INFO: task kworker/u8:1:13 blocked for more than 150 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:23680 pid:13    tgid:13    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 addrconf_verify_work+0x19/0x30
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task kworker/1:6:7957 blocked for more than 152 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:6     state:D stack:21864 pid:7957  tgid:7957  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient reg_check_chans_work
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:1/32:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by syslogd/5240:
1 lock held by klogd/5247:
1 lock held by udevd/5258:
1 lock held by dhcpcd/5553:
6 locks held by dhcpcd/5554:
2 locks held by getty/5632:
 #0: ffff88810f3850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034002f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
1 lock held by syz-executor/5733:
8 locks held by kworker/0:3/5815:
3 locks held by kworker/1:6/7957:
4 locks held by udevd/11640:
 #0: ffff88819b601b08 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88816eef7488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff888114f4e968 (kn->active#27){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff888110086198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
2 locks held by udevd/11677:
2 locks held by udevd/11703:
2 locks held by syz-executor/14486:
2 locks held by syz-executor/15185:
 #0: ffff888178438ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_unregister_dev+0x212/0x5a0
 #1: ffff8881784380c0 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x640/0x10e0
2 locks held by syz.5.1976/15189:
 #0: ffffffff8fbd1088 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
 #1: ffffffff8e764838 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
2 locks held by syz-executor/15995:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 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+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 14486 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:unwind_get_return_address+0x67/0x90
Code: 48 89 df e8 8b 4c b8 00 48 8b 3b e8 83 61 19 00 85 c0 74 14 43 80 3c 37 00 74 08 48 89 df e8 70 4c b8 00 48 8b 03 eb 02 31 c0 <5b> 41 5e 41 5f c3 cc cc cc cc cc 89 d9 80 e1 07 80 c1 03 38 c1 7c
RSP: 0018:ffffc9000635f388 EFLAGS: 00000246
RAX: ffffffff82235228 RBX: ffffc9000635f3f0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8e16c921 RDI: ffffffff82235228
RBP: ffffc9000635f430 R08: ffffc9000635f7e0 R09: 0000000000000000
R10: ffffc9000635f3f8 R11: fffff52000c6be81 R12: ffff888171989d40
R13: 1ffff1102e331466 R14: dffffc0000000000 R15: 1ffff92000c6be7e
FS:  00005555667e0500(0000) GS:ffff8882a9465000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7409144020 CR3: 000000017875e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 arch_stack_walk+0xfb/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc7/0xd30
 __slab_free+0x263/0x2b0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_node_noprof+0x498/0x7c0
 __vmalloc_node_range_noprof+0x5ef/0x1750
 vzalloc_noprof+0xb2/0xe0
 __do_replace+0xb3/0x990
 do_ipt_set_ctl+0xb45/0xe00
 nf_setsockopt+0x26f/0x290
 do_sock_setsockopt+0x17c/0x1b0
 __x64_sys_setsockopt+0x13d/0x1b0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe3b7b9dfda
Code: 48 83 ec 10 48 63 c9 48 63 ff 45 89 c9 6a 2c e8 6c 99 fb ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffceb302068 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffceb3020f0 RCX: 00007fe3b7b9dfda
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000002d8 R09: ffff000000000000
R10: 00007fe3b7dea020 R11: 0000000000000206 R12: 00007fe3b7de9fc0
R13: 00007ffceb30208c R14: 0000000000000000 R15: 00007fe3b7dec180
 </TASK>
