INFO: task kworker/u8:0:12 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:0    state:D stack:22728 pid:12    tgid:12    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 addrconf_dad_work+0x11e/0x14c0
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.5.560:7878 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.560       state:D stack:28312 pid:7878  tgid:7877  ppid:7458   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 perf_trace_init+0x50/0x2d0
 perf_tp_event_init+0x8d/0x120
 perf_try_init_event+0x17f/0x870
 perf_event_alloc+0x1489/0x2e40
 __se_sys_perf_event_open+0x7a9/0x1d60
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98f899acb9
RSP: 002b:00007f98f98b0028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f98f8c15fa0 RCX: 00007f98f899acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f98f8a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98f8c16038 R14: 00007f98f8c15fa0 R15: 00007ffcf7ecc0e8
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
 #0: ffff8881699bd948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000117bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
4 locks held by kworker/u9:0/26:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90000a17bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
 #3: ffffffff8e360cb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a3a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
6 locks held by kworker/u11:0/55:
 #0: ffff8881a282e948 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc9000141fbc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88818bca0ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88818bca00c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
 #5: ffff888191074b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x7b/0x5b0
5 locks held by kworker/u11:1/5225:
 #0: ffff88816a81c148 ((wq_completion)hci1){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc9000246fbc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88801bdc0ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88801bdc00c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
2 locks held by getty/5661:
 #0: ffff8881151370a0 (&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/u11:2/5834:
 #0: ffff888175d04948 ((wq_completion)hci4){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90005047bc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88817343cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88817343c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
4 locks held by kworker/u8:3/5859:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900051e7bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffffffff8f79ac10 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x7b0
 #3: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: wg_netns_pre_exit+0x1c/0x200
5 locks held by kworker/u11:3/7662:
 #0: ffff8881a98f8148 ((wq_completion)hci5){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900035a7bc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881743c4ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff8881743c40c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
3 locks held by syz.4.553/7832:
 #0: ffffffff99e02ab8 (&pmus_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x2c/0x60
 #1: ffffffff99e02ab8 (&pmus_srcu){.+.+}-{0:0}, at: perf_event_alloc+0x109a/0x2e40
 #2: ffffffff8e3c9d08 (event_mutex){+.+.}-{4:4}, at: perf_trace_init+0x50/0x2d0
4 locks held by syz.4.553/7844:
2 locks held by syz.6.559/7861:
 #0: ffffffff99e02ab8 (&pmus_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x2c/0x60
 #1: ffffffff8e3c9d08 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x2e/0x150
3 locks held by syz.5.560/7878:
 #0: ffffffff99e02ab8 (&pmus_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x2c/0x60
 #1: ffffffff99e02ab8 (&pmus_srcu){.+.+}-{0:0}, at: perf_event_alloc+0x109a/0x2e40
 #2: ffffffff8e3c9d08 (event_mutex){+.+.}-{4:4}, at: perf_trace_init+0x50/0x2d0
1 lock held by syz-executor/7882:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
2 locks held by syz-executor/7893:
 #0: ffffffff8f79ac10 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x3cb/0x570
 #1: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x1a/0xa0
1 lock held by syz-executor/7897:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/7902:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/7908:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/7911:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by dhcpcd/7916:
 #0: ffff88811e8b1408 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/7917:
 #0: ffff8881167bc408 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/7918:
 #0: ffff8881aa140208 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by dhcpcd/7919:
 #0: ffff8881aa142008 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
2 locks held by dhcpcd/7920:
 #0: ffff8881aa143208 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
 #1: ffffffff8e360cb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by dhcpcd/7921:
 #0: ffff88819c2fc260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0
4 locks held by kworker/u11:5/7923:
 #0: ffff88819351e148 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90003837bc0 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881bcfa40c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950
1 lock held by syz-executor/7925:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
1 lock held by syz-executor/7930:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
4 locks held by kworker/u11:6/7931:
 #0: ffff88816b87b948 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900036d7bc0 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881a650c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950
5 locks held by kworker/u11:7/7933:
 #0: ffff88811fb51948 ((wq_completion)hci0){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900036c7bc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff888104738ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff8881047380c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
5 locks held by kworker/u11:9/7935:
 #0: ffff88802a884148 ((wq_completion)hci3){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc900036b7bc0 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88819101cec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
 #3: ffff88819101c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x8a3/0xed0
 #4: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x165/0x340
1 lock held by syz-executor/7937:
 #0: ffffffff8f7a9288 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x404/0x1ad0
4 locks held by kworker/u11:10/7940:
 #0: ffff88819963e148 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90003667bc0 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff8881a940c0c0 (&hdev->lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x9b/0x950
 #3: ffffffff8f934f08 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_remote_features_evt+0x54c/0x950

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

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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 7844 Comm: syz.4.553 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:cfg80211_update_known_bss+0x2ae/0x1590
Code: 8d b8 68 01 00 00 be ff ff ff ff e8 cc b8 af 00 89 c3 31 ff 89 c6 e8 a1 83 f9 f6 85 db 0f 84 cc 08 00 00 e8 54 7f f9 f6 eb 2b <e8> 4d 7f f9 f6 e9 d7 01 00 00 e8 43 7f f9 f6 4c 8b 2c 24 e9 c9 01
RSP: 0018:ffffc90000007170 EFLAGS: 00000246
RAX: 1ffff11023c2e396 RBX: ffffc90000007440 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000100 R12: 1ffff92000000e88
R13: ffffc900000073c0 R14: ffff88811e171cb0 R15: 0000000000000000
FS:  00007f0a36d906c0(0000) GS:ffff88818e328000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a0e06cbde8 CR3: 000000011358c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __cfg80211_bss_update+0x147/0x2110
 cfg80211_inform_single_bss_data+0xbc4/0x1ab0
 cfg80211_inform_bss_data+0x233/0x3bb0
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_scan_rx+0x593/0xa20
 ieee80211_rx_list+0x2508/0x3050
 ieee80211_rx_napi+0x1b1/0x3e0
 ieee80211_handle_queued_frames+0xe8/0x1e0
 tasklet_action_common+0x2da/0x4b0
 handle_softirqs+0x22a/0x7c0
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:trace_sched_exit_tp+0x0/0xf0
Code: 8c 83 fe ff ff 48 8b 7d b0 e8 ec 4d 97 00 e9 75 fe ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 53 66 90 65 8b 05 29 94 3c 11 83 f8 08 73 32 89 c3 c1 e8 06 48
RSP: 0018:ffffc90008ddf718 EFLAGS: 00000246
RAX: 000000000041b587 RBX: ffff888101f38000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dad37f0 RDI: 0000000000000000
RBP: ffffc90008ddf910 R08: ffffffff8fced877 R09: 1ffffffff1f9db0e
R10: dffffc0000000000 R11: fffffbfff1f9db0f R12: dffffc0000000000
R13: ffff888101f38000 R14: ffff88812103b470 R15: 1ffff11024207680
 __schedule+0x1505/0x4fb0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x597/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_common+0x11/0xd0
Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df eb 0d <48> f7 03 10 00 00 00 0f 84 99 00 00 00 65 ff 05 fb 82 55 07 65 8b
RSP: 0018:ffffc90008ddfa48 EFLAGS: 00000246
RAX: 1ffff110203e7000 RBX: ffff888101f38000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8be74060 RDI: ffffffff8be74020
RBP: ffffc90008ddfab0 R08: ffffffff8fced877 R09: 1ffffffff1f9db0e
R10: dffffc0000000000 R11: fffffbfff1f9db0f R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888101f39520 R15: dffffc0000000000
 preempt_schedule_thunk+0x16/0x30
 smp_call_function_single+0x469/0x580
 perf_install_in_context+0x5c0/0x930
 __se_sys_perf_event_open+0x192f/0x1d60
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0a35f9acb9
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:00007f0a36d90028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f0a36216180 RCX: 00007f0a35f9acb9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000012c0
RBP: 00007f0a36008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0a36216218 R14: 00007f0a36216180 R15: 00007ffeb447d8b8
 </TASK>
