hid-generic 0000:0000:0000.02FE: unknown main item tag 0x0
hid-generic 0000:0000:0000.02FE: unknown main item tag 0x0
hid-generic 0000:0000:0000.02FE: unknown main item tag 0x0
hid-generic 0000:0000:0000.02FE: unknown main item tag 0x0
hid-generic 0000:0000:0000.02FE: hidraw0: <UNKNOWN> HID v0.00 Device [syz0] on syz0
INFO: task init:20389 blocked for more than 140 seconds.
      Not tainted 4.9.194+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D29304 20389      1 0x00000000
 0000000000000087 ffff8801d77c2f80 0000000000000000 ffff8801db621000
 ffffffff83031180 ffff8801db621018 ffff8801a1a0f758 ffffffff8281af8e
 ffff8801d77c3848 ffff8801d77c3820 00ff8801d77c3850 ffff8801db6218f0
Call Trace:
 [<00000000c2eb16a2>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<00000000a550dbae>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<0000000019c04c86>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<0000000019c04c86>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
 [<0000000064274619>] chrdev_open+0x230/0x630 fs/char_dev.c:398
 [<00000000e70ab23b>] do_dentry_open+0x422/0xd20 fs/open.c:791
 [<0000000015050da0>] vfs_open+0x105/0x230 fs/open.c:904
 [<00000000b41e77a2>] do_last fs/namei.c:3541 [inline]
 [<00000000b41e77a2>] path_openat+0xbf5/0x2f60 fs/namei.c:3665
 [<000000007c9fd871>] do_filp_open+0x1a1/0x280 fs/namei.c:3699
 [<00000000bedc6a34>] do_sys_open+0x2f0/0x610 fs/open.c:1097
 [<00000000a8592ef2>] SYSC_open fs/open.c:1115 [inline]
 [<00000000a8592ef2>] SyS_open+0x2d/0x40 fs/open.c:1110
 [<000000004c8e8f89>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000053f2ec4d>] 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: [<0000000052981964>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<0000000052981964>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.+..}, at: [<00000000ed3bea87>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1892:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<00000000197e490e>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2019:
 #0:  (&tty->ldisc_sem){++++++}, at: [<00000000f8b897fb>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<0000000010739756>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by init/20389:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
1 lock held by init/20390:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
1 lock held by init/20391:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
1 lock held by init/20392:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
1 lock held by init/20826:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000d22773b0>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140
1 lock held by syz-executor.4/25854:
 #0:  (tty_mutex){+.+.+.}, at: [<00000000666da186>] ptmx_open drivers/tty/pty.c:753 [inline]
 #0:  (tty_mutex){+.+.+.}, at: [<00000000666da186>] ptmx_open+0xe5/0x310 drivers/tty/pty.c:720

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0
 ffff8801d98d7cc8 ffffffff81b67001 0000000000000000 0000000000000000
 0000000000000000 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b7229c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<0000000069eb8ce1>] __dump_stack lib/dump_stack.c:15 [inline]
 [<0000000069eb8ce1>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000b4fcb559>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<000000009b06cb67>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<000000000d85574a>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<000000008bacedec>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<000000008bacedec>] check_hung_task kernel/hung_task.c:126 [inline]
 [<000000008bacedec>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<000000008bacedec>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<000000000b6d15be>] kthread+0x278/0x310 kernel/kthread.c:211
 [<000000005c8e808e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20388 Comm: init Not tainted 4.9.194+ #0
task: 0000000080fd62d9 task.stack: 000000001e557da9
RIP: 0010:[<ffffffff81d86cdb>] 
c [<00000000feb19ac1>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff88013bb17570  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff81d86c81 RDI: ffffffff84b68e58
RBP: ffff88013bb17580 R08: 0000000000000001 R09: 0000000000003921
R10: ffff8801c847a0c0 R11: 0000000000000001 R12: ffffffff84b68e20
R13: 0000000000000020 R14: fffffbfff096d20b R15: fffffbfff096d1cd
FS:  00007f21e2bdf7a0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe2af6dd0c CR3: 00000001a80d8000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff84b68e20
c 000000000000270c
c ffff88013bb175d0
c ffffffff81d88f24
c
 ffff88013bb17608
c ffffffff84b68e68
c ffffffff84b6905a
c ffffffff841d75e3
c
 ffffffff84b68e20
c 0000000000000030
c dffffc0000000000
c 0000000000000030
c
Call Trace:
 [<00000000b9a968ef>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<00000000b9a968ef>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997
 [<000000001c4b8d0e>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103
 [<00000000e30442fb>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885
 [<00000000c7a64706>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169
 [<000000000614493d>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<0000000025924e8e>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594
 [<000000008f96a769>] console_unlock+0x47c/0xb20 kernel/printk/printk.c:2454
 [<000000006426bb96>] console_device+0x97/0xc0 kernel/printk/printk.c:2562
 [<00000000cd8886d9>] tty_lookup_driver drivers/tty/tty_io.c:2018 [inline]
 [<00000000cd8886d9>] tty_open_by_driver drivers/tty/tty_io.c:2063 [inline]
 [<00000000cd8886d9>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2140
 [<0000000064274619>] chrdev_open+0x230/0x630 fs/char_dev.c:398
 [<00000000e70ab23b>] do_dentry_open+0x422/0xd20 fs/open.c:791
 [<0000000015050da0>] vfs_open+0x105/0x230 fs/open.c:904
 [<00000000b41e77a2>] do_last fs/namei.c:3541 [inline]
 [<00000000b41e77a2>] path_openat+0xbf5/0x2f60 fs/namei.c:3665
 [<000000007c9fd871>] do_filp_open+0x1a1/0x280 fs/namei.c:3699
 [<00000000bedc6a34>] do_sys_open+0x2f0/0x610 fs/open.c:1097
 [<00000000a8592ef2>] SYSC_open fs/open.c:1115 [inline]
 [<00000000a8592ef2>] SyS_open+0x2d/0x40 fs/open.c:1110
 [<000000004c8e8f89>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000053f2ec4d>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
c00 
c49 
c8d 
c7c 
c24 
c38 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
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c48 
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c48 
cc1 
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c80 
c3c 
c02 
c00 
c75 
c17 
c41 
c03 
c5c 
c24 
c38 
c89 
cda 
cec 
c<5b> 
c0f 
cb6 
cc0 
c41 
c5c 
c5d 
cc3 
ce8 
c48 
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c77 
cff 
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cc2 
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ca1 
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c77 
cff 
ceb 
c