INFO: task kworker/u10:7:2055 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:7   state:D stack:24344 pid:2055  tgid:2055  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ib-unreg-wq ib_unregister_work
Call Trace:
 <TASK>
 __schedule+0x14bc/0x5000
 schedule+0x165/0x360
 schedule_timeout+0x9a/0x270
 wait_for_completion+0x2bf/0x5d0
 disable_device+0x1c6/0x320
 __ib_unregister_device+0x2cb/0x3f0
 ib_unregister_work+0x19/0x30
 process_scheduled_works+0xad1/0x1770
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x599/0xb30
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8df41a20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:6/754:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90005827b80 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f311d08 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
 #3: ffffffff8df47578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
3 locks held by kworker/u10:7/2055:
 #0: ffff888105ec9148 ((wq_completion)ib-unreg-wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc9000a41fb80 ((work_completion)(&device->unregistration_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff88818c408700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x284/0x3f0
3 locks held by kworker/u10:9/4294:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90021fcfb80 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff8881141a8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xb4/0x450
5 locks held by kworker/u11:1/5218:
 #0: ffff8881745fe948 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc900202afb80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff88810d6e8ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88810d6e80c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x242/0xe30
 #4: ffffffff8f483788 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
2 locks held by getty/5655:
 #0: ffff888175af70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460
6 locks held by kworker/u11:2/5831:
 #0: ffff888173e4f148 ((wq_completion)hci1){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90005247b80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff888172cc0ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff888172cc00c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x242/0xe30
 #4: ffffffff8f483788 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
 #5: ffff888173e48338 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0
4 locks held by kworker/u11:4/5839:
 #0: ffff88811360e948 ((wq_completion)hci3#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90005297b80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff888111ae00c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x920
 #3: ffffffff8f483788 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x51c/0x920
3 locks held by kworker/u8:3/5860:
 #0: ffff888111e55148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc900053c7b80 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f311d08 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30
4 locks held by kworker/u8:5/5966:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc900042a7b80 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffffffff8f304c70 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x7a0
 #3: ffffffff8df47440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
2 locks held by syz.8.2057/13576:
 #0: ffffffff8f304c70 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cc/0x570
 #1: ffff88818c408700 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x39/0x300
2 locks held by syz.3.2073/13644:
 #0: ffffffff8dfa9128 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x2e/0x150
 #1: ffffffff8df47578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
4 locks held by syz.3.2073/13645:
1 lock held by syz.7.2074/13646:
 #0: ffffffff8dfa9128 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x2e/0x150
1 lock held by syz-executor/13652:
 #0: ffffffff8f311d08 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
1 lock held by syz-executor/13657:
 #0: ffffffff8f311d08 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
4 locks held by kworker/u11:3/13658:
 #0: ffff88811c1e9148 ((wq_completion)hci4#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc90003357b80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff8880119200c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x920
 #3: ffffffff8f483788 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x51c/0x920
1 lock held by syz-executor/13661:
 #0: ffffffff8f311d08 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0
4 locks held by kworker/u11:5/13662:
 #0: ffff88811b6d1148 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x1770
 #1: ffffc900041cfb80 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x1770
 #2: ffff88801e2480c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x920
 #3: ffffffff8f483788 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x51c/0x920

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

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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf95/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x599/0xb30
 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: 13645 Comm: syz.3.2073 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:native_apic_msr_eoi+0xf/0x20
Code: f8 c3 cc cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa b9 0b 08 00 00 31 c0 31 d2 0f 30 <e9> 7c f3 eb 09 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90000a081b0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90000a081e8 RCX: 000000000000080b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffff88823c62404f R09: 1ffff110478c4809
R10: dffffc0000000000 R11: ffffed10478c480a R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f61a08536c0(0000) GS:ffff8882a9e35000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e811ff8 CR3: 000000011d4aa000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __sysvec_irq_work+0x11/0x3a0
 sysvec_irq_work+0x4f/0xc0
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0010:unwind_next_frame+0x50f/0x23d0
Code: c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48
RSP: 0018:ffffc90000a08298 EFLAGS: 00000a07
RAX: 1ffffffff1f325eb RBX: ffffffff8f992f64 RCX: dffffc0000000000
RDX: ffffffff8f992f54 RSI: ffffffff90143658 RDI: ffffffff8bc08280
RBP: ffffffff8f992f54 R08: 0000000000000005 R09: ffffffff8df41a20
R10: ffffc90000a08418 R11: fffff52000141085 R12: ffffffff816ac883
R13: ffffffff8f992f54 R14: ffffc90000a083c8 R15: ffffffff8f992f5c
 __unwind_start+0x5b9/0x760
 arch_stack_walk+0xe4/0x150
 stack_trace_save+0x9c/0xe0
 ref_tracker_alloc+0x17d/0x460
 ___neigh_create+0xc9a/0x2230
 ip6_finish_output2+0x1175/0x1480
 ip6_output+0x340/0x550
 ndisc_send_skb+0xbce/0x1510
 addrconf_rs_timer+0x369/0x6a0
 call_timer_fn+0x16e/0x590
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x27d/0x850
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 ab 16 34 f6 e8 46 94 6c f6 fb bf 01 00 00 00 <e8> 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90001797a00 EFLAGS: 00000286
RAX: c9fab8f9ad464f00 RBX: 0000000000000000 RCX: c9fab8f9ad464f00
RDX: 0000000000000000 RSI: ffffffff8d792409 RDI: 0000000000000001
RBP: ffffc90001797aa0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee
R10: dffffc0000000000 R11: fffffbfff1f043ef R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920002f2f40
 irqentry_exit+0x5d8/0x660
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:wake_up_q+0xa6/0xd0
Code: 00 00 31 d2 e8 4b a4 00 00 4c 8d b3 98 f5 ff ff 4c 89 f7 be 04 00 00 00 e8 37 f4 96 00 b8 ff ff ff ff f0 0f c1 83 98 f5 ff ff <83> f8 01 74 88 7d 9c 4c 89 f7 be 03 00 00 00 e8 d6 f0 fd 02 eb 8d
RSP: 0018:ffffc90001797bb8 EFLAGS: 00000213
RAX: 0000000000000002 RBX: ffff888113606250 RCX: ffffffff819127f9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881136057e8
RBP: ffffc90001797cf0 R08: ffff8881136057eb R09: 1ffff110226c0afd
R10: dffffc0000000000 R11: ffffed10226c0afe R12: 0000000000000001
R13: 0000000000000001 R14: ffff8881136057e8 R15: dffffc0000000000
 futex_wake+0x4a0/0x560
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f619f98f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f61a08530e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f619fbe5fa8 RCX: 00007f619f98f7c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f619fbe5fac
RBP: 00007f619fbe5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f619fbe6038 R14: 00007fffb541ba70 R15: 00007fffb541bb58
 </TASK>
