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Message-ID: <CACVXFVMzQ8TkxsiUujUZR0E=0Lx=BtZ2BsLmhCTHk8D9dr8rag@mail.gmail.com>
Date: Tue, 9 Dec 2014 08:41:02 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Jens Axboe <axboe@...com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH] blk-mq: prevent unmapped hw queue from being scheduled
On Wed, Dec 3, 2014 at 7:38 PM, Ming Lei <ming.lei@...onical.com> wrote:
> When one hardware queue has no mapped software queues, it
> shouldn't have been scheduled. Otherwise WARNING or OOPS
> can triggered.
>
> blk_mq_hw_queue_mapped() helper is introduce for fixing
> the problem.
>
> Signed-off-by: Ming Lei <ming.lei@...onical.com>
> ---
> block/blk-mq.c | 8 ++++++--
> block/blk-mq.h | 5 +++++
> 2 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/block/blk-mq.c b/block/blk-mq.c
> index c95abc6..c916ad0 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -599,7 +599,7 @@ static void blk_mq_rq_timer(unsigned long priv)
> * If not software queues are currently mapped to this
> * hardware queue, there's nothing to check
> */
> - if (!hctx->nr_ctx || !hctx->tags)
> + if (!blk_mq_hw_queue_mapped(hctx))
> continue;
>
> blk_mq_tag_busy_iter(hctx, blk_mq_check_expired, &data);
> @@ -819,7 +819,8 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx)
>
> void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
> {
> - if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state)))
> + if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state) ||
> + !blk_mq_hw_queue_mapped(hctx)))
> return;
>
> if (!async) {
> @@ -926,6 +927,9 @@ static void blk_mq_delay_work_fn(struct work_struct *work)
>
> void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs)
> {
> + if (unlikely(!blk_mq_hw_queue_mapped(hctx)))
> + return;
> +
> kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx),
> &hctx->delay_work, msecs_to_jiffies(msecs));
> }
> diff --git a/block/blk-mq.h b/block/blk-mq.h
> index d567d52..206230e 100644
> --- a/block/blk-mq.h
> +++ b/block/blk-mq.h
> @@ -115,4 +115,9 @@ static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
> data->hctx = hctx;
> }
>
> +static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
> +{
> + return hctx->nr_ctx && hctx->tags;
> +}
> +
> #endif
Gentle ping...
Without the change, it is easy to trigger following warning/oops in
my virtio-scsi test.
[ 124.286891] ------------[ cut here ]------------
[ 124.288310] WARNING: CPU: 0 PID: 522 at block/blk-mq.c:705
__blk_mq_run_hw_queue+0x69/0x315()
[ 124.290219] Modules linked in: ipv6 serio_raw
[ 124.291338] CPU: 0 PID: 522 Comm: kworker/0:1H Tainted: G W
3.18.0-rc6-next-20141201 #57
[ 124.293335] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 124.295116] Workqueue: kblockd blk_mq_run_work_fn
[ 124.296031] 00000000000002c1 ffff880016bf7c28 ffffffff814992ac
0000000080000000
[ 124.297487] 0000000000000000 ffff880016bf7c68 ffffffff81044cb9
ffff880016bf7c58
[ 124.298971] ffffffff81237fd6 ffff88001cb7ec00 ffff88001d09e4c0
ffff88001cb7e400
[ 124.300439] Call Trace:
[ 124.300900] [<ffffffff814992ac>] dump_stack+0x4f/0x7b
[ 124.301876] [<ffffffff81044cb9>] warn_slowpath_common+0xa1/0xbb
[ 124.303008] [<ffffffff81237fd6>] ? __blk_mq_run_hw_queue+0x69/0x315
[ 124.304229] [<ffffffff81044ced>] warn_slowpath_null+0x1a/0x1c
[ 124.305303] [<ffffffff81237fd6>] __blk_mq_run_hw_queue+0x69/0x315
[ 124.306456] [<ffffffff8108119c>] ? __lock_is_held+0x31/0x52
[ 124.307543] [<ffffffff812382bb>] blk_mq_run_work_fn+0x15/0x17
[ 124.308631] [<ffffffff8105adc9>] process_one_work+0x282/0x468
[ 124.309730] [<ffffffff8105ac94>] ? process_one_work+0x14d/0x468
[ 124.310831] [<ffffffff8105b22e>] worker_thread+0x250/0x2b5
[ 124.311881] [<ffffffff8105afde>] ? process_scheduled_works+0x2f/0x2f
[ 124.313066] [<ffffffff8105fc59>] kthread+0xba/0xc2
[ 124.313965] [<ffffffff8106567e>] ? finish_task_switch+0x5d/0x122
[ 124.315114] [<ffffffff81069227>] ? preempt_count_sub+0xc4/0xd1
[ 124.316200] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 124.317376] [<ffffffff814a016c>] ret_from_fork+0x7c/0xb0
[ 124.318392] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 124.319943] ---[ end trace 3119f396c663862f ]---
[ 133.865477] EXT4-fs (sda): mounted filesystem with ordered data
mode. Opts: (null)
[ 181.990071] random: nonblocking pool is initialized
[ 184.301383] BUG: unable to handle kernel paging request at ffffffff81d52400
[ 184.302085] IP: [<ffffffff8105a2ed>] __queue_work+0xec/0x2be
[ 184.302085] PGD 1a12067 PUD 1a13063 PMD 8000000001c00062
[ 184.302085] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 184.302085] Dumping ftrace buffer:
[ 184.302085] (ftrace buffer empty)
[ 184.302085] Modules linked in: ipv6 serio_raw
[ 184.302085] CPU: 0 PID: 522 Comm: kworker/0:1H Tainted: G W
3.18.0-rc6-next-20141201 #57
[ 184.302085] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 184.302085] Workqueue: kblockd blk_mq_requeue_work
[ 184.302085] task: ffff88001610d180 ti: ffff880016bf4000 task.ti:
ffff880016bf4000
[ 184.302085] RIP: 0010:[<ffffffff8105a2ed>] [<ffffffff8105a2ed>]
__queue_work+0xec/0x2be
[ 184.302085] RSP: 0018:ffff880016bf7bd8 EFLAGS: 00010086
[ 184.302085] RAX: ffff88001fbd2ec0 RBX: ffffffff81d52400 RCX: 0000000000000000
[ 184.302085] RDX: 0000000000000000 RSI: ffffffff821cc970 RDI: ffffffff81a4fad0
[ 184.302085] RBP: ffff880016bf7c18 R08: ffffffff821cc970 R09: ffffffff821cc970
[ 184.302085] R10: ffffffff821cc970 R11: ffff88000000006c R12: ffff88001cb7ec88
[ 184.302085] R13: 0000000000000001 R14: ffff88001e420400 R15: 0000000000000001
[ 184.302085] FS: 0000000000000000(0000) GS:ffff88001fa00000(0000)
knlGS:0000000000000000
[ 184.302085] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 184.302085] CR2: ffffffff81d52400 CR3: 000000001999b000 CR4: 00000000000006f0
[ 184.302085] Stack:
[ 184.302085] ffff88001d09e4c0 ffff88001d30e000 ffff88001cb7f448
0000000000000001
[ 184.302085] ffff88001e420400 ffff88001cb7ec88 0000000000000001
0000000000000000
[ 184.302085] ffff880016bf7c58 ffffffff8105a5dc 0000000000000002
0000000000000282
[ 184.302085] Call Trace:
[ 184.302085] [<ffffffff8105a5dc>] __queue_delayed_work+0xb5/0x114
[ 184.302085] [<ffffffff8105a966>] queue_delayed_work_on+0x54/0x77
[ 184.302085] [<ffffffff8122cb02>] kblockd_schedule_delayed_work_on+0x1b/0x20
[ 184.302085] [<ffffffff8123891a>] blk_mq_run_hw_queue+0xd5/0xda
[ 184.302085] [<ffffffff81238f8f>] blk_mq_start_hw_queue+0x18/0x1a
[ 184.302085] [<ffffffff81238fc2>] blk_mq_start_hw_queues+0x31/0x38
[ 184.302085] [<ffffffff81239c95>] blk_mq_requeue_work+0xc5/0xd1
[ 184.302085] [<ffffffff8105adc9>] process_one_work+0x282/0x468
[ 184.302085] [<ffffffff8105ac94>] ? process_one_work+0x14d/0x468
[ 184.302085] [<ffffffff8105b22e>] worker_thread+0x250/0x2b5
[ 184.302085] [<ffffffff8105afde>] ? process_scheduled_works+0x2f/0x2f
[ 184.302085] [<ffffffff8105fc59>] kthread+0xba/0xc2
[ 184.302085] [<ffffffff8106567e>] ? finish_task_switch+0x5d/0x122
[ 184.302085] [<ffffffff81069227>] ? preempt_count_sub+0xc4/0xd1
[ 184.302085] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 184.302085] [<ffffffff814a016c>] ret_from_fork+0x7c/0xb0
[ 184.302085] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 184.302085] Code: 03 1c c5 d0 bb b5 81 eb 15 44 89 ff e8 89 4d fe
ff 4c 89 f7 89 c6 e8 9e fe ff ff 48 89 c3 4c 89 e7 e8 33 fb ff ff 48
85 c0 74 3b <48> 3b 03 74 36 48 89 c7 48 89 45 c8 e8 55 50 44 00 48 8b
55 c8
[ 184.302085] RIP [<ffffffff8105a2ed>] __queue_work+0xec/0x2be
[ 184.302085] RSP <ffff880016bf7bd8>
[ 184.302085] CR2: ffffffff81d52400
[ 184.302085] ---[ end trace 3119f396c6638630 ]---
[ 184.360165] BUG: unable to handle kernel paging request at ffffffffffffff98
[ 184.361025] IP: [<ffffffff81060371>] kthread_data+0x10/0x16
[ 184.361025] PGD 1a12067 PUD 1a14067 PMD 0
[ 184.361025] Oops: 0000 [#2] PREEMPT SMP DEBUG_PAGEALLOC
[ 184.361025] Dumping ftrace buffer:
[ 184.361025] (ftrace buffer empty)
[ 184.361025] Modules linked in: ipv6 serio_raw
[ 184.361025] CPU: 0 PID: 522 Comm: kworker/0:1H Tainted: G D W
3.18.0-rc6-next-20141201 #57
[ 184.361025] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 184.361025] task: ffff88001610d180 ti: ffff880016bf4000 task.ti:
ffff880016bf4000
[ 184.361025] RIP: 0010:[<ffffffff81060371>] [<ffffffff81060371>]
kthread_data+0x10/0x16
[ 184.361025] RSP: 0000:ffff880016bf77b8 EFLAGS: 00010046
[ 184.361025] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88001fbd3538
[ 184.361025] RDX: 0000000000000006 RSI: 0000000000000000 RDI: ffff88001610d180
[ 184.361025] RBP: ffff880016bf77b8 R08: ffffffff81f62ec0 R09: 000000000000b8cb
[ 184.361025] R10: ffff88001610d180 R11: ffff88001fbd3480 R12: 0000000000000000
[ 184.361025] R13: 0000000000000000 R14: ffff88001610d180 R15: 0000000000000001
[ 184.361025] FS: 0000000000000000(0000) GS:ffff88001fa00000(0000)
knlGS:0000000000000000
[ 184.361025] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 184.361025] CR2: 0000000000000028 CR3: 0000000019970000 CR4: 00000000000006f0
[ 184.361025] Stack:
[ 184.361025] ffff880016bf77e8 ffffffff8105bc3f ffff88001fbd3480
ffff88001fbd3480
[ 184.361025] 0000000000000000 0000000000000040 ffff880016bf7858
ffffffff8149b3c1
[ 184.361025] ffff880016bf7848 ffff880016bf4000 ffff88001610d180
00000000001d3480
[ 184.361025] Call Trace:
[ 184.361025] [<ffffffff8105bc3f>] wq_worker_sleeping+0x19/0x9e
[ 184.361025] [<ffffffff8149b3c1>] __schedule+0x1f9/0x696
[ 184.361025] [<ffffffff8149b9bb>] schedule+0x69/0x6b
[ 184.361025] [<ffffffff81047ab8>] do_exit+0x9ec/0x9ee
[ 184.361025] [<ffffffff81005f93>] oops_end+0xb2/0xba
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494cca>] no_context+0x317/0x345
[ 184.361025] [<ffffffff812de375>] ? virtqueue_add_sgs+0x7d/0x8c
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494ed5>] __bad_area_nosemaphore+0x1dd/0x1fe
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494f09>] bad_area_nosemaphore+0x13/0x15
[ 184.361025] [<ffffffff81038be5>] __do_page_fault+0x3f8/0x438
[ 184.361025] [<ffffffff8149fcd6>] ? _raw_spin_unlock_irqrestore+0x3f/0x60
[ 184.361025] [<ffffffff810806c5>] ? trace_hardirqs_on_caller+0x1c1/0x1e0
[ 184.361025] [<ffffffff812dede6>] ? vp_notify+0x21/0x25
[ 184.361025] [<ffffffff812ddc1a>] ? virtqueue_notify+0x19/0x2b
[ 184.361025] [<ffffffff814a20e3>] ? error_sti+0x5/0x6
[ 184.361025] [<ffffffff8126c80c>] ? __this_cpu_preempt_check+0x13/0x15
[ 184.361025] [<ffffffff8107e735>] ? trace_hardirqs_off_caller+0x131/0x13d
[ 184.361025] [<ffffffff8125788d>] ? trace_hardirqs_off_thunk+0x3a/0x3f
[ 184.361025] [<ffffffff81038c31>] do_page_fault+0xc/0xe
[ 184.361025] [<ffffffff814a1ee2>] page_fault+0x22/0x30
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff8105a2ed>] ? __queue_work+0xec/0x2be
[ 184.361025] [<ffffffff8105a2e8>] ? __queue_work+0xe7/0x2be
[ 184.361025] [<ffffffff8105a5dc>] __queue_delayed_work+0xb5/0x114
[ 184.361025] [<ffffffff8105a966>] queue_delayed_work_on+0x54/0x77
[ 184.361025] [<ffffffff8122cb02>] kblockd_schedule_delayed_work_on+0x1b/0x20
[ 184.361025] [<ffffffff8123891a>] blk_mq_run_hw_queue+0xd5/0xda
[ 184.361025] [<ffffffff81238f8f>] blk_mq_start_hw_queue+0x18/0x1a
[ 184.361025] [<ffffffff81238fc2>] blk_mq_start_hw_queues+0x31/0x38
[ 184.361025] [<ffffffff81239c95>] blk_mq_requeue_work+0xc5/0xd1
[ 184.361025] [<ffffffff8105adc9>] process_one_work+0x282/0x468
[ 184.361025] [<ffffffff8105ac94>] ? process_one_work+0x14d/0x468
[ 184.361025] [<ffffffff8105b22e>] worker_thread+0x250/0x2b5
[ 184.361025] [<ffffffff8105afde>] ? process_scheduled_works+0x2f/0x2f
[ 184.361025] [<ffffffff8105fc59>] kthread+0xba/0xc2
[ 184.361025] [<ffffffff8106567e>] ? finish_task_switch+0x5d/0x122
[ 184.361025] [<ffffffff81069227>] ? preempt_count_sub+0xc4/0xd1
[ 184.361025] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 184.361025] [<ffffffff814a016c>] ret_from_fork+0x7c/0xb0
[ 184.361025] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 184.361025] Code: 40 ab 00 00 48 8b 80 d8 08 00 00 48 89 e5 5d 48
8b 40 88 48 c1 e8 02 83 e0 01 c3 0f 1f 44 00 00 48 8b 87 d8 08 00 00
55 48 89 e5 <48> 8b 40 98 5d c3 0f 1f 44 00 00 55 ba 08 00 00 00 48 89
e5 48
[ 184.361025] RIP [<ffffffff81060371>] kthread_data+0x10/0x16
[ 184.361025] RSP <ffff880016bf77b8>
[ 184.361025] CR2: ffffffffffffff98
[ 184.361025] ---[ end trace 3119f396c6638631 ]---
[ 184.361025] Fixing recursive fault but reboot is needed!
[ 184.361025] BUG: scheduling while atomic: kworker/0:1H/522/0x00000004
[ 184.361025] INFO: lockdep is turned off.
[ 184.361025] Modules linked in: ipv6 serio_raw
[ 184.361025] irq event stamp: 716
[ 184.361025] hardirqs last enabled at (715): [<ffffffff8149fcd6>]
_raw_spin_unlock_irqrestore+0x3f/0x60
[ 184.361025] hardirqs last disabled at (716): [<ffffffff8105a944>]
queue_delayed_work_on+0x32/0x77
[ 184.361025] softirqs last enabled at (416): [<ffffffff81048a59>]
__do_softirq+0x347/0x3a1
[ 184.361025] softirqs last disabled at (411): [<ffffffff81048c93>]
irq_exit+0x40/0x94
[ 184.361025] Preemption disabled at:[<ffffffff81005f93>] oops_end+0xb2/0xba
[ 184.361025]
[ 184.361025] CPU: 0 PID: 522 Comm: kworker/0:1H Tainted: G D W
3.18.0-rc6-next-20141201 #57
[ 184.361025] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 184.361025] 0000000000000000 ffff880016bf73a8 ffffffff814992ac
0000000080000004
[ 184.361025] ffff88001610d180 ffff880016bf73c8 ffffffff8149575d
0000000000000001
[ 184.361025] ffff88001fbd3480 ffff880016bf7438 ffffffff8149b26c
ffffffff81091003
[ 184.361025] Call Trace:
[ 184.361025] [<ffffffff814992ac>] dump_stack+0x4f/0x7b
[ 184.361025] [<ffffffff8149575d>] __schedule_bug+0xb3/0xc3
[ 184.361025] [<ffffffff8149b26c>] __schedule+0xa4/0x696
[ 184.361025] [<ffffffff81091003>] ? kmsg_dump+0x24/0x1aa
[ 184.361025] [<ffffffff8149b9bb>] schedule+0x69/0x6b
[ 184.361025] [<ffffffff810471d3>] do_exit+0x107/0x9ee
[ 184.361025] [<ffffffff81091180>] ? kmsg_dump+0x1a1/0x1aa
[ 184.361025] [<ffffffff81091003>] ? kmsg_dump+0x24/0x1aa
[ 184.361025] [<ffffffff81005f93>] oops_end+0xb2/0xba
[ 184.361025] [<ffffffff81494cca>] no_context+0x317/0x345
[ 184.361025] [<ffffffff8118c72a>] ? fsnotify_clear_marks_by_inode+0x30/0xb7
[ 184.361025] [<ffffffff81494ed5>] __bad_area_nosemaphore+0x1dd/0x1fe
[ 184.361025] [<ffffffff8118c72a>] ? fsnotify_clear_marks_by_inode+0x30/0xb7
[ 184.361025] [<ffffffff81494f09>] bad_area_nosemaphore+0x13/0x15
[ 184.361025] [<ffffffff81038be5>] __do_page_fault+0x3f8/0x438
[ 184.361025] [<ffffffff8109a67c>] ? __call_rcu.constprop.64+0x1ed/0x206
[ 184.361025] [<ffffffff8108051a>] ? trace_hardirqs_on_caller+0x16/0x1e0
[ 184.361025] [<ffffffff8107cd8d>] ? rcu_read_unlock+0x5d/0x5d
[ 184.361025] [<ffffffff810eae88>] ? time_hardirqs_off+0x1b/0x2f
[ 184.361025] [<ffffffff814a20e3>] ? error_sti+0x5/0x6
[ 184.361025] [<ffffffff8107e623>] ? trace_hardirqs_off_caller+0x1f/0x13d
[ 184.361025] [<ffffffff8125788d>] ? trace_hardirqs_off_thunk+0x3a/0x3f
[ 184.361025] [<ffffffff81038c31>] do_page_fault+0xc/0xe
[ 184.361025] [<ffffffff814a1ee2>] page_fault+0x22/0x30
[ 184.361025] [<ffffffff81060371>] ? kthread_data+0x10/0x16
[ 184.361025] [<ffffffff8106777f>] ? dequeue_task+0x66/0x6d
[ 184.361025] [<ffffffff8105bc3f>] wq_worker_sleeping+0x19/0x9e
[ 184.361025] [<ffffffff8149b3c1>] __schedule+0x1f9/0x696
[ 184.361025] [<ffffffff8149b9bb>] schedule+0x69/0x6b
[ 184.361025] [<ffffffff81047ab8>] do_exit+0x9ec/0x9ee
[ 184.361025] [<ffffffff81005f93>] oops_end+0xb2/0xba
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494cca>] no_context+0x317/0x345
[ 184.361025] [<ffffffff812de375>] ? virtqueue_add_sgs+0x7d/0x8c
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494ed5>] __bad_area_nosemaphore+0x1dd/0x1fe
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff81494f09>] bad_area_nosemaphore+0x13/0x15
[ 184.361025] [<ffffffff81038be5>] __do_page_fault+0x3f8/0x438
[ 184.361025] [<ffffffff8149fcd6>] ? _raw_spin_unlock_irqrestore+0x3f/0x60
[ 184.361025] [<ffffffff810806c5>] ? trace_hardirqs_on_caller+0x1c1/0x1e0
[ 184.361025] [<ffffffff812dede6>] ? vp_notify+0x21/0x25
[ 184.361025] [<ffffffff812ddc1a>] ? virtqueue_notify+0x19/0x2b
[ 184.361025] [<ffffffff814a20e3>] ? error_sti+0x5/0x6
[ 184.361025] [<ffffffff8126c80c>] ? __this_cpu_preempt_check+0x13/0x15
[ 184.361025] [<ffffffff8107e735>] ? trace_hardirqs_off_caller+0x131/0x13d
[ 184.361025] [<ffffffff8125788d>] ? trace_hardirqs_off_thunk+0x3a/0x3f
[ 184.361025] [<ffffffff81038c31>] do_page_fault+0xc/0xe
[ 184.361025] [<ffffffff814a1ee2>] page_fault+0x22/0x30
[ 184.361025] [<ffffffff81d52400>] ? do_name+0x112/0x288
[ 184.361025] [<ffffffff8105a2ed>] ? __queue_work+0xec/0x2be
[ 184.361025] [<ffffffff8105a2e8>] ? __queue_work+0xe7/0x2be
[ 184.361025] [<ffffffff8105a5dc>] __queue_delayed_work+0xb5/0x114
[ 184.361025] [<ffffffff8105a966>] queue_delayed_work_on+0x54/0x77
[ 184.361025] [<ffffffff8122cb02>] kblockd_schedule_delayed_work_on+0x1b/0x20
[ 184.361025] [<ffffffff8123891a>] blk_mq_run_hw_queue+0xd5/0xda
[ 184.361025] [<ffffffff81238f8f>] blk_mq_start_hw_queue+0x18/0x1a
[ 184.361025] [<ffffffff81238fc2>] blk_mq_start_hw_queues+0x31/0x38
[ 184.361025] [<ffffffff81239c95>] blk_mq_requeue_work+0xc5/0xd1
[ 184.361025] [<ffffffff8105adc9>] process_one_work+0x282/0x468
[ 184.361025] [<ffffffff8105ac94>] ? process_one_work+0x14d/0x468
[ 184.361025] [<ffffffff8105b22e>] worker_thread+0x250/0x2b5
[ 184.361025] [<ffffffff8105afde>] ? process_scheduled_works+0x2f/0x2f
[ 184.361025] [<ffffffff8105fc59>] kthread+0xba/0xc2
[ 184.361025] [<ffffffff8106567e>] ? finish_task_switch+0x5d/0x122
[ 184.361025] [<ffffffff81069227>] ? preempt_count_sub+0xc4/0xd1
[ 184.361025] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
[ 184.361025] [<ffffffff814a016c>] ret_from_fork+0x7c/0xb0
[ 184.361025] [<ffffffff8105fb9f>] ? __init_kthread_worker+0x5a/0x5a
Thanks,
Ming Lei
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