INFO: task udevd:2399 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc4-syzkaller-00053-g819984a0dd36 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D
 stack:25280 pid:2399  tgid:2399  ppid:1      flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xca6/0x3170 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
 __down_read_common kernel/locking/rwsem.c:1250 [inline]
 __down_read kernel/locking/rwsem.c:1263 [inline]
 down_read+0x124/0x330 kernel/locking/rwsem.c:1528
 kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
 d_revalidate fs/namei.c:861 [inline]
 d_revalidate fs/namei.c:858 [inline]
 lookup_fast+0x239/0x540 fs/namei.c:1653
 walk_component+0x5b/0x5b0 fs/namei.c:2000
 link_path_walk.part.0.constprop.0+0x77f/0xcd0 fs/namei.c:2331
 link_path_walk fs/namei.c:2255 [inline]
 path_lookupat+0x93/0x770 fs/namei.c:2492
 filename_lookup+0x1e5/0x5b0 fs/namei.c:2522
 user_path_at_empty+0x42/0x60 fs/namei.c:2929
 do_readlinkat+0xdd/0x310 fs/stat.c:499
 __do_sys_readlink fs/stat.c:532 [inline]
 __se_sys_readlink fs/stat.c:529 [inline]
 __x64_sys_readlink+0x78/0xc0 fs/stat.c:529
 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: 0033:0x7fb913923d47
RSP: 002b:00007ffd61ee9238 EFLAGS: 00000246
 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007ffd61ee9248 RCX: 00007fb913923d47
RDX: 0000000000000400 RSI: 00007ffd61ee9248 RDI: 00007ffd61ee9728
RBP: 0000000000000400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd61ee9728
R13: 00007ffd61ee9698 R14: 0000562b52416910 R15: 0000000000000000
 </TASK>
INFO: task udevd:4784 blocked for more than 144 seconds.
      Not tainted 6.10.0-rc4-syzkaller-00053-g819984a0dd36 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D
 stack:26272 pid:4784  tgid:4784  ppid:2399   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xca6/0x3170 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 device_lock include/linux/device.h:1009 [inline]
 uevent_show+0x188/0x3b0 drivers/base/core.c:2743
 dev_attr_show+0x53/0xe0 drivers/base/core.c:2437
 sysfs_kf_seq_show+0x23e/0x410 fs/sysfs/file.c:59
 seq_read_iter+0x4fa/0x12c0 fs/seq_file.c:230
 kernfs_fop_read_iter+0x41a/0x590 fs/kernfs/file.c:279
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x869/0xbd0 fs/read_write.c:476
 ksys_read+0x12f/0x260 fs/read_write.c:619
 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: 0033:0x7fb913922b6a
RSP: 002b:00007ffd61ee2258 EFLAGS: 00000246
 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000562b52456230 RCX: 00007fb913922b6a
RDX: 0000000000001000 RSI: 0000562b52433930 RDI: 0000000000000008
RBP: 0000562b52456230 R08: 0000000000000008 R09: 0000000000000008
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007ffd61ee2738 R15: 000000000000000a
 </TASK>

Showing all locks held in the system:
1 lock held by kworker/R-rcu_g/4:
3 locks held by kworker/0:1/9:
1 lock held by khungtaskd/30:
 #0: 
ffffffff886b4660
 (
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:2/35:
 #0: 
ffff888100aad948
 (
(wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: 
ffffc90000257d80
 (
net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: 
ffffffff8982db10
 (
pernet_ops_rwsem
){++++}-{3:3}
, at: cleanup_net+0xbb/0xbf0 net/core/net_namespace.c:594
6 locks held by kworker/1:1/37:
2 locks held by getty/2457:
 #0: 
ffff88810e3fc0a0
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: 
ffffc900000432f0
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211
1 lock held by syz-executor.0/2527:
 #0: 
ffffffff886bfdf8
 (
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323
4 locks held by udevd/4784:
 #0: 
ffff88811a20f790
 (
&p->lock
){+.+.}-{3:3}
, at: seq_read_iter+0xde/0x12c0 fs/seq_file.c:182
 #1: 
ffff888113196088
 (
&of->mutex
#2
){+.+.}-{3:3}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: 
ffff888111a3c008
 (
kn->active
#5
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff888111bb1190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2743
2 locks held by kworker/1:3/4796:
 #0: 
ffff888100080948
 (
(wq_completion)events
){+.+.}-{0:0}
, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: 
ffffc9000ad6fd80
 (
free_ipc_work
){+.+.}-{0:0}
, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
5 locks held by kworker/1:4/4802:
 #0: ffff888104ab0d48
 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206
 #1: 
ffffc9000af9fd80
 (
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207
 #2: 
ffff888109b08190
 (
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: hub_event+0x1be/0x4f50 drivers/usb/core/hub.c:5849
 #3: 
ffff888109b2a510
 (
&port_dev->status_lock
){+.+.}-{3:3}
, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline]
, at: hub_port_connect drivers/usb/core/hub.c:5418 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x28b8/0x4f50 drivers/usb/core/hub.c:5903
 #4: 
ffff888106f3ca68
 (
hcd->address0_mutex
){+.+.}-{3:3}
, at: hub_port_connect drivers/usb/core/hub.c:5419 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
, at: port_event drivers/usb/core/hub.c:5821 [inline]
, at: hub_event+0x28de/0x4f50 drivers/usb/core/hub.c:5903
7 locks held by kworker/0:3/4803:
4 locks held by kworker/0:5/4834:
2 locks held by kworker/0:6/5002:
1 lock held by syz-executor.4/5109:

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

NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc4-syzkaller-00053-g819984a0dd36 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 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:223 [inline]
 watchdog+0xf86/0x1240 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
yealink 2-1:36.0: urb_irq_callback - urb status -71
NMI backtrace for cpu 0
CPU: 0 PID: 2527 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller-00053-g819984a0dd36 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:413
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 cc cc cc cc e8 d1 90 0b ff eb a0 e8 5a 91 0b
RSP: 0000:ffffc900000075a0 EFLAGS: 00000002
RAX: 0000000000000037 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff829a0e85 RDI: ffffffff8d719be0
RBP: ffffffff8d719ba0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000006 R12: 0000000000000000
R13: 0000000000000037 R14: ffffffff829a0e20 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f6400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558fe79750 CR3: 0000000116c78000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:122 [inline]
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3322 [inline]
 serial8250_console_write+0xce7/0x1090 drivers/tty/serial/8250/8250_port.c:3393
 console_emit_next_record kernel/printk/printk.c:2928 [inline]
 console_flush_all+0x53c/0xd70 kernel/printk/printk.c:2994
 console_unlock+0xae/0x290 kernel/printk/printk.c:3063
 vprintk_emit kernel/printk/printk.c:2345 [inline]
 vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300
 dev_vprintk_emit drivers/base/core.c:4909 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4920
 __dev_printk+0xf5/0x270 drivers/base/core.c:4932
 _dev_err+0xe5/0x120 drivers/base/core.c:4975
 urb_irq_callback+0x454/0x700 drivers/input/misc/yealink.c:416
 __usb_hcd_giveback_urb+0x466/0x6e0 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
 dummy_timer+0x17f6/0x3900 drivers/usb/gadget/udc/dummy_hcd.c:1987
 __run_hrtimer kernel/time/hrtimer.c:1687 [inline]
 __hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1751
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1813
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x8b/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5722
Code: c1 05 ca 11 d1 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0000:ffffc9000161f910 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920002c3f24 RCX: ffffffff8130811e
RDX: 0000000000000001 RSI: ffffffff86c7d9e0 RDI: ffffffff86e77840
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff1997d9e
R10: ffffffff8ccbecf7 R11: 0000000000000002 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff88414708 R15: 0000000000000000
 do_write_seqcount_begin_nested include/linux/seqlock.h:469 [inline]
 do_write_seqcount_begin include/linux/seqlock.h:495 [inline]
 write_seqlock include/linux/seqlock.h:823 [inline]
 lock_mount_hash fs/namespace.c:108 [inline]
 mntput_no_expire+0x2d2/0xaf0 fs/namespace.c:1308
 mntput fs/namespace.c:1363 [inline]
 namespace_unlock+0x2d4/0x490 fs/namespace.c:1577
 drop_collected_mounts fs/namespace.c:2078 [inline]
 put_mnt_ns fs/namespace.c:5201 [inline]
 put_mnt_ns+0x10a/0x150 fs/namespace.c:5197
 free_nsproxy+0x47/0x4d0 kernel/nsproxy.c:193
 put_nsproxy include/linux/nsproxy.h:107 [inline]
 switch_task_namespaces+0xe0/0x110 kernel/nsproxy.c:251
 do_exit+0xa96/0x2b20 kernel/exit.c:873
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1023
 get_signal+0x2618/0x2710 kernel/signal.c:2909
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x141/0x250 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d0ec8cb01
Code: Unable to access opcode bytes at 0x7f3d0ec8cad7.
RSP: 002b:00007ffd97987480 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: fffffffffffffffe RBX: 0000000000000026 RCX: 00007f3d0ec8cb01
RDX: 0000000000090800 RSI: 00007f3d0ece976a RDI: 00000000ffffff9c
RBP: 00007ffd9798753c R08: 0000000000006288 R09: 00007f3d0ed9a080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 0000000000022747 R14: 0000000000022747 R15: 0000000000000000
 </TASK>