Re: [BUG] 2.6.25-rc2-git4 - Regression Kernel oops while runningkernbench and tbench on powerpc

From: Paul Mackerras
Date: Tue Apr 08 2008 - 08:54:13 EST


Kamalesh Babulal writes:

> The kernel oops after applying the patch. Some time it takes more than
> one run to reproduce it, it was reproducible in the second run this
> time.
>
> Unrecoverable exception 4100 at c000000000008c8c
> Oops: Unrecoverable exception, sig: 6 [#1]
> SMP NR_CPUS=128 NUMA pSeries
> Modules linked in:
> NIP: c000000000008c8c LR: 000000000ff0135c CTR: 000000000ff012f0
> REGS: c000000772343bb0 TRAP: 4100 Not tainted (2.6.25-rc8-autotest)
> MSR: 8000000000001030 <ME,IR,DR> CR: 44044228 XER: 00000000
> TASK = c00000077cfa0900[13437] 'cc1' THREAD: c000000772340000 CPU: 2
> GPR00: 0000000000004000 c000000772343e30 00000000000000bb 000000000000d032
> GPR04: 00000000000000bb 0000000000000400 000000000000000a 0000000000000002
> GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR12: 0000000000000000 c000000000734000 0000000000000064 00000000ffe6df08
> GPR16: 00000000105b0000 00000000105b0000 0000000010440000 00000000105b0000
> GPR20: 00000000ffe6e008 00000000105b0000 00000000105b0000 000000000000000a
> GPR24: 000000000ffec408 0000000000000001 00000000ffe6ddca 0000000000000400
> GPR28: 000000000ffec408 00000000f7ff8000 000000000ffebff4 0000000000000400
> NIP [c000000000008c8c] restore+0x8c/0xc0
> LR [000000000ff0135c] 0xff0135c
> Call Trace:
> [c000000772343e30] [c000000000008cd4] do_work+0x14/0x2c (unreliable)
> Instruction dump:
> 7c840078 7c810164 70604000 41820028 60000000 7c4c42e6 e88d01f0 f84d01f0
> 7c841050 e84d01e8 7c422214 f84d01e8 <e9a100d8> 7c7b03a6 e84101a0 7c4ff120
>
> (gdb) l *0xc000000000008cdc
> 0xc000000000008cdc is at arch/powerpc/kernel/entry_64.S:608.
> 603 mtmsrd r10,1
> 604
> 605 andi. r0,r4,_TIF_NEED_RESCHED
> 606 beq 1f
> 607 bl .schedule
> 608 b .ret_from_except_lite
> 609
> 610 1: bl .save_nvgprs
> 611 li r3,0
> 612 addi r4,r1,STACK_FRAME_OVERHEAD

The exception happened at c...8c8c but you looked at c...8cdc with
gdb. What's at c...8c8c?

> please let me know if you need more information.

The .config would be useful, but don't spam everyone on cc with it,
just send it to me privately.

Paul.
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