hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
INFO: task syz-executor280:2348 blocked for more than 140 seconds.
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
      Not tainted 4.9.124+ #85
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor280 D
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
29384  2348   2347 0x00000004
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 ffff8801bb47df00 ffff8801bb514d00 ffff8801bb514200 ffff8801bb6f97c0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 ffff8801db7210d8 ffff8801bb6f78d0 ffffffff8277cf52 ffff8801bb47e7c8
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 ffffffff83a916a0 ffff8801bb47e7d0 00000000000039ab ffff8801db7219b0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
Call Trace:
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff8277e47f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82788aa5>] schedule_timeout+0x735/0xe20 kernel/time/timer.c:1768
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff8277fea9>] do_wait_for_common kernel/sched/completion.c:75 [inline]
 [<ffffffff8277fea9>] __wait_for_common kernel/sched/completion.c:93 [inline]
 [<ffffffff8277fea9>] wait_for_common+0x2f9/0x400 kernel/sched/completion.c:101
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff8277ffc8>] wait_for_completion+0x18/0x20 kernel/sched/completion.c:122
 [<ffffffff8112bc34>] flush_work+0x3a4/0x6c0 kernel/workqueue.c:2846
 [<ffffffff8112f19e>] __cancel_work_timer+0x17e/0x440 kernel/workqueue.c:2912
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff8112f477>] cancel_work_sync+0x17/0x20 kernel/workqueue.c:2947
 [<ffffffff820b1a80>] uhid_dev_destroy+0x70/0xf0 drivers/hid/uhid.c:578
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff820b1b51>] uhid_char_release+0x51/0xb0 drivers/hid/uhid.c:655
 [<ffffffff815030b3>] __fput+0x263/0x700 fs/file_table.c:208
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff815035d5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8113c37c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff81003e49>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003e49>] exit_to_usermode_loop+0x129/0x150 arch/x86/entry/common.c:161
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<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
 [<ffffffff8278c053>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0

Showing all locks held in the system:
2 locks held by khungtaskd/24:
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131401c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131401c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 #1:  (tasklist_lock
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
){.+.+..}, at: [<ffffffff813f99b9>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
1 lock held by rsyslogd/2113:
 #0:  (&f->f_pos_lock
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
){+.+.+.}, at: [<ffffffff8155eadc>] __fdget_pos+0xac/0xd0 fs/file.c:781
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
2 locks held by getty/2209:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff8278a122>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81cde522>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.124+ #85
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 ffff8801d9497d08 ffffffff81af4b39 0000000000000000 0000000000000001
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 0000000000000001 0000000000000001 ffffffff81096740 ffff8801d9497d40
 ffffffff81aff897
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 0000000000000001 0000000000000000 0000000000000003
 [<ffffffff81af4b39>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81af4b39>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff81aff897>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff81aff82a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff81096844>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff813145ad>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813145ad>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813145ad>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813145ad>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff811410dd>] kthread+0x26d/0x300 kernel/kthread.c:211
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
 [<ffffffff8278c21c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
Sending NMI from CPU 1 to CPUs 0:
hid-generic 0000:0000:0000.0348: unknown main item tag 0x0
NMI backtrace for cpu 0
CPU: 0 PID: 351 Comm: kworker/0:2 Not tainted 4.9.124+ #85
Workqueue: events uhid_device_add_worker
c
task: ffff8801d568af80 task.stack: ffff8801d3eb0000
RIP: 0010:[<ffffffff81165062>] 
c [<ffffffff81165062>] get_lock_parent_ip include/linux/ftrace.h:731 [inline]
RIP: 0010:[<ffffffff81165062>] 
c [<ffffffff81165062>] preempt_latency_start kernel/sched/core.c:3224 [inline]
RIP: 0010:[<ffffffff81165062>] 
c [<ffffffff81165062>] preempt_count_add+0xc2/0x170 kernel/sched/core.c:3249
RSP: 0018:ffff8801d3eb7238  EFLAGS: 00000002
RAX: ffff8801d3eb7270 RBX: ffffffff811f7f13 RCX: 1ffff1003aad170f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8278b58e
RBP: ffff8801d3eb7248 R08: ffff8801d568b878 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000292
R13: 000000000000003a R14: 0000000000000006 R15: ffffffff83fc75e0
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff93c201f4 CR3: 00000001c9b7c000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff82ec5120
c 0000000000000292
c ffff8801d3eb7270
c ffffffff8278b58e
c
 ffff8801d568b828
c 0000000000000000
c ffffffff82ec5120
c ffff8801d3eb7298
c
 ffffffff811f7f13
c 0000000000000006
c 0000000000000000
c ffffffff81221ac3
c
Call Trace:
 [<ffffffff8278b58e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 [<ffffffff8278b58e>] _raw_spin_lock_irqsave+0x2e/0x70 kernel/locking/spinlock.c:159
 [<ffffffff811f7f13>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:135
 [<ffffffff8121e5e2>] __down_trylock_console_sem kernel/printk/printk.c:220 [inline]
 [<ffffffff8121e5e2>] console_trylock+0x22/0x150 kernel/printk/printk.c:2230
 [<ffffffff81221ac3>] vprintk_emit+0x2b3/0x790 kernel/printk/printk.c:1902
 [<ffffffff81d42d31>] dev_vprintk_emit+0x211/0x650 drivers/base/core.c:2204
 [<ffffffff81d4321e>] dev_printk_emit+0xae/0xe0 drivers/base/core.c:2215
 [<ffffffff81d434d3>] __dev_printk+0x103/0x270 drivers/base/core.c:2227
 [<ffffffff81d43b58>] dev_err+0xd8/0x110 drivers/base/core.c:2270
 [<ffffffff820941cd>] hid_parser_main+0x59d/0x980 drivers/hid/hid-core.c:555
 [<ffffffff820914fe>] hid_open_report+0x38e/0x6f0 drivers/hid/hid-core.c:1010
 [<ffffffff8209598d>] hid_device_probe+0x25d/0x4e0 drivers/hid/hid-core.c:2234
 [<ffffffff81d4e187>] really_probe drivers/base/dd.c:367 [inline]
 [<ffffffff81d4e187>] driver_probe_device+0x217/0x660 drivers/base/dd.c:507
 [<ffffffff81d4e9a5>] __device_attach_driver+0x205/0x270 drivers/base/dd.c:602
 [<ffffffff81d48632>] bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:463
 [<ffffffff81d4dd81>] __device_attach+0x211/0x300 drivers/base/dd.c:659
 [<ffffffff81d4eaaa>] device_initial_probe+0x1a/0x20 drivers/base/dd.c:706
 [<ffffffff81d4bb49>] bus_probe_device+0x1e9/0x290 drivers/base/bus.c:557
 [<ffffffff81d45381>] device_add+0x861/0x1520 drivers/base/core.c:1140
 [<ffffffff8209982a>] hid_add_device+0x31a/0x940 drivers/hid/hid-core.c:2710
 [<ffffffff820b1bf8>] uhid_device_add_worker+0x48/0x160 drivers/hid/uhid.c:66
 [<ffffffff8112fcf1>] process_one_work+0x791/0x1470 kernel/workqueue.c:2092
 [<ffffffff81130aa6>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff811410dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8278c21c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 
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c