Messages in this thread | | | Date | Mon, 9 Jun 2008 11:34:46 +0200 | From | Ingo Molnar <> | Subject | Re: [bug, 2.6.26-rc4/rc5] sporadic bootup crashes in blk_lookup_devt()/prepare_namespace() |
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* Vegard Nossum <vegard.nossum@gmail.com> wrote:
> 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);
wild shot in the dark: if i were to finger a random commit in this general code area where it crashed it would be:
| commit 30f2f0eb4bd2c43d10a8b0d872c6e5ad8f31c9a0 | Author: Kay Sievers <kay.sievers@vrfy.org> | Date: Tue May 6 22:31:33 2008 +0200 | | block: do_mounts - accept root=<non-existant partition>
i could try a revert of this commit although given the extremely sporadic nature of this bug i doubt i could do any conclusive testing.
Ingo
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