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Date: Sun, 20 Nov 2011 15:31:38 -0800 (PST)
From: Christian Kujau <lists@nerdbynature.de>
To: LKML <linux-kernel@vger.kernel.org>
cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: 3.2.0-rc1 panic on PowerPC
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On Tue, 15 Nov 2011 at 00:44, Christian Kujau wrote:
> I noticed a few crashes on this PowerBook G4 lately, starting somewhere in 
> 3.2.0-rc1. The crashes are really rare and as I'm not on the system all 
> the time I did not notice most of them. By the time I did, the screen was 
> blank already and I had to hard-reset the box. But not this time:
> 
>   http://nerdbynature.de/bits/3.2.0-rc1/oops/
> 
> When the crash occured, the system was failry loaded (CPU and disk I/O 
> wise), so that may have triggered it. I tried to type off the stack trace, 
> I hope there are not too many typos, see below.
> 
> The machine is fairly old, so maybe it's "just" bad RAM or something, I 
> wouldn't be suprised. But maybe not, the box us pretty stable most of the 
> time and only now I notice these rare crashes.

Happened again with 3.2.0-rc2-00027-gff0ff78, this time with netconsole 
enabled. But this time the machine just stopped, w/o any output on the 
screen or on netconsole :(

Christian.

> If anyone could take a quick look...?
> 
> Thank you,
> Christian.
> 
> Instruction dump:
> 92c40008 68000001 0f000000 80040000 5400003c 90040000 817f000c 380bffff
> 901f000c 2f090000 81640018 81440014 <916a0004> 914b0000 92840014 92a49918
> Kernel panic - not syncing: Fatal exception in interrupt
> Call Trace:
> show_stack+0x70/0x1bc (unreliable)
> panic+0xc8/0x220
> die+0x2ac/0x2b8
> bad_page_fault+0xbc/0x104
> handle_page_fault+0x7c/0x80
> Exception: 300 at T.975+0x3f4/0x570
> LR = T.957+0x300/0x570
> kmem_cache_alloc+0x150/0x150
> __aloc_skb+0x50/0x148
> tcp_send_ack+0x35/0x138
> tcp_delay_timer+0x140/0x244
> run_timer_softirq+0x1a0/0x2ec
> __do_softirq+0xf4/0x1bc
> call_do_softirq+0x14/0x24
> do_softirq+0xfc/0x128
> irq_exit+0xa0/0xa4
> timer_interrupt+0x148/0x180
> ret_from_except+0x0/0x14
> cpu_idle+0xa0/0x118
> rest_init+0xf0/0x114
> start_kernel+0x2d0/0x2f0
> 0x3444
> Rebooting in 180 seconds..
> 
> -- 
> BOFH excuse #184:
> 
> loop found in loop in redundant loopback
> --
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-- 
BOFH excuse #387:

Your computer's union contract is set to expire at midnight.