Re: [bug, 2.6.26-rc4/rc5] sporadic bootup crashes in blk_lookup_devt()/prepare_namespace()

[Vegard Nossum]

On Mon, Jun 9, 2008 at 11:06 AM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, 9 Jun 2008 10:03:12 +0200 Ingo Molnar <mingo@xxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/