INFO: task kworker/u8:1:13 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1    state:D stack:23664 pid:13    tgid:13    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c0/0x12d0
 unregister_netdevice_notifier_net+0x87/0x2f0
 nsim_dev_hwstats_exit+0x7a/0x2d0
 nsim_dev_reload_destroy+0x2af/0x490
 nsim_dev_reload_down+0x8a/0xc0
 devlink_reload+0x1aa/0x870
 devlink_pernet_pre_exit+0x1e6/0x3f0
 ops_undo_list+0x17d/0x8d0
 cleanup_net+0x572/0x810
 process_scheduled_works+0xa2f/0x1470
 worker_thread+0xa44/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/u8:3:5666 blocked for more than 151 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:25008 pid:5666  tgid:5666  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c0/0x12d0
 addrconf_dad_work+0x116/0x15c0
 process_scheduled_works+0xa2f/0x1470
 worker_thread+0xa44/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:0/9:
6 locks held by kworker/u8:1/13:
 #0: ffff8881012c6148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90000127c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8fbd3850 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810
 #3: ffff8881116470e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x117/0x3f0
 #4: ffff888111646250 (&devlink->lock_key#3){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x3f0
 #5: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: unregister_netdevice_notifier_net+0x87/0x2f0
5 locks held by kworker/u9:0/26:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75d000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u10:3/64:
 #0: ffff8881000ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc9000176fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
2 locks held by kworker/u9:2/899:
3 locks held by kworker/1:3/978:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc900069afc40 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
1 lock held by klogd/5031:
4 locks held by udevd/5042:
1 lock held by dhcpcd/5337:
1 lock held by dhcpcd/5338:
2 locks held by getty/5420:
 #0: ffff888113dca0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
1 lock held by syz-executor/5579:
1 lock held by syz-executor/5591:
 #0: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
2 locks held by kworker/0:4/5660:
3 locks held by kworker/u8:3/5666:
 #0: ffff888172ab1948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90006627c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x116/0x15c0
2 locks held by syz-executor/9232:
 #0: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
 #1: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
1 lock held by syz-executor/9341:
 #0: ffffffff8fbe1fc8 (rtnl_mutex){+.+.}-{4:4}, at: inet6_rtm_newaddr+0x65e/0xdf0
1 lock held by syz-executor/9426:
2 locks held by syz-executor/9429:
3 locks held by dhcpcd/9431:
2 locks held by syz-executor/9433:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xf9e/0xff0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 9429 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__slab_free+0x10f/0x2b0
Code: 4c 89 f7 48 8d 74 24 40 48 8d 54 24 30 e8 f9 79 00 00 89 c3 eb 4a 48 8b 44 24 40 48 8b 54 24 48 48 8b 5c 24 30 48 8b 4c 24 38 <f0> 49 0f c7 4e 20 0f 84 86 00 00 00 48 89 44 24 40 48 89 54 24 48
RSP: 0018:ffffc900070ff870 EFLAGS: 00000202
RAX: ffff888067fe5700 RBX: ffff888067fe5600 RCX: 0000000800100002
RDX: 0000000800100003 RSI: ffff888067fe5600 RDI: 0000000000000000
RBP: ffffc900070ff8f8 R08: 0000000000000001 R09: ffffffff822f606d
R10: dffffc0000000000 R11: ffffed1024208179 R12: 0000000000000000
R13: ffff8881667acb40 R14: ffffea00019ff940 R15: ffff888067fe5700
FS:  0000555579bc1500(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f62f08f6000 CR3: 000000019365a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 qlist_free_all+0x98/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_lru_noprof+0x2b4/0x640
 ext4_alloc_inode+0x2e/0x560
 alloc_inode+0x6a/0x1b0
 new_inode+0x1f/0x170
 __ext4_new_inode+0x313/0x3e10
 ext4_mkdir+0x434/0xc70
 vfs_mkdir+0x406/0x620
 filename_mkdirat+0x285/0x510
 __se_sys_mkdir+0x34/0x150
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f62ef9cb3e7
Code: 94 c0 48 8b 54 24 48 64 48 2b 14 25 28 00 00 00 75 08 0f b6 c0 48 83 c4 58 c3 e8 44 51 fd ff 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffdc252ae08 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffdc252af32 RCX: 00007f62ef9cb3e7
RDX: 000000000f7376ae RSI: 00000000000001c0 RDI: 00007ffdc252af20
RBP: 8421084210842109 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000f7376ae
R13: 00007ffdc252af32 R14: 0000000000000004 R15: 00007f62efa5b220
 </TASK>
