Re: blk-mq oops with today's Linus' kernel

[Jens Axboe]

On 12/15/2014 08:20 AM, Jens Axboe wrote:
> On 12/15/2014 08:19 AM, Jan Kara wrote:
> >    Hello,
> >
> >    when running xfstests with today's Linus' kernel I've got the
> > following
> > oops:
> > BUG: unable to handle kernel paging request at 0000001000000a28
> > IP: [<ffffffff810ad9f3>] autoremove_wake_function+0x23/0x40
> > PGD 7f566067 PUD 0
> > Oops: 0002 [#1] SMP
> > Modules linked in: ext4 jbd2 crc16 netconsole loop raid6_pq
> > zlib_deflate lzo_compress xor
> > CPU: 4 PID: 0 Comm: swapper/4 Not tainted 3.18.0-xen+ #19
> > Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
> > task: ffff88007e8fa310 ti: ffff88007e900000 task.ti: ffff88007e900000
> > RIP: 0010:[<ffffffff810ad9f3>]  [<ffffffff810ad9f3>]
> > autoremove_wake_function+0x23/0x40
> > RSP: 0018:ffff88007f103d78  EFLAGS: 00010002
> > RAX: 0000000000000000 RBX: ffff88005140f948 RCX: ffff88005140f960
> > RDX: 0000001000000a20 RSI: 0000000000000001 RDI: ffffffff813c2e1f
> > RBP: ffff88007f103d88 R08: 0000000000000001 R09: 0000000000000000
> > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
> > R13: 0000000000000001 R14: ffff88007a3bd640 R15: 0000000000000000
> > FS:  00007ff3b5dc8700(0000) GS:ffff88007f100000(0000)
> > knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > CR2: 0000001000000a28 CR3: 000000007a580000 CR4: 00000000000006e0
> > Stack:
> >   ffff880000000000 ffff88007a3bd628 ffff88007f103dc8 ffffffff810ad8d2
> >   0000000300000000 ffff88007a3bd608 0000000000000000 0000000000000001
> >   0000000000000082 0000000000000003 ffff88007f103e08 ffffffff810adf73
> > Call Trace:
> >   <IRQ>
> >   [<ffffffff810ad8d2>] __wake_up_common+0x52/0x80
> >   [<ffffffff810adf73>] __wake_up+0x43/0x70
> >   [<ffffffff8121d94e>] bt_clear_tag+0xae/0xc0
> >   [<ffffffff8121d98b>] blk_mq_put_tag+0x2b/0x50
> >   [<ffffffff8121ab10>] __blk_mq_free_request+0x40/0xc0
> >   [<ffffffff8121abc1>] blk_mq_free_hctx_request+0x31/0x40
> >   [<ffffffff8121abff>] blk_mq_free_request+0x2f/0x40
> >   [<ffffffff8121b047>] blk_mq_end_request+0x57/0x60
> >   [<ffffffff81214f73>] blk_flush_complete_seq+0x293/0x2d0
> >   [<ffffffff81215373>] flush_end_io+0x113/0x210
> >   [<ffffffff8121b029>] blk_mq_end_request+0x39/0x60
> >   [<ffffffff812d3f46>] virtblk_request_done+0x36/0x80
> >   [<ffffffff81219d1e>] __blk_mq_complete_request_remote+0xe/0x10
> >   [<ffffffff810e1d82>]
> > generic_smp_call_function_single_interrupt+0x72/0x120
> >   [<ffffffff810657d2>] smp_call_function_single_interrupt+0x22/0x30
> >   [<ffffffff813c4462>] call_function_single_interrupt+0x72/0x80
> >   <EOI>
> >   [<ffffffff8106e606>] ? native_safe_halt+0x6/0x10
> >   [<ffffffff810b65bd>] ? trace_hardirqs_on+0xd/0x10
> >   [<ffffffff8104520e>] default_idle+0xe/0x20
> >   [<ffffffff8104509a>] arch_cpu_idle+0xa/0x10
> >   [<ffffffff810ae64f>] cpu_startup_entry+0x2af/0x310
> >   [<ffffffff81066c8d>] start_secondary+0x15d/0x180
> > Code: 64 4a ff ff c9 c3 66 90 55 48 89 e5 53 48 89 fb 48 83
> > ec 08 e8 4f 4a ff ff 85 c0 89 c6 74 1b 48 8b 53 18 48 8b 43 20 48 8d
> > 4b 18
> > <48> 89 42 08 48 89 10 48 89 4b 18 48 89 4b 20 48 83 c4 08 89 f0
> > RIP  [<ffffffff810ad9f3>] autoremove_wake_function+0x23/0x40
> >   RSP <ffff88007f103d78>
> > CR2: 0000001000000a28
> > ---[ end trace d4dc64619e0b4713 ]---
>
> Is this easily reproducible? If so, could you try and revert
> 52f7eb945f2ba62b324bb9ae16d945326a961dcf and see if that helps?

Re-checking that patch, it is broken. Reverting that should fix it up 
for you, I'll send that in in a bit...

--
Jens Axboe

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