INFO: task syz-executor:2948 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:24712 pid:2948  tgid:2948  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x132a/0x3b10 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6878
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
 rwsem_down_read_slowpath+0x62f/0xb60 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0xef/0x480 kernel/locking/rwsem.c:1526
 kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180
 d_revalidate fs/namei.c:929 [inline]
 d_revalidate fs/namei.c:925 [inline]
 lookup_fast+0x266/0x610 fs/namei.c:1778
 walk_component+0x5b/0x5b0 fs/namei.c:2134
 link_path_walk+0x627/0xe20 fs/namei.c:2506
 path_openat+0x1b0/0x2cb0 fs/namei.c:4051
 do_filp_open+0x20b/0x470 fs/namei.c:4082
 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x174/0x210 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6912c7e221
RSP: 002b:00007ffd7f084390 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000249 RCX: 00007f6912c7e221
RDX: 0000000000090800 RSI: 00007f6912d00e59 RDI: 00000000ffffff9c
RBP: 00007ffd7f08443c R08: 0000000000017712 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00000000000000c4
R13: 0000000000000000 R14: 000000000007a641 R15: 00007ffd7f084490
 </TASK>
INFO: task syz-executor:2949 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:24520 pid:2949  tgid:2949  ppid:1      task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x132a/0x3b10 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6878
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
 rwsem_down_read_slowpath+0x62f/0xb60 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0xef/0x480 kernel/locking/rwsem.c:1526
 kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180
 d_revalidate fs/namei.c:929 [inline]
 d_revalidate fs/namei.c:925 [inline]
 lookup_fast+0x266/0x610 fs/namei.c:1778
 walk_component+0x5b/0x5b0 fs/namei.c:2134
 link_path_walk+0x627/0xe20 fs/namei.c:2506
 path_openat+0x1b0/0x2cb0 fs/namei.c:4051
 do_filp_open+0x20b/0x470 fs/namei.c:4082
 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x174/0x210 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f267513e221
RSP: 002b:00007fff9fdeab10 EFLAGS: 00000287
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000278 RCX: 00007f267513e221
RDX: 0000000000090800 RSI: 00007f26751c0e59 RDI: 00000000ffffff9c
RBP: 00007fff9fdeabbc R08: 0000000000017758 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00000000000000d5
R13: 0000000000000000 R14: 000000000007a7ae R15: 00007fff9fdeac10
 </TASK>
INFO: task syz.1.990:8822 blocked for more than 144 seconds.
      Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.990       state:R  running task    
 stack:27736 pid:8822  tgid:8821  ppid:2948   task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x132a/0x3b10 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6878
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
 rwsem_down_write_slowpath+0x524/0x1310 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d6/0x200 kernel/locking/rwsem.c:1578
 kernfs_remove_by_name_ns+0x3d/0x110 fs/kernfs/dir.c:1712
 sysfs_remove_file include/linux/sysfs.h:777 [inline]
 driver_remove_file drivers/base/driver.c:201 [inline]
 driver_remove_file+0x4a/0x60 drivers/base/driver.c:197
 remove_bind_files drivers/base/bus.c:605 [inline]
 bus_remove_driver+0x224/0x2c0 drivers/base/bus.c:743
 driver_unregister+0x76/0xb0 drivers/base/driver.c:277
 usb_gadget_unregister_driver+0x49/0x70 drivers/usb/gadget/udc/core.c:1732
 raw_release+0x1ae/0x2b0 drivers/usb/gadget/legacy/raw_gadget.c:462
 __fput+0x402/0xb70 fs/file_table.c:465
 task_work_run+0x150/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x86c/0x2bd0 kernel/exit.c:964
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1105
 get_signal+0x2673/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x7c/0xe0 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x3e9/0x4b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6912c7e52b
RSP: 002b:00007f69112e4f10 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffc RBX: 0000000000000004 RCX: 00007f6912c7e52b
RDX: 00007f69112e5fe0 RSI: 0000000080085502 RDI: 0000000000000004
RBP: 00007f69112e5fe0 R08: 0000000000000080 R09: 00007f69112e4fd8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000080085502
R13: 0000000800000000 R14: 0000000000000008 R15: 00007f6912d0bdf0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: 
ffffffff890c7ec0 (
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
2 locks held by getty/2905:
 #0: ffff888100ecb0a0 (
&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+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/2948:
 #0: ffff888100ac4988 (&root->kernfs_rwsem
){++++}-{4:4}, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162
1 lock held by syz-executor/2949:
 #0: ffff888100ac4988 (
&root->kernfs_rwsem
){++++}-{4:4}, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162
1 lock held by syz-executor/2952:
 #0: 
ffff888100ac4988 (
&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162
1 lock held by syz-executor/2954:
 #0: 
ffff888100ac4988
 (&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162
1 lock held by syz-executor/2960:
 #0: ffff888100ac4988
 (
&root->kernfs_rwsem
){++++}-{4:4}, at: kernfs_dop_revalidate+0x397/0x740 fs/kernfs/dir.c:1162
1 lock held by udevd/5197:
 #0: 
ffff888100ac4988
 (&root->kernfs_rwsem
){++++}-{4:4}
, at: kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180
6 locks held by kworker/0:2/5225:
4 locks held by udevd/5241:
 #0: 
ffff88811c439790
 (&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
 #1: ffff888119834c88
 (&of->mutex
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff8881342983c8
 (
kn->active
#18
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff888139431198 (
&dev->mutex){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:889 [inline]
, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
3 locks held by kworker/0:5/5254:
6 locks held by kworker/0:6/5917:
6 locks held by kworker/0:4/8565:
1 lock held by syz.0.993/8828:
1 lock held by syz-executor/8829:
1 lock held by syz-executor/8830:
1 lock held by syz-executor/8831:
1 lock held by syz-executor/8832:
1 lock held by syz-executor/8833:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0xf70/0x12c0 kernel/hung_task.c:470
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
yealink 1-1:36.0: unexpected response 0
yealink 1-1:36.0: urb_ctl_callback - urb status -71
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2952 Comm: syz-executor Not tainted 6.16.0-rc4-syzkaller-00314-gb4b4dbfa96de #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:416
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 61 40 05 ff eb a0 e8 ea 40 05
RSP: 0018:ffffc900000074e0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 00000000000003f9 RCX: 0000000000000000
RDX: 00000000000003f9 RSI: ffffffff82d59275 RDI: ffffffff93928fc0
RBP: ffffffff93928f80 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff93928f80 R15: ffffffff93929240
FS:  000055556d1d9500(0000) GS:ffff888269162000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2675121d60 CR3: 00000001256dc000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 serial_out drivers/tty/serial/8250/8250.h:142 [inline]
 serial8250_clear_IER+0x9e/0xc0 drivers/tty/serial/8250/8250_port.c:713
 serial8250_console_write+0x255/0x1890 drivers/tty/serial/8250/8250_port.c:3421
 console_emit_next_record kernel/printk/printk.c:3138 [inline]
 console_flush_all+0x801/0xc60 kernel/printk/printk.c:3226
 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
 console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
 vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
 dev_vprintk_emit drivers/base/core.c:4917 [inline]
 dev_printk_emit+0xfa/0x140 drivers/base/core.c:4928
 __dev_printk+0xf5/0x270 drivers/base/core.c:4940
 _dev_err+0xe4/0x120 drivers/base/core.c:4983
 urb_ctl_callback+0x1eb/0x2f0 drivers/input/misc/yealink.c:456
 __usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1663
 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1747
 dummy_timer+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
 handle_softirqs+0x208/0x8d0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:step_into+0x0/0x2270 fs/namei.c:1973
Code: e7 e8 54 7f f2 ff e9 50 fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 41 57 41 56 48 8d 85 50 ff ff ff 41 55 48 c1 e8 03 41
RSP: 0018:ffffc9000182fa08 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff888111567490 RCX: ffffffff81e88dce
RDX: ffff888111567490 RSI: 0000000000000002 RDI: ffffc9000182fc30
RBP: ffffc9000182fc30 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000002 R14: ffffc9000182fc30 R15: ffff888139b9662d
 walk_component+0xfc/0x5b0 fs/namei.c:2144
 link_path_walk+0x627/0xe20 fs/namei.c:2506
 path_openat+0x1b0/0x2cb0 fs/namei.c:4051
 do_filp_open+0x20b/0x470 fs/namei.c:4082
 do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x174/0x210 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f425e85e221
Code: 44 24 18 31 c0 41 83 e2 40 75 3e 89 f0 25 00 00 41 00 3d 00 00 41 00 74 30 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 3f 48 8b 54 24 18 64 48 2b 14 25 28 00 00 00
RSP: 002b:00007ffc4ca0d000 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000243 RCX: 00007f425e85e221
RDX: 0000000000090800 RSI: 00007f425e8e0e59 RDI: 00000000ffffff9c
RBP: 00007ffc4ca0d0ac R08: 0000000000017738 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 00000000000000c8
R13: 0000000000000000 R14: 000000000007a717 R15: 00007ffc4ca0d100
 </TASK>