INFO: task kworker/1:1H:56 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1H    state:D stack:0     pid:56    tgid:56    ppid:2      task_flags:0x4208060 flags:0x00000000
Workqueue: kblockd blk_mq_timeout_work
Call trace: 
[<81a3e1dc>] (__schedule) from [<81a3f170>] (__schedule_loop kernel/sched/core.c:7043 [inline])
[<81a3e1dc>] (__schedule) from [<81a3f170>] (schedule+0x2c/0x130 kernel/sched/core.c:7058)
 r10:833cad70 r9:832e6e05 r8:df945e40 r7:828ef7c0 r6:828ef7c0 r5:0000572c
 r4:83346c00
[<81a3f144>] (schedule) from [<803042b0>] (synchronize_rcu_expedited+0x27c/0x3fc kernel/rcu/tree_exp.h:972)
 r5:0000572c r4:828ef8ec
[<80304034>] (synchronize_rcu_expedited) from [<803046c4>] (synchronize_rcu+0x38/0x44 kernel/rcu/tree.c:3352)
 r8:83346c00 r7:ddde2ee0 r6:832e6e00 r5:83c86000 r4:83c86150
[<8030468c>] (synchronize_rcu) from [<808428b4>] (blk_mq_wait_quiesce_done block/blk-mq.c:285 [inline])
[<8030468c>] (synchronize_rcu) from [<808428b4>] (blk_mq_timeout_work+0x1c8/0x1d0 block/blk-mq.c:1742)
[<808426ec>] (blk_mq_timeout_work) from [<8027a398>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3236)
 r5:83c86150 r4:8382dc80
[<8027a1e4>] (process_one_work) from [<8027afe0>] (process_scheduled_works kernel/workqueue.c:3319 [inline])
[<8027a1e4>] (process_one_work) from [<8027afe0>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3400)
 r10:61c88647 r9:83346c00 r8:8382dcac r7:82804d40 r6:ddde2ee0 r5:ddde2f00
 r4:8382dc80
[<8027ade4>] (worker_thread) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:8382dc80 r8:8027ade4 r7:df87de60 r6:8382dd00 r5:83346c00
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf945fb0 to 0xdf945ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281ea0
 r4:83830500
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:00000013 r5:60000093 r4:82260e98
[<80201b08>] (show_stack) from [<8021fc60>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021fc60>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120)
[<8021fbf0>] (dump_stack_lvl) from [<8021fc84>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000001 r4:00000001
[<8021fc6c>] (dump_stack) from [<81a27df0>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113)
[<81a27c90>] (nmi_cpu_backtrace) from [<81a27f3c>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8280c690 r5:8281ac94 r4:ffffffff
[<81a27e0c>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82abd56c r8:82804d40 r7:000da341 r6:00007f2c r5:8281b248 r4:85a2da0c
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d9f8>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d9f8>] (check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037d9f8>] (watchdog+0x4d4/0x81c kernel/hung_task.c:491)
[<8037d524>] (watchdog) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:00000000 r8:8037d524 r7:830cf800 r6:830cf800 r5:83391800
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8e1fb0 to 0xdf8e1ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281ea0
 r4:833db940
Sending NMI from CPU 1 to CPUs 0: