INFO: task syz-executor:6297 blocked  for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24832 pid:6297  tgid:6297  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1585/0x5260
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 add_one_compat_dev+0xf0/0x650
 rdma_dev_init_net+0x243/0x2f0
 ops_init+0x35c/0x5c0
 setup_net+0x118/0x340
 copy_net_ns+0x3e2/0x570
 create_new_namespaces+0x3e7/0x6a0
 unshare_nsproxy_namespaces+0x11a/0x160
 ksys_unshare+0x4f4/0x900
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f97cf79bfa7
RSP: 002b:00007ffe31366208 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f97cfa15f40 RCX: 00007f97cf79bfa7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f97cfa167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffe31366448 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e5602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5630:
 #0: ffff8881135a20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by sshd/5785:
2 locks held by kworker/u8:2/5819:
4 locks held by kworker/u11:5/13433:
 #0: ffff88803824a148 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_one_work+0x855/0x1650
 #1: ffffc90008b17c40 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650
 #2: ffff8880434ce2f8 (&conn->lock#2){+.+.}-{4:4}, at: process_pending_rx+0x2c/0xd0
 #3: ffff8880434ce158 (&list->lock#11){....}-{3:3}, at: skb_dequeue+0x2d/0x160
3 locks held by kworker/0:15/30722:
 #0: ffff88810006b548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x1650
 #1: ffffc90005607c40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650
 #2: ffffffff8fd41268 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
3 locks held by kworker/0:16/30724:
 #0: ffff88810006b548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x1650
 #1: ffffc900055bfc40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650
 #2: ffffffff8fd41268 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
3 locks held by kworker/0:17/30726:
 #0: ffff88810006b548 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x855/0x1650
 #1: ffffc90005597c40 ((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650
 #2: ffffffff8fd41268 (ovs_mutex){+.+.}-{4:4}, at: ovs_dp_masks_rebalance+0x2f/0xe0
5 locks held by kworker/u8:1/4330:
 #0: ffff8881012ae148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x855/0x1650
 #1: ffffc90022c57c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650
 #2: ffffffff8f9b6af0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffffffff8fd41268 (ovs_mutex){+.+.}-{4:4}, at: ovs_exit_net+0xe4/0x7a0
 #4: ffffffff8e566440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
