INFO: task kworker/u8:5:6707 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5    state:D stack:23560 pid:6707  tgid:6707  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 addrconf_dad_work+0x116/0x15c0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/u10:14:9944 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u10:14  state:D stack:25168 pid:9944  tgid:9944  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 linkwatch_event+0xe/0x60
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.0.6338:30726 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.6338      state:D stack:25320 pid:30726 tgid:30723 ppid:5602   task_flags:0x40054c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 tun_chr_close+0x3e/0x1c0
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x104/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c2359de99
RSP: 002b:00007f7c24495028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 0000000000000058 RBX: 00007f7c23826180 RCX: 00007f7c2359de99
RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000003
RBP: 00007f7c23633eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c23826218 R14: 00007f7c23826180 R15: 00007ffe3b251738
 </TASK>
INFO: task syz.2.6339:30729 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.6339      state:D stack:25992 pid:30729 tgid:30727 ppid:5610   task_flags:0x40044c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 tun_chr_close+0x3e/0x1c0
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x104/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86b899de99
RSP: 002b:00007f86b98d0028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: 0000000000000012 RBX: 00007f86b8c26090 RCX: 00007f86b899de99
RDX: 0000000000000012 RSI: 0000200000000c40 RDI: 0000000000000004
RBP: 00007f86b8a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000008800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f86b8c26128 R14: 00007f86b8c26090 R15: 00007ffc1a4f84c8
 </TASK>
INFO: task syz.1.6340:30732 blocked for more than 143 seconds.
      Not tainted syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.6340      state:D stack:24424 pid:30732 tgid:30731 ppid:5606   task_flags:0x40054c flags:0x00080001
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 tun_chr_close+0x3e/0x1c0
 __fput+0x418/0xa50
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x104/0x730
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f212799de99
RSP: 002b:00007f2125bf6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 000000000000003c RBX: 00007f2127c25fa0 RCX: 00007f212799de99
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000003
RBP: 00007f2127a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2127c26038 R14: 00007f2127c25fa0 R15: 00007ffe4dede168
 </TASK>
INFO: task syz-executor:30739 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21568 pid:30739 tgid:30739 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 ieee80211_register_hw+0x3881/0x4a50
 mac80211_hwsim_new_radio+0x3238/0x5680
 hwsim_new_radio_nl+0xd8b/0xf90
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bb/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 __sys_sendto+0x408/0x5a0
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f448b75e6ce
RSP: 002b:00007ffc10675588 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555575ebc500 RCX: 00007f448b75e6ce
RDX: 0000000000000024 RSI: 00007f448c554670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffc10675604 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f448c554670 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:30757 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:22408 pid:30757 tgid:30757 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 rtnl_getlink+0xb9a/0x1260
 rtnetlink_rcv_msg+0x802/0xc00
 netlink_rcv_skb+0x226/0x4a0
 netlink_unicast+0x7bb/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 __sys_sendto+0x408/0x5a0
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff1e2b5e6ce
RSP: 002b:00007fff10693048 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000555589996500 RCX: 00007ff1e2b5e6ce
RDX: 0000000000000020 RSI: 00007ff1e3954670 RDI: 0000000000000005
RBP: 0000000000000001 R08: 00007fff106930c4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00007fff1069312c R14: 00007ff1e3954670 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:2/33:
 #0: ffff888100069d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000a97c40 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0xac/0x1110
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5431:
 #0: ffff888175a810a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
3 locks held by kworker/1:3/5660:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900065e7c40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
3 locks held by kworker/u8:5/6707:
 #0: ffff88817505a140 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90007f57c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x116/0x15c0
3 locks held by kworker/u10:14/9944:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90003bafc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
4 locks held by kworker/0:11/18179:
1 lock held by syz.0.6338/30726:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
1 lock held by syz.2.6339/30729:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
1 lock held by syz.1.6340/30732:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
3 locks held by syz-executor/30739:
 #0: ffffffff9009d8a8 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff9009d6e0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0
 #2: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_register_hw+0x3881/0x4a50
1 lock held by syz-executor/30757:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_getlink+0xb9a/0x1260
2 locks held by syz.3.6344/30868:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30
 #1: ffffffff900d1680 (flowtable_lock){+.+.}-{4:4}, at: nf_flow_table_cleanup+0x21/0xb0
1 lock held by syz-executor/30873:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30881:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30889:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30899:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30907:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30915:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30923:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30931:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0
1 lock held by syz-executor/30937:
 #0: ffffffff9002d040 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x470/0x19f0

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

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/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 18179 Comm: kworker/0:11 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
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
RIP: 0010:lock_acquire+0x221/0x350
Code: ff ff ff e8 61 af 2d 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 4b 5a ca 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d d8 93 b8
RSP: 0018:ffffc90000007bd0 EFLAGS: 00000282
RAX: 0353c41dcda2b000 RBX: 0000000000000000 RCX: 0000000000000101
RDX: 000000006c6d90ec RSI: ffffffff8e4b240c RDI: ffffffff8c4bda80
RBP: ffffffff89a531d3 R08: ffffffff89a531d3 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88812103cd28 R12: 0000000000000000
R13: ffff88812103cd28 R14: 0000000000000001 R15: 0000000000000246
FS:  0000000000000000(0000) GS:ffff88818d958000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000373030 CR3: 000000000e946000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 process_backlog+0x927/0x1860
 __napi_poll+0xaa/0x330
 net_rx_action+0x61d/0xf50
 handle_softirqs+0x225/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__schedule+0x1da2/0x56c0
Code: 31 f6 e8 61 2b c4 f5 4c 89 ff e8 d9 37 c5 f5 0f 1f 44 00 00 49 83 c7 48 4c 89 ff e8 08 c1 01 00 e8 33 e0 fd f5 fb 4c 8b 24 24 <e9> 3a fa ff ff 90 0f 0b 90 f7 c6 01 01 00 00 0f 85 2a e8 ff ff e9
RSP: 0018:ffffc900076b7500 EFLAGS: 00000206
RAX: 000000000061098d RBX: 1ffff92000ed6ec4 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8e22d598 RDI: ffffffff8c4bda80
RBP: ffffc900076b76f0 R08: ffffffff905785f7 R09: 1ffffffff20af0be
R10: dffffc0000000000 R11: fffffbfff20af0bf R12: ffff88811e0dbb80
R13: dffffc0000000000 R14: ffff88811e0dbb80 R15: ffff88812103b148
 preempt_schedule_common+0x82/0xd0
 preempt_schedule_thunk+0x16/0x40
 _raw_spin_unlock_irqrestore+0x74/0x80
 debug_check_no_obj_freed+0x39e/0x450
 kmem_cache_free+0xfd/0x650
 wg_packet_handshake_receive_worker+0x899/0x10c0
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
