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Subjectnext-20130117 - kernel BUG with aio
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Am seeing a reproducible BUG in the kernel with next-20130117
whenever I fire up VirtualBox. Unfortunately, I hadn't done that
in a while, so the last 'known good' kernel was next-20121203.

I'm strongly suspecting one of Kent Overstreet's 32 patches against aio,
because 'git blame' shows those landing on Jan 12, and not much else
happening to fs/aio.c in ages.

The stack traceback ring any bells before I go to bisect this?

[ 327.375581] BUG: sleeping function called from invalid context at arch/x86/mm/fault.c:1138
[ 327.375588] in_atomic(): 0, irqs_disabled(): 1, pid: 2096, name: AioMgr0-N
[ 327.375590] INFO: lockdep is turned off.
[ 327.375593] irq event stamp: 0
[ 327.375595] hardirqs last enabled at (0): [< (null)>] (null)
[ 327.375599] hardirqs last disabled at (0): [<ffffffff8102d9eb>] copy_process.part.40+0x565/0x14be
[ 327.375607] softirqs last enabled at (0): [<ffffffff8102d9eb>] copy_process.part.40+0x565/0x14be
[ 327.375611] softirqs last disabled at (0): [< (null)>] (null)
[ 327.375616] Pid: 2096, comm: AioMgr0-N Tainted: P O 3.8.0-rc3-next-20130117-dirty #49
[ 327.375618] Call Trace:
[ 327.375624] [<ffffffff810770ba>] ? print_irqtrace_events+0x9d/0xa1
[ 327.375630] [<ffffffff8105a576>] __might_sleep+0x19f/0x1a7
[ 327.375635] [<ffffffff81617ab4>] __do_page_fault+0x2a4/0x57c
[ 327.375641] [<ffffffff810dbb55>] ? invalidate_inode_pages2_range+0x2e0/0x2f8
[ 327.375645] [<ffffffff811843f4>] ? ext4_direct_IO+0x224/0x3c2
[ 327.375650] [<ffffffff81186438>] ? noalloc_get_block_write+0x57/0x57
[ 327.375654] [<ffffffff81182c4d>] ? ext4_readpages+0x41/0x41
[ 327.375659] [<ffffffff810b7caf>] ? time_hardirqs_off+0x1b/0x2f
[ 327.375663] [<ffffffff81615373>] ? error_sti+0x5/0x6
[ 327.375667] [<ffffffff8107522f>] ? trace_hardirqs_off_caller+0x1f/0x9e
[ 327.375672] [<ffffffff8124ad2d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 327.375676] [<ffffffff81617d95>] do_page_fault+0x9/0xb
[ 327.375680] [<ffffffff81615182>] page_fault+0x22/0x30
[ 327.375685] [<ffffffff811522af>] ? kioctx_ring_unlock+0xd/0x5f
[ 327.375689] [<ffffffff811524c7>] batch_complete_aio+0x1c6/0x212
[ 327.375694] [<ffffffff8117fc63>] ? ext4_unwritten_wait+0x98/0x98
[ 327.375697] [<ffffffff81152b3a>] aio_complete_batch+0x125/0x132
[ 327.375702] [<ffffffff8117fc63>] ? ext4_unwritten_wait+0x98/0x98
[ 327.375705] [<ffffffff81153931>] do_io_submit+0x781/0x84b
[ 327.375710] [<ffffffff81153a06>] sys_io_submit+0xb/0xd
[ 327.375715] [<ffffffff8161b0d2>] system_call_fastpath+0x16/0x1b

(and that BUG cascades into a second one:

[ 327.375724] BUG: unable to handle kernel NULL pointer dereference at 0000000000000250
[ 327.375729] IP: [<ffffffff811522af>] kioctx_ring_unlock+0xd/0x5f
[ 327.375733] PGD d0d36067 PUD da749067 PMD 0
[ 327.375740] Oops: 0002 [#1] PREEMPT SMP
...
[ 327.375829] Call Trace:
[ 327.375833] [<ffffffff811524c7>] batch_complete_aio+0x1c6/0x212
[ 327.375838] [<ffffffff8117fc63>] ? ext4_unwritten_wait+0x98/0x98
[ 327.375842] [<ffffffff81152b3a>] aio_complete_batch+0x125/0x132
[ 327.375846] [<ffffffff8117fc63>] ? ext4_unwritten_wait+0x98/0x98
[ 327.375850] [<ffffffff81153931>] do_io_submit+0x781/0x84b
[ 327.375855] [<ffffffff81153a06>] sys_io_submit+0xb/0xd
[ 327.375859] [<ffffffff8161b0d2>] system_call_fastpath+0x16/0x1b
[ 327.375861] Code: 00 50 48 8d 5f 90 48 81 c7 98 01 00 00 e8 0e 9c f0 ff 48 89 df e8 87 fd ff ff 58 5b 5d c3 55 48 89 e5 41 54 41 89 f4 53
48 89 fb <89> b3 50 02 00 00 48 8b 47 50 48 8b 38 e8 37 f9 ff ff 44 89 60
[ 327.375937] RIP [<ffffffff811522af>] kioctx_ring_unlock+0xd/0x5f
[ 327.375942] RSP <ffff8800b8965db8>
[ 327.375944] CR2: 0000000000000250
[ 327.375949] ---[ end trace b119850056dcfba4 ]---

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