INFO: task getty:3949 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:getty           state:D stack:22256 pid: 3949 ppid:     1 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
 do_wait_for_common+0x295/0x460 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+0x48/0x60 kernel/sched/completion.c:138
 __flush_work+0x15a/0x210 kernel/workqueue.c:3094
 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3181
 hci_unregister_dev+0x163/0x590 net/bluetooth/hci_core.c:4061
 hci_uart_tty_close+0x268/0x330 drivers/bluetooth/hci_ldisc.c:575
 tty_ldisc_reinit+0xe4/0x460 drivers/tty/tty_ldisc.c:679
 tty_ldisc_hangup+0x360/0x4a0 drivers/tty/tty_ldisc.c:745
 __tty_hangup+0x44e/0x670 drivers/tty/tty_io.c:639
 disassociate_ctty+0x38d/0x860 drivers/tty/tty_jobctrl.c:275
 do_exit+0x5f9/0x2110 kernel/exit.c:888
 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f94397996c5
RSP: 002b:00007ffeb4534dc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f943989afe8 RCX: 00007f94397996c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffeb4534d58 R09: 0000000000000000
R10: 00007ffeb4534bf0 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9439899680 R15: 00007f943989b000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
1 lock held by dhcpcd/3850:
 #0: 
ffffffff8e24d5c8 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x256/0x1ba0 net/ipv4/devinet.c:1076
2 locks held by getty/3949:
 #0: ffff88802d4ce1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: __tty_hangup+0xc0/0x670 drivers/tty/tty_io.c:599
 #1: ffff88802d4ce098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:300 [inline]
 #1: ffff88802d4ce098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x68/0xb0 drivers/tty/tty_ldisc.c:324
3 locks held by sshd-session/4171:
3 locks held by kworker/u5:3/4195:
 #0: ffff8880233a5938 ((wq_completion)hci5){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: 
ffffc90002f4fd00
 (
(work_completion)(&hdev->power_on)
){+.+.}-{0:0}
, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: 
ffff88804a29d3f0
 (
&hdev->req_lock
){+.+.}-{3:3}
, at: hci_dev_do_open+0xa4/0x12a0 net/bluetooth/hci_core.c:1464
5 locks held by kworker/u4:7/5164:
 #0: 
ffff8880179cd938
 (
(wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: 
ffffc90002fcfd00
 (
net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8e241690 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:589
 #3: ffffffff8e24d5c8 (rtnl_mutex){+.+.}-{3:3}, at: xfrmi_exit_batch_net+0xb7/0x280 net/xfrm/xfrm_interface_core.c:799
 #4: ffff8880b8f3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
3 locks held by kworker/1:17/6407:
 #0: ffff88802bf49538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc90003ed7d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8e24d5c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1530 net/ipv6/addrconf.c:4128
1 lock held by syz-executor/13848:
 #0: ffffffff8e24d5c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8e24d5c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x79f/0xf10 net/core/rtnetlink.c:5695
1 lock held by syz.5.1944/13867:
 #0: ffffffff8d123a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #0: ffffffff8d123a28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 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+0xe1b/0xe60 kernel/hung_task.c:369
 kthread+0x42e/0x520 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: 12871 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:dsp_cmx_send+0x52/0x1b20 drivers/isdn/mISDN/dsp_cmx.c:-1
Code: b6 2d 92 c2 26 10 e8 5d c3 fc ff 89 c3 49 be 00 00 00 00 00 fc ff df 40 84 ed 74 10 e8 f7 e1 56 fa 89 d8 66 2b 05 8e c2 26 10 <eb> 2b e8 e7 e1 56 fa 48 c7 c0 20 fc 48 97 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc90000007ac0 EFLAGS: 00000006
RAX: 0000000000010081 RBX: 0000000000013eb1 RCX: ffff888079b65940
RDX: 0000000000000100 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 0000000000000001 R08: ffffffff8dff01c3 R09: 1ffffffff1bfe038
R10: dffffc0000000000 R11: fffffbfff1bfe039 R12: ffffffff97490460
R13: ffffffff87224120 R14: dffffc0000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556c6454b978 CR3: 000000002bcc1000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:console_trylock_spinning+0x301/0x370 kernel/printk/printk.c:1909
Code: 85 db 74 89 e8 30 f2 18 00 fb 31 c0 eb 48 e8 26 f2 18 00 e8 91 e5 61 08 48 85 db 74 d1 e8 17 f2 18 00 fb 48 c7 c7 e0 3a 11 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 68 4a 31 60
RSP: 0018:ffffc90002ebf500 EFLAGS: 00000293
RAX: ffffffff81603149 RBX: 0000000000000200 RCX: ffff888079b65940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8d113ae0
RBP: ffffc90002ebf5d0 R08: ffffffff910150cf R09: 1ffffffff2202a19
R10: dffffc0000000000 R11: fffffbfff2202a1a R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff920005d7ea0
 vprintk_emit+0xa7/0x150 kernel/printk/printk.c:2273
 _printk+0xda/0x130 kernel/printk/printk.c:2299
 __dynamic_pr_debug+0x196/0x240 lib/dynamic_debug.c:619
 __kernfs_remove+0xc96/0xcb0 fs/kernfs/dir.c:1345
 kernfs_remove_by_name_ns+0x91/0x100 fs/kernfs/dir.c:1566
 kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
 sysfs_unmerge_group+0xcf/0x130 fs/sysfs/group.c:369
 rpm_sysfs_remove drivers/base/power/sysfs.c:826 [inline]
 dpm_sysfs_remove+0x72/0xc0 drivers/base/power/sysfs.c:835
 device_del+0x2ab/0xa80 drivers/base/core.c:3592
 device_unregister+0x1c/0xc0 drivers/base/core.c:3660
 bdi_unregister+0x447/0x530 mm/backing-dev.c:962
 generic_shutdown_super+0x2ab/0x300 fs/super.c:490
 kill_anon_super+0x36/0x70 fs/super.c:1100
 fuse_kill_sb_anon+0x21e/0x290 fs/fuse/inode.c:1853
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x635/0x2110 kernel/exit.c:890
 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
 __do_sys_exit_group kernel/exit.c:1015 [inline]
 __se_sys_exit_group kernel/exit.c:1013 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ff7224831d9
Code: Unable to access opcode bytes at RIP 0x7ff7224831af.
RSP: 002b:00007ffea5751e88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff7224831d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007ff72251b58c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020
R13: 00000000000927c0 R14: 0000000000082cd5 R15: 00007ffea5752040
 </TASK>
wireguard: wg1: Handshake for peer 27 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 2)
virtqueue callback for ffff88801f18ef00 (ffffffff84450960)
virtqueue interrupt with no work for ffff88801f18ee00
virtqueue interrupt with no work for ffff88801f18ed00