INFO: task kworker/u10:3:56 blocked for more than 430 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:3 state:D stack:0 pid:56 tgid:56 ppid:2 task_flags:0x4208160 flags:0x00000000
Workqueue: events_unbound idle_cull_fn
Call trace:
[<81a391b4>] (__schedule) from [<81a3a148>] (__schedule_loop kernel/sched/core.c:7011 [inline])
[<81a391b4>] (__schedule) from [<81a3a148>] (schedule+0x2c/0x130 kernel/sched/core.c:7026)
r10:00000000 r9:7fffffff r8:df945df4 r7:00000002 r6:838bc800 r5:857f1d30
r4:838bc800
[<81a3a11c>] (schedule) from [<81a41f8c>] (schedule_timeout+0xcc/0x114 kernel/time/sleep_timeout.c:75)
r5:857f1d30 r4:7fffffff
[<81a41ec0>] (schedule_timeout) from [<81a3ad88>] (do_wait_for_common kernel/sched/completion.c:100 [inline])
[<81a41ec0>] (schedule_timeout) from [<81a3ad88>] (__wait_for_common+0x90/0x1a8 kernel/sched/completion.c:121)
r6:857f1d2c r5:857f1d30 r4:838bc800
[<81a3acf8>] (__wait_for_common) from [<81a3aec0>] (wait_for_common kernel/sched/completion.c:132 [inline])
[<81a3acf8>] (__wait_for_common) from [<81a3aec0>] (wait_for_completion+0x20/0x24 kernel/sched/completion.c:153)
r10:8300e870 r9:832de405 r8:8300e64c r7:df945ea0 r6:857f1d00 r5:859c4800
r4:859c4a04
[<81a3aea0>] (wait_for_completion) from [<80281cd4>] (kthread_stop+0x84/0x270 kernel/kthread.c:790)
[<80281c50>] (kthread_stop) from [<80281ed4>] (kthread_stop_put+0x14/0x80 kernel/kthread.c:811)
r7:df945ea0 r6:df945ea0 r5:83e4cd00 r4:859c4800
[<80281ec0>] (kthread_stop_put) from [<80273c7c>] (reap_dying_workers+0x50/0x6c kernel/workqueue.c:2860)
r5:83e4cd00 r4:df945ea0
[<80273c2c>] (reap_dying_workers) from [<802750fc>] (idle_cull_fn+0xdc/0x160 kernel/workqueue.c:2982)
r7:00000100 r6:00000122 r5:df945ea0 r4:df945ea0
[<80275020>] (idle_cull_fn) from [<80278594>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263)
r8:838bc800 r7:832dc000 r6:832de400 r5:8300e64c r4:833ff180
[<802783e0>] (process_one_work) from [<802791dc>] (process_scheduled_works kernel/workqueue.c:3346 [inline])
[<802783e0>] (process_one_work) from [<802791dc>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427)
r10:61c88647 r9:838bc800 r8:833ff1ac r7:82804d40 r6:832dc000 r5:832dc020
r4:833ff180
[<80278fe0>] (worker_thread) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463)
r10:00000000 r9:833ff180 r8:80278fe0 r7:df901e60 r6:833ff300 r5:838bc800
r4:00000001
[<802800d4>] (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 r5:802800d4
r4:833fcdc0
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 r6:00000113 r5:60000193 r4:8224e02c
[<80201b08>] (show_stack) from [<8021f924>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021f924>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:120)
[<8021f8b4>] (dump_stack_lvl) from [<8021f948>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
r5:00000001 r4:00000001
[<8021f930>] (dump_stack) from [<81a22dcc>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113)
[<81a22c6c>] (nmi_cpu_backtrace) from [<81a22f18>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
r7:00000001 r6:8280c690 r5:8281ae00 r4:ffffffff
[<81a22de8>] (nmi_trigger_cpumask_backtrace) from [<802304fc>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
r9:8281b9e8 r8:8280c810 r7:000216c0 r6:00007f3c r5:82abe7d4 r4:838cda0c
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline])
[<802304e4>] (arch_trigger_cpumask_backtrace) from [<8037f2b4>] (watchdog+0x5d0/0x850 kernel/hung_task.c:495)
[<8037ece4>] (watchdog) from [<80280200>] (kthread+0x12c/0x280 kernel/kthread.c:463)
r10:00000000 r9:00000000 r8:8037ece4 r7:833ab380 r6:833ab380 r5:83369800
r4:00000001
[<802800d4>] (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 r5:802800d4
r4:8339e000
Sending NMI from CPU 1 to CPUs 0: