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SubjectRe: 2.6.20-rc1-mm1
On Mon, 18 Dec 2006 16:29:02 -0800
Randy Dunlap <randy.dunlap@oracle.com> wrote:

> On Thu, 14 Dec 2006 22:59:13 -0800 Andrew Morton wrote:
>
> Got this on booting up on x86_64 test box.
> Didn't happen on next boot.
>
>
> BUG: scheduling while atomic: hald-addon-stor/0x20000000/3300
>
> Call Trace:
> [<ffffffff8020ac30>] show_trace+0x34/0x47
> [<ffffffff8020ac55>] dump_stack+0x12/0x17
> [<ffffffff8050c2dd>] __sched_text_start+0x5d/0x7ba
> [<ffffffff8022b3f0>] __cond_resched+0x1c/0x44
> [<ffffffff8050cb4d>] cond_resched+0x29/0x30
> [<ffffffff8050e7aa>] __reacquire_kernel_lock+0x26/0x44
> [<ffffffff8050cae6>] thread_return+0xac/0xea
> [<ffffffff8022b3f0>] __cond_resched+0x1c/0x44
> [<ffffffff8050cb4d>] cond_resched+0x29/0x30
> [<ffffffff8050cb83>] wait_for_completion+0x17/0xd2
> [<ffffffff80337a19>] blk_execute_rq+0x98/0xb8
> [<ffffffff80413e7b>] scsi_execute+0xd4/0xf1
> [<ffffffff80413f51>] scsi_execute_req+0xb9/0xde
> [<ffffffff80413faf>] scsi_test_unit_ready+0x39/0x75
> [<ffffffff804443cd>] sd_media_changed+0x40/0x87
> [<ffffffff8029cde0>] check_disk_change+0x1f/0x76
> [<ffffffff8044417e>] sd_open+0x80/0x113
> [<ffffffff8029d4c4>] do_open+0x9f/0x2a7
> [<ffffffff8029d8bc>] blkdev_open+0x2e/0x5d
> [<ffffffff8027afeb>] __dentry_open+0xd9/0x1a7
> [<ffffffff8027b16a>] do_filp_open+0x2a/0x38
> [<ffffffff8027b1bc>] do_sys_open+0x44/0xc8
> [<ffffffff8020956e>] system_call+0x7e/0x83

Bit 29 of current->preempt_count got set. I don't think there's any way in
which that can happen normally. So probably some hardware or software
error reached out and flipped that bit.
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