INFO: task syz-executor.5:10056 blocked for more than 143 seconds.
      Not tainted 6.1.0-rc5-syzkaller-00144-g84368d882b96 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D
 stack:25416 pid:10056 ppid:3662   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5191 [inline]
 __schedule+0x8fc/0xda0 kernel/sched/core.c:6503
 schedule+0xcb/0x190 kernel/sched/core.c:6579
 schedule_timeout+0xac/0x300 kernel/time/timer.c:1911
 do_wait_for_common+0x3ea/0x560 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x46/0x60 kernel/sched/completion.c:138
 f2fs_issue_checkpoint+0x30a/0x4f0
 iterate_supers+0x137/0x1f0 fs/super.c:724
 ksys_sync+0xd5/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd93da8b639
RSP: 002b:00007fd93e737168 EFLAGS: 00000246
 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fd93dbabf80 RCX: 00007fd93da8b639
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd93dae6ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe7c52d13f R14: 00007fd93e737300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: 
ffffffff8d323ff0
 (rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: 
ffffffff8d3247f0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: ffffffff8d323e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
5 locks held by kworker/u4:3/46:
3 locks held by kworker/0:2/155:
 #0: ffff8880281ca138
 (
(wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: 
ffffc90002defd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: ffffffff8e47dec8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd8/0x16e0 net/ipv6/addrconf.c:4083
3 locks held by kworker/1:2/157:
 #0: ffff8880281ca138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: ffffc90002e0fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: ffffffff8e47dec8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd8/0x16e0 net/ipv6/addrconf.c:4083
2 locks held by getty/3310:
 #0: ffff888028ea1098 (&tty->ldisc_sem){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177
3 locks held by kworker/u4:10/8537:
 #0: 
ffff888018595938
 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: 
ffffc90004d9fd00
 (
(work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: 
ffff88808cb940e0
 (&type->s_umount_key
#77
){++++}-{3:3}
, at: trylock_super+0x1b/0xf0 fs/super.c:415
3 locks held by kworker/1:1/29554:
 #0: 
ffff888012864d38
 (
(wq_completion)events
){+.+.}-{0:0}
, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: 
ffffc900036efd00
 (
(work_completion)(&data->fib_event_work)
){+.+.}-{0:0}
, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: 
ffff88807e680240
 (
&data->fib_lock
){+.+.}-{3:3}
, at: nsim_fib_event_work+0x2df/0x58a0 drivers/net/netdevsim/fib.c:1489
3 locks held by kworker/1:4/30889:
 #0: 
ffff888012864d38
 (
(wq_completion)events
){+.+.}-{0:0}
, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262
 #1: 
ffffc900156efd00
 (
(linkwatch_work).work
){+.+.}-{0:0}
, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264
 #2: 
ffffffff8e47dec8
 (
rtnl_mutex
){+.+.}-{3:3}
, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
1 lock held by syz-executor.5/10056:
 #0: 
ffff88808cb940e0
 (
&type->s_umount_key
#77
){++++}-{3:3}
, at: iterate_supers+0xb0/0x1f0 fs/super.c:722
5 locks held by f2fs_ckpt-7:5/10057:
2 locks held by syz-executor.5/10131:
 #0: 
ffff88808cb940e0
 (
&type->s_umount_key
#77
){++++}-{3:3}
, at: iterate_supers+0xb0/0x1f0 fs/super.c:722
 #1: 
ffff8881478a67d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}
, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
, at: sync_inodes_sb+0x279/0xaa0 fs/fs-writeback.c:2704
3 locks held by syz-executor.5/10189:
 #0: 
ffffffff8e47dec8
 (
rtnl_mutex
){+.+.}-{3:3}
, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
, at: rtnetlink_rcv_msg+0x75d/0xe90 net/core/rtnetlink.c:6088
 #1: 
ffff888018b6d3e8
 (
&wg->device_update_lock
){+.+.}-{3:3}
, at: wg_open+0x1eb/0x3f0 drivers/net/wireguard/device.c:49
 #2: 
ffffffff8d3293b8
 (
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
, at: synchronize_rcu_expedited+0x3a6/0x890 kernel/rcu/tree_exp.h:946

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc5-syzkaller-00144-g84368d882b96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e3/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x19b/0x3e0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xcf5/0xd40 kernel/hung_task.c:377
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 10189 Comm: syz-executor.5 Not tainted 6.1.0-rc5-syzkaller-00144-g84368d882b96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:rcu_rdp_cpu_online kernel/rcu/tree.c:235 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x9e/0x120 kernel/rcu/tree.c:774
Code: ac 03 00 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 c6 6c 6c 00 4c 8b 7b 20 48 83 c3 18 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 a8 6c 6c 00 48 8b 1b 48 83 c3 70 48 89 d8 48 c1
RSP: 0018:ffffc9000aec71e0 EFLAGS: 00000246
RAX: 1ffff11017327593 RBX: ffff8880b993ac98 RCX: 0000000080000200
RDX: 0000000000000000 RSI: ffffffff8b6b0d20 RDI: ffff8880b993aca0
RBP: ffffc9000aec7298 R08: ffffffff8969c36d R09: fffffbfff20e862a
R10: fffffbfff20e862a R11: 1ffffffff20e8629 R12: ffffc9000aec7560
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000000002
FS:  00005555558bb400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000880fa0 CR3: 0000000099e41000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_bh_held+0x7a/0x110 kernel/rcu/update.c:334
 addrconf_verify_rtnl+0x198/0x1230 net/ipv6/addrconf.c:4512
 inet6_addr_add+0x744/0xa00 net/ipv6/addrconf.c:2992
 inet6_rtm_newaddr+0x839/0x1ff0 net/ipv6/addrconf.c:4927
 rtnetlink_rcv_msg+0x7b8/0xe90 net/core/rtnetlink.c:6091
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 __sys_sendto+0x46d/0x5f0 net/socket.c:2117
 __do_sys_sendto net/socket.c:2129 [inline]
 __se_sys_sendto net/socket.c:2125 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2125
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa59103d58c
Code: fa fa ff ff 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 20 fb ff ff 48 8b
RSP: 002b:00007ffe4fe65000 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fa591cd4320 RCX: 00007fa59103d58c
RDX: 0000000000000040 RSI: 00007fa591cd4370 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffe4fe65054 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa591cd4370 R14: 0000000000000003 R15: 0000000000000000
 </TASK>