[Crash-utility] if it's normal to get into kdb shell when run crash

[Liu, Jianbo (James)]

Hi Experts:

Sorry for disturbing you again.

When I run crash to debug vmcore, if kernel enable kgdb, it will get into kdb shell directly not crash shell, althrough I can get into crash via execute two go command in kdb shell, not sure if it's normal, do you have some comments on it?


When I disnable kgdb in kernel, there will not be this kind of issue, if there is some compatibility problem between kgdb and crash tool?

Thanks for your time and happen new year!!

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root at localhost:~/coredump>sh testcoredump.sh; sh startcoredump.sh
segment[0].mem:0x2000000 memsz:9183232
segment[1].mem:0x28c2000 memsz:65536
segment[2].mem:0x28d2000 memsz:4096
segment[3].mem:0x28d3000 memsz:28672
segment[4].mem:0x2ff5000 memsz:45056
SysRq : Trigger a crash

Entering kdb (current=0xdb17f900, pid 822) on processor 1 Oops: (null)
due to oops @ 0xc0348f64
NIP: c0348f64 LR: c034974c CTR: c0348f50
REGS: db18ddc0 TRAP: 0300   Not tainted  (2.6.34.15-grsec-WR4.3.0.0_cgl)
MSR: 00021202 <ME,CE,DE>  CR: 20242444  XER: 00000000
DEAR: 00000000, ESR: 00800000
TASK = db17f900[822] 'sh' THREAD: db18c000 CPU: 1
GPR00: 00000001 db18de70 db17f900 00000063 00000000 ffffffff c035e930 00000000
GPR08: 00008000 00000000 00000054 118c6000 20242444 100b84b8 100b0828 100b0904
GPR16: 00000000 00000000 00000000 1006d2d0 00000000 100cc220 1006b530 00000000
GPR24: 00000001 c0780d24 00029202 c0780e08 c0770000 00000000 c08578a4 00000063
NIP [c0348f64] sysrq_handle_crash+0x14/0x20
LR [c034974c] __handle_sysrq+0xcc/0x1d0
Call Trace:
[db18de70] [c0349734] __handle_sysrq+0xb4/0x1d0 (unreliable)
[db18dea0] [c03498ac] write_sysrq_trigger+0x5c/0x70
[db18deb0] [c01662f0] proc_reg_write+0x80/0xc0
[db18dee0] [c010ec50] vfs_write+0xc0/0x170
[db18df00] [c010ee80] sys_write+0x50/0x110
[db18df40] [c0011d58] ret_from_syscall+0x0/0x4
--- Exception: c01 at 0xff16ba4
    LR = 0xfebad5c
Instruction dump:
[1]more>
39600003 7d605f9e 556b103a 7c005b78 98090003 4e800020 60000000 38000001
3d20c07a 90092170 7c0004ac 39200000 <98090000> 4e800020 60000000 3803ffd0

[1]kdb>

[1]kdb> go
Catastrophic error detected
kdb_continue_catastrophic=0, type go a second time if you really want to continue
[1]kdb> go
Catastrophic error detected
kdb_continue_catastrophic=0, attempting to continue
Oops: Kernel access of bad area, sig: 11 [#1]
PREEMPT SMP NR_CPUS=4 LTT NESTING LEVEL : 0
P2041 RDB
last sysfs file: /sys/devices/system/cpu/cpu3/crash_notes
Modules linked in:
NIP: c0348f64 LR: c034974c CTR: c0348f50
REGS: db18ddc0 TRAP: 0300   Not tainted  (2.6.34.15-grsec-WR4.3.0.0_cgl)
MSR: 00021202 <ME,CE,DE>  CR: 20242444  XER: 00000000
DEAR: 00000000, ESR: 00800000
TASK = db17f900[822] 'sh' THREAD: db18c000 CPU: 1
GPR00: 00000001 db18de70 db17f900 00000063 00000000 ffffffff c035e930 00000000
GPR08: 00008000 00000000 00000054 118c6000 20242444 100b84b8 100b0828 100b0904
GPR16: 00000000 00000000 00000000 1006d2d0 00000000 100cc220 1006b530 00000000
GPR24: 00000001 c0780d24 00029202 c0780e08 c0770000 00000000 c08578a4 00000063
NIP [c0348f64] sysrq_handle_crash+0x14/0x20
LR [c034974c] __handle_sysrq+0xcc/0x1d0
Call Trace:
[db18de70] [c0349734] __handle_sysrq+0xb4/0x1d0 (unreliable)
[db18dea0] [c03498ac] write_sysrq_trigger+0x5c/0x70
[db18deb0] [c01662f0] proc_reg_write+0x80/0xc0
[db18dee0] [c010ec50] vfs_write+0xc0/0x170
[db18df00] [c010ee80] sys_write+0x50/0x110
[db18df40] [c0011d58] ret_from_syscall+0x0/0x4
--- Exception: c01 at 0xff16ba4
    LR = 0xfebad5c
Instruction dump:
39600003 7d605f9e 556b103a 7c005b78 98090003 4e800020 60000000 38000001
3d20c07a 90092170 7c0004ac 39200000 <98090000> 4e800020 60000000 3803ffd0
Sending IPI to other cpus...
Bye!
Using P2041 RDB machine description

......
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Best Regards,
James

Liu Jianbo | WIND RIVER | Senior Engineer - Technical Support
Tel 86 28 65318098 | Cell 86 13558641588 | Fax 86 28 65319983

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