INFO: task syz.1.1351:8207 blocked for more than 143 seconds.
      Not tainted 5.15.180-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1351      state:D stack:24672 pid: 8207 ppid:  4175 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 perf_pending_task_sync+0x13c/0x1c0 kernel/events/core.c:5127
 _free_event+0x34/0xe60 kernel/events/core.c:5133
 put_event kernel/events/core.c:5258 [inline]
 perf_event_release_kernel+0x873/0x900 kernel/events/core.c:5383
 perf_release+0x37/0x40 kernel/events/core.c:5393
 __fput+0x3fe/0x8e0 fs/file_table.c:311
 task_work_run+0x129/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x6a3/0x2480 kernel/exit.c:874
 do_group_exit+0x144/0x310 kernel/exit.c:996
 get_signal+0xc66/0x14e0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f653f65a169
RSP: 002b:00007f653d4a1fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: 0000000000000313 RBX: 00007f653f873080 RCX: 00007f653f65a169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000024084200
RBP: 00007f653f6db990 R08: 0000200000001a40 R09: 0000200000001a40
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f653f873080 R15: 00007fff8b4361b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8cb1f560 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:3/155:
2 locks held by getty/3924:
 #0: ffff88814c502098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002cd62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by kworker/1:5/4218:
 #0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
 #1: ffffc90002eefd20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
3 locks held by kworker/u4:6/4655:
 #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
 #1: ffffc9000309fd20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
 #2: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
5 locks held by kworker/u4:7/5805:
 #0: ffff8880175cd938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
 #1: ffffc9000317fd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
 #2: ffffffff8dc38490 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x166/0xc90 net/core/net_namespace.c:572
 #3: ffff88805ce113e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_destruct+0x10c/0x2f0 drivers/net/wireguard/device.c:233
 #4: ffffffff8cb23b28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #4: ffffffff8cb23b28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x350/0x740 kernel/rcu/tree_exp.h:845
3 locks held by kworker/0:19/11361:
 #0: ffff88802ba4c138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
 #1: ffffc900033efd20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
 #2: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd8/0x16f0 net/ipv6/addrconf.c:4113
1 lock held by syz-executor/11583:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x956/0xef0 net/core/rtnetlink.c:5647
5 locks held by syz.3.2478/11659:
2 locks held by syz.5.2506/11741:
 #0: ffffffff8dc38490 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x378/0x5d0 net/core/net_namespace.c:482
 #1: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x9b8/0xbb0 net/core/dev.c:10695
1 lock held by syz.4.2510/11749:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:699 [inline]
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x1b0 drivers/net/tun.c:3440
1 lock held by syz.4.2510/11750:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x46e/0x21f0 drivers/net/tun.c:3052
1 lock held by syz.6.2511/11751:
 #0: ffffffff8cb6d288 (event_mutex){+.+.}-{3:3}, at: perf_trace_destroy+0x2a/0x140 kernel/trace/trace_event_perf.c:239
2 locks held by syz.6.2511/11752:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:699 [inline]
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3a/0x1b0 drivers/net/tun.c:3440
 #1: ffffffff8cb23b28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #1: ffffffff8cb23b28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x350/0x740 kernel/rcu/tree_exp.h:845
1 lock held by syz.6.2511/11756:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x4f1/0xf60 net/core/dev_ioctl.c:586
1 lock held by syz.3.2512/11754:
 #0: ffffffff8dc44148 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x46e/0x21f0 drivers/net/tun.c:3052

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:369
 kthread+0x3f6/0x4f0 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3528 Comm: syslogd Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:preempt_count kernel/rcu/tree.c:1163 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x2/0x130 kernel/rcu/tree.c:1168
Code: db 48 89 df e8 ef 41 5f 00 eb d1 44 89 f6 48 c7 c7 40 3d b2 8c e8 4e 9f ca 02 eb 88 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 57 <41> 56 41 54 53 65 8b 0d fa 1f 97 7e b0 01 f7 c1 00 00 f0 00 0f 85
RSP: 0018:ffffc90002167bd0 EFLAGS: 00000202
RAX: 000000000000ca01 RBX: 1ffff9200042cf7c RCX: ffff88807e5e1dc0
RDX: ffff88807e5e1dc0 RSI: ffffffff8af9fc60 RDI: ffffffff8af9fc20
RBP: ffffc90002167c68 R08: ffffffff81d578c5 R09: fffffbfff1c154de
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88807cc04590 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fb52935b380(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0fa11fc0 CR3: 000000002ab2d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_any_held+0x74/0x160 kernel/rcu/update.c:344
 rcu_sync_is_idle include/linux/rcu_sync.h:34 [inline]
 percpu_up_read include/linux/percpu-rwsem.h:105 [inline]
 __sb_end_write include/linux/fs.h:1806 [inline]
 file_end_write+0xbe/0x250 include/linux/fs.h:3056
 vfs_write+0x6ec/0xe50 fs/read_write.c:602
 ksys_write+0x1a2/0x2c0 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb5294afbf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc242c3238 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fb5294afbf2
RDX: 000000000000005b RSI: 0000556762dbbc50 RDI: 0000000000000003
RBP: 0000556762dbbc50 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fb52964e3a3 R11: 0000000000000246 R12: 000000000000005b
R13: 00007fb52935b300 R14: 0000000000000004 R15: 0000556762dbba60
 </TASK>