linux-kernel - Re: smbfs (Re: BUG: soft lockup detected on CPU#0! (2.6.18.2))

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Message-ID: <86odr6f55x.fsf@gere.msconsult.dk>
Date:	Fri, 17 Nov 2006 16:45:30 +0100
From:	rasmus@...onsult.dk (Rasmus Bøg Hansen)
To:	Oleg Verych <olecom@...wer.upol.cz>
Cc:	rasmus@...onsult.dk (Rasmus Bøg Hansen),
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: smbfs (Re: BUG: soft lockup detected on CPU#0! (2.6.18.2))

Oleg Verych <olecom@...wer.upol.cz> writes:

> [ Adding e-mail of Andrew Morton, he may have clue about who to ping ;]
> [ MAINTAINERS.smbfs seems to be emply                                 ]
>
> On 2006-11-14, Rasmus BЬg Hansen wrote:
> []
>> [1.] One line summary of the problem:
>>
>> Kernel BUG's and freezes after a soft lockup.
>>
>> [2.] Full description of the problem/report:
>>
>> The night before sunday, my server froze. It was entirely dead and had
>> to be power cycled. There was no seriel console connected but it
>> managed to log a short BUG before, which seems related to smbfs.
>>
>> As it happened in the night, I am unsure what triggered the bug, but
>> it was during the nightly backup routines, which includes running
>> rsync over ssh (over ADSL so pretty slow) and writing some large
>> .tar.bz2 to a smbfs drive. I assume (but do no know for sure) that it
>> was the last one that triggered the bug.
>
> Nobody seems to picked this up. So.
> Why don't you try debian's kernel 2.6.18 from unstable?

I haven't tried that, partially to get rid of the initrd and have
drivers for the controllers/disks in-kernel, partially because I like
having built my own kernel. That might be silly, of course - I can try
the Debian kernel, if you think it would make a difference.

> I see, you've build it yourself, then try to enable some more locking
> debuging in the "kernel hacking" section.

I am now running with all lock debugging turned on. "Unfortunately"
the machine has been running stable since the crash last weekend -
perhaps the extra-large backup rourines at sunday may trigger it
again...

> (gitweb down, i can't check history of smbfs, and i have amd64 arch, anyway)
>> Nov 12 03:54:57 gere kernel: BUG: soft lockup detected on CPU#0!
>> Nov 12 03:54:57 gere kernel:  [softlockup_tick+170/195] softlockup_tick+0xaa/0xc3
>> Nov 12 03:54:57 gere kernel:  [update_process_times+56/137] update_process_times+0x38/0x89
>> Nov 12 03:54:57 gere kernel:  [smp_apic_timer_interrupt+105/117] smp_apic_timer_interrupt+0x69/0x75
>> Nov 12 03:54:57 gere kernel:  [smbiod+238/348] smbiod+0xee/0x15c
> this
>
>> Nov 12 03:54:57 gere kernel:  [apic_timer_interrupt+31/36] apic_timer_interrupt+0x1f/0x24
>> Nov 12 03:54:57 gere kernel:  [journal_init_revoke+49/678] journal_init_revoke+0x31/0x2a6
>> Nov 12 03:54:57 gere kernel:  [smbiod+238/348] smbiod+0xee/0x15c
> and this *may be* double (un)lock.

Hopefully lock debugging will tell.

Regards
/Rasmus

-- 
Rasmus Bøg Hansen
MSC Aps
Bøgesvinget 8
2740 Skovlunde
44 53 93 66

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