INFO: task syz-executor2:8992 blocked for more than 140 seconds.
      Not tainted 4.9.128+ #93
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D29000  8992   2102 0x00000000
 ffff8801a9602f80 ffff8801d5d0f900 ffff8801d769c200 ffff8801d6a32f80
 ffff8801db621018 ffff8801a8cf7818 ffffffff8277ee02 0000000000000000
 ffff8801a9603830 ffffed00352c0705 00ff8801a9602f80 ffff8801db6218f0
Call Trace:
 [<ffffffff8278032f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82780cb3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff82782936>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff82782936>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
 [<ffffffff814e3487>] filp_close+0xa7/0x140 fs/open.c:1129
 [<ffffffff8154b361>] close_files fs/file.c:406 [inline]
 [<ffffffff8154b361>] put_files_struct+0x151/0x250 fs/file.c:434
 [<ffffffff8154b583>] exit_files+0x83/0xb0 fs/file.c:463
 [<ffffffff810e3ff9>] do_exit+0x759/0x2750 kernel/exit.c:828
 [<ffffffff810ea481>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110b411>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81051225>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:157
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278df13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8130a0ac>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813e71ec>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2026:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278bfd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81cdee72>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor2/8992:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor2/8999:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350
1 lock held by syz-executor2/17064:
 #0:  (&evdev->mutex){+.+.+.}, at: [<ffffffff81fea2b2>] evdev_flush+0x72/0x120 drivers/input/evdev.c:350

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.128+ #93
 ffff8801d9907d08 ffffffff81af2469 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810967d0 ffff8801d9907d40
 ffffffff81afd1c9 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81af2469>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af2469>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81afd1c9>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81afd15c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810968d4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8130a63d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8130a63d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8130a63d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8130a63d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff8113e00d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278e0dc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5807 Comm: syz-executor5 Not tainted 4.9.128+ #93
task: ffff8801c8748000 task.stack: ffff8801a8038000
RIP: 0010:[<ffffffff811ff385>] 
c [<ffffffff811ff385>] __trace_hardirqs_on_caller kernel/locking/lockdep.c:2693 [inline]
RIP: 0010:[<ffffffff811ff385>] 
c [<ffffffff811ff385>] trace_hardirqs_on_caller+0x335/0x590 kernel/locking/lockdep.c:2736
RSP: 0018:ffff8801a803fee0  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801c8748000 RCX: 0000000000000000
RDX: 1ffff100390e910e RSI: 0000000000000001 RDI: ffff8801c8748870
RBP: ffff8801a803fef0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000bcb4dde9
R13: 0000000000a3fb9f R14: 00007f3fbd2699c0 R15: 0000000000000000
FS:  00007f3fbd269700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c424a87010 CR3: 00000001c848c000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 000000000072bf08
c 000000000072bf0c
c ffff8801a803ff48
c ffffffff8100226a
c
 0000000000000000
c 0000000000000000
c 0000000000000000
c 0000000000000000
c
 0000000000000000
c 0000000000000000
c 1ffff100390e9001
c ffffffff81005626
c
Call Trace:
 [<ffffffff8100226a>] trace_hardirqs_on_thunk+0x1a/0x1c
 [<ffffffff8278df40>] entry_SYSCALL_64_after_swapgs+0x8a/0xdb
Code: 
c8d 
c60 
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c04 
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c47 
c01 
c00 
c00 
c44 
c89 
ca3 
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c08 
c00 
c00 
c<65> 
c48 
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c1c 
c25 
c00 
c7e 
c01 
c00 
c48 
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c08 
c00 
c00 
c48 
cb8 
c00 
c00 
c00 
c