crash_nmi_callback at ffffffff8007bf40
#1 [ffffffff80449f40] do_nmi at ffffffff8006688a
#2 [ffffffff80449f50] nmi at ffffffff80065eef
[exception RIP: system_call+3]
RIP: ffffffff8005e09b RSP: 00007fff6fe74978 RFLAGS: 00000046
RAX: 0000000000000005 RBX: 000000001a185030 RCX: 00002b3f3d1540a4
RDX: 00007fff6fe74980 RSI: 00007fff6fe74980 RDI: 0000000000000001
RBP: 000000001a185030 R8: 0000000000000001 R9: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000018f
R13: 00007fff6fe74b50 R14: 000000001a185030 R15: 000000000000000a
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
bt: WARNING: possibly bogus exception frame
--- <NMI exception stack> ---
#3 [7fff6fe74978] system_call at ffffffff8005e09b
bt: cannot transition from exception stack to current process stack:
exception stack pointer: ffffffff80449f20
process stack pointer: 7fff6fe74978
current stack base: ffff81004167a000
Environment
- Red Hat Enterprise Linux 5.5
- Kernel Version: 2.6.18-191.el5 (beta - snapshot 4)
- crash-4.1.2-4.el5
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