INFO: task kworker/1:0H:25 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0H    state:D stack:26408 pid:25    tgid:25    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: kblockd blk_mq_requeue_work
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 nbd_queue_rq+0x674/0xf40
 blk_mq_dispatch_rq_list+0xa70/0x1910
 __blk_mq_sched_dispatch_requests+0xdce/0x15d0
 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+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
4 locks held by kworker/1:0H/25:
 #0: ffff8881604a4148 ((wq_completion)kblockd){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900001f7bc0 ((work_completion)(&(&q->requeue_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88816c12cb18 (set->srcu){.+.+}-{0:0}, at: blk_mq_run_hw_queue+0x31f/0x4f0
 #3: ffff88802426a980 (&cmd->lock){+.+.}-{4:4}, at: nbd_queue_rq+0xc6/0xf40
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:1/37:
 #0: ffff888100089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000ad7bc0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
2 locks held by getty/5630:
 #0: ffff888114b340a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
5 locks held by kworker/u8:3/5836:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90004d57bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f79bbb0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffffffff8f7aa548 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xe5/0xa10
 #4: ffffffff8e360c78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by udevd/11835:
 #0: ffff8881a82e6358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
4 locks held by syz.2.5962/28274:
 #0: ffffffff8f8188d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffff88816d62a0e8 (&dev->mutex){....}-{4:4}, at: devlink_get_from_attrs_lock+0x246/0x3b0
 #2: ffff88816d62b250 (&devlink->lock_key#2){+.+.}-{4:4}, at: devlink_get_from_attrs_lock+0x255/0x3b0
 #3: ffffffff8f7aa548 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x88/0x290
2 locks held by syz.0.5966/28282:
 #0: ffffffff8fd11f90 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f7aa548 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
2 locks held by syz.0.5966/28286:
 #0: ffff888169db06f0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #1: ffffffff8f7aa548 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by syz.1.5965/28285:
 #0: ffff88811383d4d8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nf_tables_valid_genid+0x3b/0x100
 #1: ffffffff8e360c78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

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

NMI backtrace for cpu 0
CPU: 0 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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 28282 Comm: syz.0.5966 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:vprintk_emit+0x2fe/0x560
Code: 34 8e 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 95 28 fd ff 48 83 c4 08 f6 05 3a de 3d 18 01 0f 84 8b 00 00 00 f3 90 <f6> 05 2b de 3d 18 01 0f 84 83 00 00 00 e8 e0 91 20 00 eb ea e8 d9
RSP: 0018:ffffc90008fb6500 EFLAGS: 00000093
RAX: ffffffff81a1e780 RBX: ffffffff81a1e73f RCX: ffff88816d1a8000
RDX: 0000000000000000 RSI: ffffffff8dd42c64 RDI: ffffffff8be73900
RBP: ffffc90008fb65b0 R08: ffffffff81a1e73f R09: ffffffff8e34c700
R10: dffffc0000000000 R11: fffffbfff1c698d5 R12: 0000000000000000
R13: 000000000000003e R14: 0000000000000200 R15: 1ffff920011f6ca4
FS:  00007f024e2356c0(0000) GS:ffff8882a9918000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f712ff8 CR3: 00000001957b6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 _printk+0xdd/0x130
 netdev_info+0x11e/0x180
 bond_change_active_slave+0xb7e/0x35e0
 bond_select_active_slave+0x909/0xd40
 bond_enslave+0x21e6/0x3b00
 do_set_master+0x533/0x6d0
 rtnl_newlink_create+0x6af/0xb70
 rtnl_newlink+0x1666/0x1be0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x4d7/0x810
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f024d39acb9
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:00007f024e235028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f024d615fa0 RCX: 00007f024d39acb9
RDX: 00000000000440b0 RSI: 0000200000000280 RDI: 0000000000000004
RBP: 00007f024d408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f024d616038 R14: 00007f024d615fa0 R15: 00007ffef4e04098
 </TASK>
