INFO: task kworker/u4:1:22 blocked for more than 140 seconds.
Not tainted 4.14.215-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:1 D26848 22 2 0x80000000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
__synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898
fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:156
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task kworker/u4:5:9330 blocked for more than 140 seconds.
Not tainted 4.14.215-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:5 D29136 9330 2 0x80000000
Workqueue: events_unbound fsnotify_mark_destroy_workfn
Call Trace:
context_switch kernel/sched/core.c:2808 [inline]
__schedule+0x88b/0x1de0 kernel/sched/core.c:3384
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724
do_wait_for_common kernel/sched/completion.c:91 [inline]
__wait_for_common kernel/sched/completion.c:112 [inline]
wait_for_common+0x272/0x430 kernel/sched/completion.c:123
__synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898
fsnotify_mark_destroy_workfn+0xed/0x2e0 fs/notify/mark.c:757
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Showing all locks held in the system:
2 locks held by kworker/u4:1/22:
#0: ("events_unbound"){+.+.}, at: [<ffffffff81373800>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: (connector_reaper_work){+.+.}, at: [<ffffffff81373836>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
1 lock held by khungtaskd/1532:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81430fa4>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
2 locks held by kworker/u4:5/9330:
#0: ("events_unbound"){+.+.}, at: [<ffffffff81373800>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087
#1: ((reaper_work).work){+.+.}, at: [<ffffffff81373836>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091
1 lock held by syz-executor.0/25399:
#0: (&rtc->ops_lock){+.+.}, at: [<ffffffff84bef81e>] rtc_dev_ioctl+0xce/0x760 drivers/rtc/rtc-dev.c:219
1 lock held by syz-executor.0/25417:
#0: (&rtc->ops_lock){+.+.}, at: [<ffffffff84bef81e>] rtc_dev_ioctl+0xce/0x760 drivers/rtc/rtc-dev.c:219
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5b9/0xb40 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.215-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events rtc_timer_do_work
task: ffff8880b54aa4c0 task.stack: ffff8880b54b0000
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192
RSP: 0018:ffff8880b54b7b90 EFLAGS: 00000286
RAX: 1ffffffff11e1251 RBX: 0000000000000286 RCX: 1ffff11016a955b7
RDX: dffffc0000000000 RSI: ffff8880b54aad98 RDI: 0000000000000286
RBP: ffff88823787cba0 R08: ffffffff8b9a5138 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286
R13: ffff88823787cba0 R14: ffff88823787cc68 R15: ffffffff84bee890
FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffd8e2cbc7 CR3: 00000000aba45000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irqrestore include/linux/spinlock.h:372 [inline]
rtc_handle_legacy_irq+0x109/0x180 drivers/rtc/interface.c:521
rtc_timer_do_work+0x1f7/0x5a0 drivers/rtc/interface.c:881
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: fa 48 c7 c0 88 92 f0 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d fc bc cf 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 ac 4b df f9 eb c0 0f 0b 0f 0b 48 c7 c7