INFO: task kworker/u8:1:13 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1    state:D stack:23104 pid:13    tgid:13    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 wait_for_completion+0x2ca/0x5e0
 __flush_workqueue+0x709/0x1470
 drain_workqueue+0xce/0x380
 destroy_workqueue+0xbb/0xc60
 wg_destruct+0x1a0/0x310
 netdev_run_todo+0xeff/0x10d0
 default_device_exit_batch+0x966/0x9e0
 ops_undo_list+0x4b4/0x8d0
 cleanup_net+0x572/0x810
 process_scheduled_works+0xa8e/0x14e0
 worker_thread+0xa47/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by kworker/R-rcu_g/4:
2 locks held by kworker/0:0/9:
2 locks held by kworker/0:1/10:
4 locks held by kworker/u8:1/13:
 #0: ffff8881012d5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff90018348 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffff88816fbe5610 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x116/0x310
1 lock held by kworker/R-mm_pe/14:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390
2 locks held by kworker/1:0H/25:
 #0: ffff888102ae2540 ((wq_completion)kblockd){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900001f7c40 ((work_completion)(&q->timeout_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u10:2/63:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000175fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by kworker/0:2/472:
2 locks held by kworker/u10:12/1119:
 #0: ffff8881000ac140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc90006e57c40 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
2 locks held by getty/5425:
 #0: ffff8881753bf0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
1 lock held by kworker/R-wg-cr/5654:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390
1 lock held by kworker/R-wg-cr/5656:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
2 locks held by kworker/0:3/5671:
1 lock held by kworker/0:4/5672:
2 locks held by kworker/0:5/5686:
3 locks held by kworker/1:6/9628:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc9000295fc40 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by kworker/R-wg-cr/10108:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
1 lock held by kworker/R-wg-cr/10109:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
1 lock held by kworker/R-wg-cr/10110:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
2 locks held by kworker/0:6/10571:
1 lock held by kworker/R-wg-cr/10735:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390
1 lock held by kworker/R-wg-cr/10736:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
7 locks held by kworker/R-wg-cr/10739:
1 lock held by kworker/R-wg-cr/10740:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
2 locks held by kworker/R-wg-cr/10741:
1 lock held by kworker/R-wg-cr/10742:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390
1 lock held by kworker/R-wg-cr/10743:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
1 lock held by kworker/R-wg-cr/10744:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0xbda/0x10b0
1 lock held by udevd/11164:
 #0: ffff88816cb8d350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xde/0xd70
1 lock held by kworker/R-wg-cr/12105:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: worker_attach_to_pool+0x31/0x390
2 locks held by kworker/R-wg-cr/12114:
2 locks held by kworker/R-wg-cr/12116:
1 lock held by syz.8.1651/12383:
 #0: ffff888174193860 (&ep->mtx){+.+.}-{4:4}, at: eventpoll_release_file+0xac/0x2f0
1 lock held by kworker/R-nfc2_/12437:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x80/0x10b0
1 lock held by kworker/R-nfc2_/12438:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x80/0x10b0
1 lock held by kworker/R-nfc2_/12439:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x80/0x10b0
1 lock held by kworker/R-bond3/12466:
 #0: ffffffff8e9f6ea0 (wq_pool_attach_mutex){+.+.}-{4:4}, at: rescuer_thread+0x80/0x10b0
1 lock held by syz.7.1676/12491:
 #0: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

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

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: 10739 Comm: kworker/R-wg-cr 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-crypt-wg0 wg_packet_decrypt_worker
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 00 fa 5b 0a cc 89 f6 31 d2 e9 36 91 9a 03 66 0f 1f 44 00
RSP: 0000:ffffc90000006d90 EFLAGS: 00000046
RAX: 00000000000000a2 RBX: ffff888121023c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 00000000000000a2 RDI: 0000000000000838
RBP: ffffc90000006e50 R08: ffffffff81b3fb45 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff8174d530 R12: 00000000000000a2
R13: dffffc0000000000 R14: 0000000010004824 R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff88818d95e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32f1eff8 CR3: 000000000e946000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x26c/0x420
 irqentry_exit+0x8b7/0x8f0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x10/0xb0
Code: 66 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 f3 0f 1e fa 41 57 41 56 53 65 ff 05 a0 3f c0 11 <e8> cb 31 23 0a 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df
RSP: 0000:ffffc90000006fa0 EFLAGS: 00000282
RAX: ffffffff8a97c709 RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff88816c7c1dc0 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000070d8 R08: ffff88816c7c1dc0 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000100 R12: 1ffff92000000e00
R13: ffffc90000007020 R14: dffffc0000000000 R15: 0000000000000001
 __ip6_local_out+0x853/0x940
 ip6_local_out+0x2a/0x190
 synproxy_send_tcp_ipv6+0x549/0x700
 synproxy_send_client_synack_ipv6+0x83f/0xcd0
 nft_synproxy_eval_v6+0x362/0x4e0
 nft_synproxy_do_eval+0x3d1/0x550
 nft_do_chain+0x48d/0x1b10
 nft_do_chain_inet+0x360/0x4b0
 nf_hook_slow+0xc5/0x220
 NF_HOOK+0x21f/0x3c0
 ip6_input+0x16a/0x270
 NF_HOOK+0x336/0x3c0
 process_backlog+0x774/0x1860
 __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:__crypto_xor+0x27f/0xd10
Code: e8 66 f5 f2 fc e9 82 06 00 00 41 83 c4 e0 45 31 ed 4b 8d 3c 2f 48 89 f8 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df 0f b6 04 10 <84> c0 0f 85 ba 02 00 00 4b 8d 3c 2f 48 83 c7 07 48 89 f8 48 c1 e8
RSP: 0000:ffffc90004ea70a0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffc90004ea74e0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000018 RDI: ffff88800bf96000
RBP: 0000000000000018 R08: ffffc90004ea705f R09: 0000000000000000
R10: ffffc90004ea7020 R11: fffff520009d4e0c R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90004ea7140 R15: ffff88800bf96000
 chacha_crypt+0xf24/0xf90
 chacha20poly1305_crypt_sg_inplace+0x4bf/0xea0
 chacha20poly1305_decrypt_sg_inplace+0x5a/0x80
 wg_packet_decrypt_worker+0x5e4/0xda0
 process_scheduled_works+0xa8e/0x14e0
 rescuer_thread+0x7b6/0x10b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
