[Crash-utility] crash failed to get backtrace in module on powerpc target(e500v2)

[Liu, Jianbo (James)]

Hi Experts:

I met a issue when try to analysis vmcore which was triggered by a error in module on powerpc target.

BG:
Crash version is 6.1.4, I cross build it with powerpc toolchain, and run it on p2020(e500v2) target directly.


It show the following error:
/*************************************************************************/
crash> bt
PID: 588    TASK: eed6e880  CPU: 1   COMMAND: "insmod"
R0:  c0097cfc   R1:  eed81e80   R2:  eed6e880   R3:  eed81db8
R4:  00021000   R5:  c07955df   R6:  000025d1   R7:  c0793bb0
R8:  00001a2f   R9:  00000000   R10: 00000020   R11: eed80000
R12: 24000044   R13: 100a73a0   R14: 00000000   R15: 00000000
R16: 00000000   R17: 00000000   R18: 00000000   R19: 00000000
R20: 00000000   R21: 00000000   R22: 00000000   R23: 00000000
R24: 00000000   R25: 00000000   R26: 00028b70   R27: f23ea000
R28: 00000000   R29: eed81db8   R30: c0753178   R31: c0790000
NIP: c05c7e9c   MSR: 00021000   OR3: eed81e48   CTR: 00000001
LR:  c05c7e9c   XER: 20000000   CCR: 24000042   MQ:  c0007fdc
DAR: 00000000 DSISR: 00000000        Syscall Result: 00000000
 NIP [00000000c05c7e9c] panic
 LR  [00000000c05c7e9c] panic
 #0 [eed81e80] panic at c05c7e9c
bt: ppc_back_trace hit unknown symbol (f23e70b4).
/*************************************************************************/

I doubt if the crash can not worked well on e500v2 target for the moment?

BTW, In my module, module_init will call a function, that function will call panic and cause kdump, but from the log when issue happen, looks it did not show the right call trace:
/*************************************************************************/
[eed81e80] [c05c7e94] panic+0x12c/0x1ac
[eed81ed0] [f23e70b4] dummy_cleanup_module+0x0/0x44 [dummy]
[eed81ee0] [f23ea030] dummy_init_module+0x30/0x68 [dummy]
[eed81ef0] [c0002124] do_one_initcall+0x3c/0x1e0
[eed81f20] [c008e698] sys_init_module+0xf8/0x21c
/*************************************************************************/
Do you have some comments on this kind of secne?

Thanks a lot for your valuable time!




Best Regards,
James

Liu Jianbo | WIND RIVER | Senior Engineer - Technical Support
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