INFO: task udevd:2844 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc3-syzkaller-00037-gc749f058b437 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D
 stack:24096 pid:2844  tgid:2844  ppid:1      task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x113d/0x35d0 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x124/0x330 kernel/locking/rwsem.c:1526
 kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1160
 d_revalidate fs/namei.c:928 [inline]
 d_revalidate fs/namei.c:924 [inline]
 lookup_fast+0x260/0x5f0 fs/namei.c:1754
 walk_component+0x5b/0x5b0 fs/namei.c:2110
 link_path_walk.part.0.constprop.0+0x669/0xd40 fs/namei.c:2479
 link_path_walk fs/namei.c:2410 [inline]
 path_lookupat+0x93/0x770 fs/namei.c:2635
 filename_lookup+0x221/0x5f0 fs/namei.c:2665
 do_readlinkat+0xcf/0x390 fs/stat.c:564
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x78/0xc0 fs/stat.c:598
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24d40ced47
RSP: 002b:00007ffce2ac56a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffce2ac56b8 RCX: 00007f24d40ced47
RDX: 0000000000000400 RSI: 00007ffce2ac56b8 RDI: 00007ffce2ac5b98
RBP: 0000000000000400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffce2ac5b98
R13: 00007ffce2ac5b08 R14: 0000555cbfa312c0 R15: 0000000000000000
 </TASK>
INFO: task udevd:5202 blocked for more than 171 seconds.
      Not tainted 6.14.0-rc3-syzkaller-00037-gc749f058b437 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D
 stack:24096 pid:5202  tgid:5202  ppid:2844   task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x113d/0x35d0 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730
 device_lock include/linux/device.h:1030 [inline]
 uevent_show+0x188/0x3b0 drivers/base/core.c:2729
 dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
 sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
 seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x886/0xbf0 fs/read_write.c:565
 ksys_read+0x12b/0x250 fs/read_write.c:708
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24d40cdb6a
RSP: 002b:00007ffce2abe6c8 EFLAGS: 00000246
 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000555cbfa642e0 RCX: 00007f24d40cdb6a
RDX: 0000000000001000 RSI: 0000555cbfaab8d0 RDI: 0000000000000008
RBP: 0000555cbfa642e0 R08: 0000000000000008 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffce2abeba8 R15: 000000000000000a
 </TASK>
INFO: task udevd:5282 blocked for more than 172 seconds.
      Not tainted 6.14.0-rc3-syzkaller-00037-gc749f058b437 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:25584 pid:5282  tgid:5282  ppid:2844   task_flags:0x400140 flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x113d/0x35d0 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
 __mutex_lock_common kernel/locking/mutex.c:662 [inline]
 __mutex_lock+0x6bd/0xb10 kernel/locking/mutex.c:730
 device_lock include/linux/device.h:1030 [inline]
 uevent_show+0x188/0x3b0 drivers/base/core.c:2729
 dev_attr_show+0x53/0xe0 drivers/base/core.c:2423
 sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
 seq_read_iter+0x4f4/0x12b0 fs/seq_file.c:230
 kernfs_fop_read_iter+0x414/0x580 fs/kernfs/file.c:279
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x886/0xbf0 fs/read_write.c:565
 ksys_read+0x12b/0x250 fs/read_write.c:708
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f24d40cdb6a
RSP: 002b:00007ffce2abe6c8 EFLAGS: 00000246
 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000555cbfa642e0 RCX: 00007f24d40cdb6a
RDX: 0000000000001000 RSI: 0000555cbfa83b00 RDI: 0000000000000008
RBP: 0000555cbfa642e0 R08: 0000000000000008 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffce2abeba8 R15: 000000000000000a
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/1:0/24:
 #0: 
ffff8881066c9148 (
(wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211
 #1: 
ffffc9000019fd18
 (
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212
 #2: 
ffff88810b368198 (
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5861
 #3: 
ffff888114891198
 (&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
 #4: ffff888100abc148
 (&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_activate fs/kernfs/dir.c:1404 [inline]
, at: kernfs_add_one+0x39d/0x520 fs/kernfs/dir.c:819
1 lock held by khungtaskd/30:
 #0: 
ffffffff88ebe480
 (
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
2 locks held by kworker/u8:2/36:
5 locks held by kworker/1:2/2805:
2 locks held by getty/2902:
 #0: 
ffff8881121ca0a0
 (&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900000432f0
 (&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/2947:
 #0: ffffffff88ec98f8
 (rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:334
1 lock held by syz-executor/2949:
1 lock held by syz-executor/2952:
 #0: ffffffff88ec98f8
 (rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:302
4 locks held by udevd/5202:
 #0: ffff88811397f540
 (&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
 #1: 
ffff88811ac18488
 (
&of->mutex){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff88811d503f08
 (kn->active
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff88811424f198
 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2729
3 locks held by kworker/0:4/5261:
8 locks held by kworker/1:5/5276:
4 locks held by udevd/5282:
 #0: 
ffff888112b4dc30
 (
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
 #1: ffff88811ac19088
 (
&of->mutex
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff888114f2b0f8
 (kn->active
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff888114891198
 (
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2729
5 locks held by kworker/0:5/5337:
1 lock held by syz-executor/7657:
 #0: ffff888100abc148
 (
&root->kernfs_rwsem){++++}-{4:4}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1160
1 lock held by syz-executor/7658:
 #0: ffff888100abc148
 (&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1160
1 lock held by syz-executor/7659:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc3-syzkaller-00037-gc749f058b437 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0xf62/0x12b0 kernel/hung_task.c:399
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
yealink 5-1:36.0: unexpected response 0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5276 Comm: kworker/1:5 Not tainted 6.14.0-rc3-syzkaller-00037-gc749f058b437 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_power_efficient gc_worker
RIP: 0010:serial_port_out include/linux/serial_core.h:796 [inline]
RIP: 0010:serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3315 [inline]
RIP: 0010:serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3387 [inline]
RIP: 0010:serial8250_console_write+0xfb1/0x1870 drivers/tty/serial/8250/8250_port.c:3465
Code: 39 c3 0f 84 58 07 00 00 45 31 e4 44 89 6c 24 08 eb 4a e8 a2 cf b0 fe 48 83 c3 01 40 0f b6 d5 31 f6 4c 89 f7 45 31 ff 41 ff d5 <0f> 1f 00 e8 87 cf b0 fe 8b 6c 24 08 41 83 c4 01 44 89 e6 89 ef e8
RSP: 0018:ffffc900001b8508 EFLAGS: 00000002
RAX: 0000000000000035 RBX: ffffffff934a0604 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82c8e085 RDI: ffffffff9366d2a0
RBP: 0000000000000035 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000007 R12: 0000000000000003
R13: ffffffff82c8e020 R14: ffffffff9366d260 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33e1fffc CR3: 000000011efec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 console_emit_next_record kernel/printk/printk.c:3122 [inline]
 console_flush_all+0x800/0xc60 kernel/printk/printk.c:3210
 __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3309
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
 dev_vprintk_emit drivers/base/core.c:4890 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4901
 __dev_printk+0xf5/0x270 drivers/base/core.c:4913
 _dev_err+0xe5/0x120 drivers/base/core.c:4956
 urb_irq_callback+0x12c/0x700 drivers/input/misc/yealink.c:435
 __usb_hcd_giveback_urb+0x389/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x17f7/0x3960 drivers/usb/gadget/udc/dummy_hcd.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1882
 handle_softirqs+0x206/0x8d0 kernel/softirq.c:561
 __do_softirq kernel/softirq.c:595 [inline]
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:662
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__seqprop_spinlock_sequence include/linux/seqlock.h:227 [inline]
RIP: 0010:nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:333 [inline]
RIP: 0010:gc_worker+0x2d6/0x16a0 net/netfilter/nf_conntrack_core.c:1534
Code: 00 00 48 c7 c7 08 1c 57 8a e8 e6 6d 2a fb 9c 5b 81 e3 00 02 00 00 31 ff 48 89 de e8 14 56 4d fb 48 85 db 58 0f 85 a7 0f 00 00 <e8> d5 5a 4d fb 8b 1d 3f 40 29 04 89 dd 31 ff 83 e5 01 89 ee e8 61
RSP: 0018:ffffc90001f2fb58 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff862de6d2
RDX: ffff888113da3a80 RSI: ffffffff862de6e1 RDI: 0000000000000007
RBP: 0000000000040000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000003 R12: ffffffff936d4eec
R13: 00000000000032f7 R14: dffffc0000000000 R15: 0000000000001770
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>