INFO: task kworker/1:1:61 blocked for more than 142 seconds.
      Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:1     D25952    61      2 0x80004000
Workqueue: events proc_cleanup_work
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081
 schedule+0xdc/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common kernel/sched/completion.c:115 [inline]
 wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
 __wait_rcu_gp+0x225/0x2f0 kernel/rcu/update.c:374
 synchronize_rcu.part.0+0xcf/0xe0 kernel/rcu/tree.c:2768
 synchronize_rcu+0x27/0xa0 kernel/rcu/tree.c:2769
 kern_unmount+0x6c/0xf0 fs/namespace.c:3808
 pid_ns_release_proc+0x37/0x41 fs/proc/root.c:334
 proc_cleanup_work+0x19/0x20 kernel/pid_namespace.c:63
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
 worker_thread+0x98/0xe40 kernel/workqueue.c:2410
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task syz-executor.0:8835 blocked for more than 143 seconds.
      Not tainted 5.4.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D28160  8835   8031 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x8e1/0x1f30 kernel/sched/core.c:4081
 schedule+0xdc/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x717/0xc50 kernel/time/timer.c:1871
 do_wait_for_common kernel/sched/completion.c:83 [inline]
 __wait_for_common kernel/sched/completion.c:104 [inline]
 wait_for_common kernel/sched/completion.c:115 [inline]
 wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
 __wait_rcu_gp+0x225/0x2f0 kernel/rcu/update.c:374
 synchronize_rcu.part.0+0xcf/0xe0 kernel/rcu/tree.c:2768
 synchronize_rcu+0x27/0xa0 kernel/rcu/tree.c:2769
 evdev_detach_client+0x104/0x150 drivers/input/evdev.c:400
 evdev_release+0xac/0x1e0 drivers/input/evdev.c:459
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413d81
Code: 31 44 00 ff d3 85 c0 75 da b9 a0 98 65 00 31 d2 be 53 25 44 00 bf d2 3c 44 00 ff 15 b1 5a 24 00 eb c1 90 90 90 90 90 90 90 c7 <07> 01 00 00 00 31 c0 c3 0f 1f 80 00 00 00 00 c7 07 00 00 00 00 31
RSP: 002b:00007ffdd76b6e40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000009 RCX: 0000000000413d81
RDX: fffffffffffffff7 RSI: 0000000000000c65 RDI: 0000000000000008
RBP: 000000000071c980 R08: 00000000e1114c65 R09: 00000000e1114c69
R10: 00007ffdd76b6f70 R11: 0000000000000293 R12: 0000000000000001
R13: 000000000071c980 R14: 0000000000722b40 R15: 00007ffdd76b6f50

Showing all locks held in the system:
2 locks held by kworker/1:1/61:
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
 #0: ffff88802cc27d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2235
 #1: ffff88802c1e7dc0 ((work_completion)(&ns->proc_work)){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2239
1 lock held by khungtaskd/1114:
 #0: ffffffff895a4080 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
2 locks held by getty/7973:
 #0: ffff88802212e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900026ee2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7974:
 #0: ffff88802225d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900026fa2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7975:
 #0: ffff888022367090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900040122e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7976:
 #0: ffff88802235f090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900026f62e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7977:
 #0: ffff88802c373090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900040022e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7978:
 #0: ffff8880294d3090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc9000400a2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
2 locks held by getty/7979:
 #0: ffff8880252e8090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
 #1: ffffc900026e22e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 drivers/tty/n_tty.c:2156
4 locks held by syz-executor.0/8838:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1114 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xb11/0x10c0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0,2-3:
NMI backtrace for cpu 3 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
NMI backtrace for cpu 2
CPU: 2 PID: 8838 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:200 [inline]
RIP: 0010:native_write_msr+0x6/0x30 arch/x86/include/asm/msr.h:164
Code: d0 c3 0f 21 d8 c3 0f 21 f0 c3 0f 0b 0f 1f 84 00 00 00 00 00 0f 0b 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 89 f9 89 f0 0f 30 <0f> 1f 44 00 00 c3 55 48 c1 e2 20 89 f6 48 89 e5 48 09 d6 31 d2 e8
RSP: 0018:ffff88802d409a28 EFLAGS: 00000082
RAX: 000000009da0d15e RBX: 0000000000000000 RCX: 00000000000006e0
RDX: 000000000000007e RSI: 000000009da0d15e RDI: 00000000000006e0
RBP: ffff88802d409a40 R08: ffff88800d3a8980 R09: ffff88800d3a9210
R10: fffffbfff146dba0 R11: ffffffff8a36dd07 R12: ffff88802d4227c0
R13: 00000000000005bf R14: 0000000000000000 R15: 0000000000000001
FS:  00007fec29830700(0000) GS:ffff88802d400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000017f9008 CR3: 000000000ff7a000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 clockevents_program_event+0x25c/0x370 kernel/time/clockevents.c:334
 tick_program_event+0xb4/0x130 kernel/time/tick-oneshot.c:44
 hrtimer_interrupt+0x369/0x770 kernel/time/hrtimer.c:1651
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:hsr_forward_skb+0x0/0x1d30 net/hsr/hsr_forward.c:349
Code: ff e8 b4 d5 c5 f9 48 c7 c6 40 1b d3 88 4c 89 e7 41 bf ea ff ff ff e8 97 b4 5d fe e9 ec fa ff ff cc cc cc cc cc cc cc cc cc cc <55> 48 89 e5 41 57 49 89 ff 41 56 41 55 41 54 4d 8d a7 b6 00 00 00
RSP: 0018:ffff88802d409c50 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13
RAX: ffff88800d3a8980 RBX: 0000000000000028 RCX: ffffffff87aeb084
RDX: 0000000000000100 RSI: ffff8880279f6800 RDI: ffff888020391780
RBP: ffff88802d409cd0 R08: ffff88800d3a8980 R09: ffff88802253b45c
R10: ffffed10044a7690 R11: ffff88802253b483 R12: ffff888020391780
R13: ffff8880279f6800 R14: 0000000000000084 R15: 0000000000000000
 hsr_announce+0x12f/0x3b0 net/hsr/hsr_device.c:334
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199
Code: c0 68 34 53 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 12 2a 99 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 e7 6b 96 f9 65 8b 05 18 14 48 78 85 c0 74 06 41
RSP: 0018:ffff888010b578d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12a668d RBX: ffff88800d3a8980 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88800d3a9214
RBP: ffff888010b578e0 R08: 1ffffffff15d29b8 R09: fffffbfff15d29b9
R10: fffffbfff15d29b8 R11: ffffffff8ae94dc7 R12: ffff88802d437380
R13: ffff88802c4bc3c0 R14: ffff8880258d8e00 R15: 0000000000000000
 finish_lock_switch kernel/sched/core.c:3124 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x8e9/0x1f30 kernel/sched/core.c:4081
 preempt_schedule_common+0x4f/0xe0 kernel/sched/core.c:4236
 preempt_schedule+0x4b/0x60 kernel/sched/core.c:4261
 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
 smp_call_function_single+0x410/0x480 kernel/smp.c:313
 task_function_call+0xe9/0x180 kernel/events/core.c:114
 perf_install_in_context+0x308/0x5a0 kernel/events/core.c:2746
 __do_sys_perf_event_open+0x1cbc/0x2c70 kernel/events/core.c:11543
 __se_sys_perf_event_open kernel/events/core.c:11151 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:11151
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: bd b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fec2982fc88 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000071bf00 RCX: 000000000045a759
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000280
RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007fec298306d4
R13: 00000000004aec2b R14: 00000000006f1ca8 R15: 00000000ffffffff