INFO: task syz.0.2232:17296 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2232      state:D stack:28824 pid:17296 tgid:17292 ppid:16003  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 path_openat+0xb4c/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbab079c819
RSP: 002b:00007fbab16cb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fbab0a16090 RCX: 00007fbab079c819
RDX: 000000000000275a RSI: 0000200000000580 RDI: ffffffffffffff9c
RBP: 00007fbab0832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbab0a16128 R14: 00007fbab0a16090 R15: 00007fff06b56ba8
 </TASK>
INFO: task syz.0.2232:17298 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2232      state:D stack:28672 pid:17298 tgid:17292 ppid:16003  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x899/0x1040
 down_write+0x1bc/0x200
 path_openat+0xb4c/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbab079c819
RSP: 002b:00007fbab16aa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fbab0a16180 RCX: 00007fbab079c819
RDX: 000000000000275a RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007fbab0832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbab0a16218 R14: 00007fbab0a16180 R15: 00007fff06b56ba8
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u10:0/27:
 #0: ffff888103bba148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90000a27c40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
1 lock held by khungtaskd/35:
 #0: ffffffff8e75e5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u10:4/1094:
 #0: ffff888162681148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc900062afc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff8881186f20e0 (&type->s_umount_key#88){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff88811f641d40 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5633:
 #0: ffff88816cf2e0a0 (&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
3 locks held by kworker/u8:2/5667:
 #0: ffff888111ee3948 ((wq_completion)ipv6_addrconf
){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90005ecfc40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbd0a88 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
6 locks held by kworker/1:3/5813:
 #0: ffff8881056fd148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000681fc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88816c01c1e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8881b8aaa1e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff8881a785a1a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #5: ffff8881a41ac0d0 (&d->usb_mutex){+.+.}-{4:4}, at: rtl28xxu_ctrl_msg+0x59/0x690
3 locks held by kworker/u8:3/5839:
 #0: ffff88816cd63148 ((wq_completion)udp_tunnel_nic){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000696fc40 ((work_completion)(&utn->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbd0a88 (rtnl_mutex){+.+.}-{4:4}, at: udp_tunnel_nic_device_sync_work+0x29/0xa10
3 locks held by kworker/0:4/5860:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006b1fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888117820240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
4 locks held by udevd/6142:
 #0: ffff88818de2ac30 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff8881727fe888 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff8881b9f24968 (kn->active#26){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881b8aaa1e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
4 locks held by syz.0.2232/17293:
2 locks held by syz.0.2232/17296:
 #0: ffff8881186f2420 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811f6420f0 (&type->i_mutex_dir_key#20){++++}-{4:4}, at: path_openat+0xb4c/0x3860
2 locks held by syz.0.2232/17298:
 #0: ffff8881186f2420 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811f6420f0 (&type->i_mutex_dir_key#20){++++}-{4:4}, at: path_openat+0xb4c/0x3860
3 locks held by syz-executor/20287:
 #0: ffffffff8fbd0a88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a1/0x1be0
 #1: ffff8881186ed568 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420
 #2: ffffffff8e7648b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
3 locks held by syz.3.2764/20413:
 #0: ffff888118c6a420 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88811f5dd548 (&type->i_mutex_dir_key#14/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
 #2: ffff88811f5dd9f8 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd3/0x120

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

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+0xfd9/0x1030
 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: 5667 Comm: kworker/u8:2 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
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:__ipv6_neigh_lookup_noref+0x245/0x710
Code: f7 48 8b 2b 48 85 ed 4c 8b 74 24 30 0f 84 ff 02 00 00 4c 89 6c 24 38 48 8d 9d 20 03 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 71 8d de f7 4c 39 33 74 0a e8 17 3b 74 f7 e9 57
RSP: 0018:ffffc90005ecf558 EFLAGS: 00000246
RAX: 1ffff1103765c964 RBX: ffff8881bb2e4b20 RCX: ffff888110e00000
RDX: 0000000000000000 RSI: 0000000000000016 RDI: 0000000000000020
RBP: ffff8881bb2e4800 R08: ffff88811da5410f R09: 1ffff11023b4a821
R10: dffffc0000000000 R11: ffffed1023b4a822 R12: 0000000000000000
R13: ffff88811d995c28 R14: ffff88816d184000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88818de54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005645a2553000 CR3: 000000011e59c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ip6_finish_output2+0x467/0x13e0
 ip6_output+0x340/0x550
 ndisc_send_skb+0xd0b/0x1670
 addrconf_dad_completed+0x909/0xe60
 addrconf_dad_work+0xc5e/0x14c0
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
