linux-kernel - Re: [BUG] 2.6.25-rc2-git4 - Regression Kernel oops while running kernbench and tbench on powerpc

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Date:	Tue, 8 Apr 2008 22:53:52 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	kernel list <linux-kernel@...r.kernel.org>,
	linux-next@...r.kernel.org, linuxppc-dev@...abs.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, nacc@...ibm.com
Subject: Re: [BUG] 2.6.25-rc2-git4 - Regression Kernel oops  while running
 kernbench and tbench on powerpc

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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