INFO: task loop7:9995 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
loop7           D26952  9995      2 0x80000000
 ffff8801c9168000 ffff8801d3bef380 ffff8801d3bef380 ffff8801a8168000
 ffff8801db721018 ffff8801cfc66df0 ffffffff828075c2 ffff8801c91688b0
 1ffff10039f8cdb2 ffffffff83c42af8 0000000041b58ab3 ffff8801db7218f0
Call Trace:
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff828142d5>] schedule_timeout+0x735/0xe20 kernel/time/timer.c:1771
 [<ffffffff82806d8a>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5176
 [<ffffffff81b07dac>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff81b07dac>] bt_get.isra.2+0x27c/0x780 block/blk-mq-tag.c:141
 [<ffffffff81b088dc>] __blk_mq_get_tag block/blk-mq-tag.c:163 [inline]
 [<ffffffff81b088dc>] blk_mq_get_tag+0xac/0x220 block/blk-mq-tag.c:192
 [<ffffffff81af71da>] __blk_mq_alloc_request+0x2a/0x970 block/blk-mq.c:196
 [<ffffffff81afa914>] blk_mq_map_request.isra.6+0x3c4/0x8f0 block/blk-mq.c:1207
input:  as /devices/virtual/input/input40
 [<ffffffff81b032d0>] blk_sq_make_request+0x1a0/0xd10 block/blk-mq.c:1374
A link change request failed with some changes committed already. Interface syz_tun may have been left with an inconsistent configuration, please check.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=22442 comm=syz-executor.3
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=22442 comm=syz-executor.3
IPv6: ADDRCONF(NETDEV_CHANGE): syz_tun: link becomes ready
 [<ffffffff81ad4b81>] generic_make_request+0x211/0x800 block/blk-core.c:2052
 [<ffffffff81ad5220>] submit_bio+0xb0/0x410 block/blk-core.c:2123
 [<ffffffff815d6c74>] dio_bio_submit fs/direct-io.c:420 [inline]
 [<ffffffff815d6c74>] do_blockdev_direct_IO fs/direct-io.c:1301 [inline]
 [<ffffffff815d6c74>] __blockdev_direct_IO+0x8fe4/0xbd10 fs/direct-io.c:1360
 [<ffffffff815c67f0>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8141374b>] generic_file_read_iter+0x83b/0x1a80 mm/filemap.c:1964
 [<ffffffff815c9d25>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff81de62ac>] lo_rw_aio+0x72c/0x910 drivers/block/loop.c:506
 [<ffffffff81de97d6>] do_req_filebacked drivers/block/loop.c:543 [inline]
 [<ffffffff81de97d6>] loop_handle_cmd drivers/block/loop.c:1732 [inline]
 [<ffffffff81de97d6>] loop_queue_work+0x376/0x2220 drivers/block/loop.c:1744
 [<ffffffff81143090>] kthread_worker_fn+0x2c0/0x790 kernel/kthread.c:633
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by kworker/1:0/18:
 #0:  ("events"){.+.+.+}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  ((&rew.rew_work)){+.+...}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2034:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor.4/22438:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff823412d7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 #1:  (rcu_preempt_state.exp_mutex){+.+...}, at: [<ffffffff8124a749>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline]
 #1:  (rcu_preempt_state.exp_mutex){+.+...}, at: [<ffffffff8124a749>] _synchronize_rcu_expedited+0x339/0x840 kernel/rcu/tree_exp.h:569
1 lock held by syz-executor.5/22440:
 #0:  (input_mutex){+.+.+.}, at: [<ffffffff82046052>] __input_unregister_device+0x152/0x490 drivers/input/input.c:2020

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #1
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 22442 Comm: syz-executor.3 Not tainted 4.9.141+ #1
task: ffff88019efa2f80 task.stack: ffff8801d6d18000
RIP: 0010:[<ffffffff8131ba60>] 
c [<ffffffff8131ba60>] __sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801d6d1f910  EFLAGS: 00000297
RAX: 00007fffffffefc8 RBX: 00000000208a9c80 RCX: ffffc90004776000
RDX: 1ffff10033df4854 RSI: ffffffff822a172a RDI: ffff88019efa42a0
RBP: ffff8801d6d1f970 R08: 0000000000022a54 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8801d6d1fda8
R13: ffff88019efa2f80 R14: ffff8801d6d1fa20 R15: ffff8801c3abccc0
FS:  00007f2a97e7e700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000208a9030 CR3: 00000001902f2000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff822a176e
c ffffffff822a27bf
c ffff8801d6d1f938
c ffffffff81243e83
c
 ffff8801d6d1f9e0
c ffff8801d6d1f970
c ffffffff814efa57
c ffff8801d6d1fda8
c
 dffffc0000000000
c 0000000000000002
c 00000000208a9c80
c ffff8801c3abccc0
c
Call Trace:
 [<ffffffff822a2571>] ___sys_recvmsg+0x111/0x510 net/socket.c:2129
 [<ffffffff822a5cad>] __sys_recvmmsg+0x25d/0x6f0 net/socket.c:2249
 [<ffffffff822a62d9>] SYSC_recvmmsg net/socket.c:2325 [inline]
 [<ffffffff822a62d9>] SyS_recvmmsg+0x199/0x1c0 net/socket.c:2314
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
ce8 
c26 
c76 
c1d 
c00 
c48 
c8b 
c75 
cc8 
ce9 
cc3 
cfe 
cff 
cff 
c4c 
c89 
cff 
ce8 
c15 
c76 
c1d 
c00 
ce9 
c9e 
cfe 
cff 
cff 
c4c 
c89 
ce7 
ce8 
c08 
c76 
c1d 
c00 
ce9 
c23 
cfe 
cff 
cff 
c0f 
c1f 
c00 
c<55> 
c48 
c89 
ce5 
c48 
c8b 
c75 
c08 
c65 
c48 
c8b 
c04 
c25 
c00 
c7e 
c01 
c00 
c65 
c8b 
c15 
c18 
c