INFO: task kworker/0:0H:11 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0H    state:D stack:26504 pid:11    tgid:11    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: kblockd blk_mq_requeue_work
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 nbd_queue_rq+0x857/0x1100
 blk_mq_dispatch_rq_list+0xa70/0x1910
 __blk_mq_sched_dispatch_requests+0xdcc/0x1600
 blk_mq_sched_dispatch_requests+0xd7/0x190
 blk_mq_run_hw_queue+0x348/0x4f0
 blk_mq_run_hw_queues+0x26c/0x3f0
 blk_mq_requeue_work+0x71c/0x780
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:0H/11:
 #0: ffff888102a83140 ((wq_completion)kblockd){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90000107c40 ((work_completion)(&(&q->requeue_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff88816d565298 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #3: ffff88811f8b8578 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0x1100
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5437:
 #0: ffff888110e310a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by kworker/u8:2/5506:
 #0: ffff888171ee6940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000add7c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
4 locks held by kworker/0:4/5667:
 #0: ffff888100692d40 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90004ff7c40 ((work_completion)(&(&ssp->srcu_sup->work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8e95dc48 (&ssp->srcu_sup->srcu_gp_mutex){+.+.}-{4:4}, at: process_srcu+0x6e/0x1630
 #3: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by udevd/10190:
 #0: ffff88816d5ad350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.1.3139/17853:
1 lock held by syz.2.3142/17859:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x722/0xbe0
1 lock held by syz.2.3142/17865:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xefa/0x2ea0
1 lock held by syz.2.3142/17866:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: do_ip_setsockopt+0xefa/0x2ea0
1 lock held by syz.2.3142/17867:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_setlink+0x55e/0x940
1 lock held by syz.2.3142/17868:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
2 locks held by syz.0.3143/17861:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x83c/0x1150
 #1: ffffffff8e963068 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.0.3143/17863:
 #0: ffffffff8fdd0300 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x83c/0x1150

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17853 Comm: syz.1.3139 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:bpf_test_timer_continue+0x24/0x320
Code: 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 50 4d 89 c7 48 89 0c 24 89 d5 41 89 f4 48 89 fb 49 bd 00 00 00 00 00 fc ff df <e8> 27 81 04 f8 49 89 de 49 c1 ee 03 43 0f b6 04 2e 84 c0 0f 85 4b
RSP: 0018:ffffc9000b407b00 EFLAGS: 00000282
RAX: 00000000fffffffe RBX: ffffc9000b407ba8 RCX: ffffc9000b407ba0
RDX: 00000000fffffffc RSI: 0000000000000001 RDI: ffffc9000b407ba8
RBP: 00000000fffffffc R08: ffffc9000b407ba4 R09: 1ffff11021a4903f
R10: dffffc0000000000 R11: ffffed1021a49040 R12: 0000000000000001
R13: dffffc0000000000 R14: ffffc9000b407d60 R15: ffffc9000b407ba4
FS:  00007f5f197796c0(0000) GS:ffff88818dc87000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b24167ff8 CR3: 00000001a2d9e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bpf_prog_test_run_flow_dissector+0x3c4/0x610
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x643/0x950
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f1899cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5f19779028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f5f18c15fa0 RCX: 00007f5f1899cdd9
RDX: 0000000000000050 RSI: 0000200000000180 RDI: 000000000000000a
RBP: 00007f5f18a32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5f18c16038 R14: 00007f5f18c15fa0 R15: 00007fff00b2e938
 </TASK>
