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Message-ID: <19f34abd0806090209l541d93c6jaba2704314b34418@mail.gmail.com>
Date: Mon, 9 Jun 2008 11:09:07 +0200
From: "Vegard Nossum" <vegard.nossum@gmail.com>
To: "Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [bug, 2.6.26-rc4/rc5] sporadic bootup crashes in blk_lookup_devt()/prepare_namespace()
Cc: "Ingo Molnar" <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       "Jens Axboe" <jens.axboe@oracle.com>,
       "Greg Kroah-Hartman" <gregkh@suse.de>,
       "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>
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	 <20080609020623.b6727f2b.akpm@linux-foundation.org>
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On Mon, Jun 9, 2008 at 11:06 AM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Mon, 9 Jun 2008 10:03:12 +0200 Ingo Molnar <mingo@elte.hu> wrote:
>
>> -tip testing has started triggering a new type of sporadic bootup crash
>> a few days ago. Find below a collection of 14 crashes i've managed to
>> capture so far, which are all similar to this crash pattern:
>>
>>  BUG: unable to handle kernel paging request at ffff81003b984fb8
>>  IP: [<ffffffff803fafd4>] blk_lookup_devt+0x42/0xa0
>>  PGD 8063 PUD 9063 PMD 3be2d163 PTE 800000003b984160
>>  Oops: 0000 [1] SMP DEBUG_PAGEALLOC
>>
>>  Call Trace:
>>   [<ffffffff80bac17b>] ? ip_auto_config+0x0/0xd94
>>   [<ffffffff80209259>] name_to_dev_t+0x145/0xeec
>>   [<ffffffff803ff2be>] ? __next_cpu_nr+0x22/0x2b
>>   [<ffffffff80b7f372>] prepare_namespace+0x91/0x14c
>>   [<ffffffff80b7eb70>] kernel_init+0x2fe/0x314
>>   [<ffffffff80251f3d>] ? trace_hardirqs_on_caller+0xca/0xee
>>   [<ffffffff80741bbb>] ? trace_hardirqs_on_thunk+0x3a/0x3f
>>   [<ffffffff80251f3d>] ? trace_hardirqs_on_caller+0xca/0xee
>>   [<ffffffff8020d3f8>] child_rip+0xa/0x12
>>   [<ffffffff8020c90c>] ? restore_args+0x0/0x30
>>   [<ffffffff8025068d>] ? trace_hardirqs_off+0xd/0xf
>>   [<ffffffff80b7e872>] ? kernel_init+0x0/0x314
>>   [<ffffffff8020d3ee>] ? child_rip+0x0/0x12
>
> Did you work out where it's dying?  Deref of `dev' I assume?

                        struct gendisk *disk = dev_to_disk(dev);


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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