INFO: task udevd:2839 blocked for more than 143 seconds.
Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:24536 pid:2839 tgid:2839 ppid:1 task_flags:0x400140 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
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:1178
d_revalidate fs/namei.c:929 [inline]
d_revalidate fs/namei.c:925 [inline]
lookup_fast+0x263/0x610 fs/namei.c:1768
walk_component+0x5b/0x5b0 fs/namei.c:2124
link_path_walk.part.0.constprop.0+0x682/0xd60 fs/namei.c:2493
link_path_walk fs/namei.c:2423 [inline]
path_lookupat+0x91/0x780 fs/namei.c:2649
filename_lookup+0x224/0x5f0 fs/namei.c:2679
do_readlinkat+0xce/0x3a0 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/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffbb9536d47
RSP: 002b:00007fff5fead068 EFLAGS: 00000246
ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 00007fff5fead078 RCX: 00007ffbb9536d47
RDX: 0000000000000400 RSI: 00007fff5fead078 RDI: 00007fff5fead558
RBP: 0000000000000400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff5fead558
R13: 00007fff5fead4c8 R14: 00005560f89d42c0 R15: 0000000000000000
INFO: task udevd:5383 blocked for more than 171 seconds.
Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D
stack:24728 pid:5383 tgid:5383 ppid:2839 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
device_lock include/linux/device.h:922 [inline]
uevent_show+0x187/0x3b0 drivers/base/core.c:2730
dev_attr_show+0x53/0xe0 drivers/base/core.c:2424
sysfs_kf_seq_show+0x213/0x3e0 fs/sysfs/file.c:65
seq_read_iter+0x506/0x12b0 fs/seq_file.c:230
kernfs_fop_read_iter+0x422/0x5a0 fs/kernfs/file.c:279
new_sync_read fs/read_write.c:489 [inline]
vfs_read+0x8c8/0xc70 fs/read_write.c:570
ksys_read+0x12a/0x240 fs/read_write.c:713
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffbb9535b6a
RSP: 002b:00007fff5fea6088 EFLAGS: 00000246
ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005560f89f2c90 RCX: 00007ffbb9535b6a
RDX: 0000000000001000 RSI: 00005560f8ab9ba0 RDI: 0000000000000008
RBP: 00005560f89f2c90 R08: 0000000000000008 R09: 0000000000000000
R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000003fff R14: 00007fff5fea6568 R15: 000000000000000a
INFO: task udevd:5383 is blocked on a mutex likely owned by task kworker/0:0:9.
task:kworker/0:0 state:D
stack:21288 pid:9 tgid:9 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
device_add+0x10dd/0x1a70 drivers/base/core.c:3647
rc_register_device+0xe1a/0x1bd0 drivers/media/rc/rc-main.c:1934
rc_core_dvb_usb_remote_init drivers/media/usb/dvb-usb/dvb-usb-remote.c:289 [inline]
dvb_usb_remote_init+0xe47/0x15e0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:337
dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:190 [inline]
dvb_usb_device_init+0x1786/0x2070 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
usb_probe_interface+0x300/0x9c0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_set_configuration+0x1187/0x1e20 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:250
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:830
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:958
bus_for_each_drv+0x156/0x1e0 drivers/base/bus.c:462
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:537
device_add+0x1148/0x1a70 drivers/base/core.c:3666
usb_new_device+0xd07/0x1a20 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5535 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5917
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
6 locks held by kworker/0:0/9:
#0:
ffff8881066b3d48
(
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc9000009fd18
(
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffff88810b78b198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3:
ffff888118a0d198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1005
#4:
ffff88811266a160
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1005
#5:
ffffffff8a6720a8
(
uevent_sock_mutex
){+.+.}-{4:4}
, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
, at: kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
, at: kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
6 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
#0:
ffffffff890c1a00
(
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:6764
4 locks held by udevd/2839:
#0:
ffff8881153b83f8
(
sb_writers
#8
){.+.+}-{0:0}
, at: ksys_write+0x12a/0x240 fs/read_write.c:736
#1:
ffff888113296c88
(
&of->mutex
){+.+.}-{4:4}
, at: kernfs_fop_write_iter+0x287/0x510 fs/kernfs/file.c:325
#2:
ffff88810f2b42d8
(
kn->active
#5
){++++}-{0:0}
, at: kernfs_fop_write_iter+0x2aa/0x510 fs/kernfs/file.c:326
#3:
ffffffff8a6720a8
(
uevent_sock_mutex
){+.+.}-{4:4}
, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
, at: kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
, at: kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
2 locks held by getty/2897:
#0:
ffff8881152d00a0
(
&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/2940:
#0:
ffffffff890ccf38
(
rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x280/0x3c0 kernel/rcu/tree_exp.h:304
1 lock held by syz-executor/2945:
5 locks held by kworker/1:3/5225:
4 locks held by udevd/5229:
8 locks held by kworker/1:5/5310:
5 locks held by kworker/0:5/5317:
#0:
ffff8881066b3d48
(
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc90002307d18
(
(work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffff88810afac198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3:
ffff88810afaf508
(
&port_dev->status_lock
){+.+.}-{4:4}
, at: usb_lock_port drivers/usb/core/hub.c:3220 [inline]
, at: hub_port_connect drivers/usb/core/hub.c:5432 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
, at: port_event drivers/usb/core/hub.c:5835 [inline]
, at: hub_event+0x29da/0x5030 drivers/usb/core/hub.c:5917
#4:
ffff88810feb6e68
(
hcd->address0_mutex
){+.+.}-{4:4}
, at: hub_port_connect drivers/usb/core/hub.c:5433 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
, at: port_event drivers/usb/core/hub.c:5835 [inline]
, at: hub_event+0x2a00/0x5030 drivers/usb/core/hub.c:5917
4 locks held by udevd/5383:
#0:
ffff888101f809e0
(
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12b0 fs/seq_file.c:182
#1:
ffff88810b3de488
(
&of->mutex
#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff88811d501008
(
kn->active
#5
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff888118a0d198
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: uevent_show+0x187/0x3b0 drivers/base/core.c:2730
1 lock held by syz.4.727/7494:
#0:
ffffffff8a6720a8
(
uevent_sock_mutex
){+.+.}-{4:4}
, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
, at: kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
, at: kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
2 locks held by syz.3.728/7485:
#0:
ffff88810b320d78
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
, at: device_release_driver_internal+0xa4/0x620 drivers/base/dd.c:1293
#1:
ffffffff8a6720a8
(
uevent_sock_mutex
){+.+.}-{4:4}
, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
, at: kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
, at: kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
2 locks held by syz.0.729/7489:
#0:
ffff888107b6cd78
(
&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
, at: __driver_attach+0x278/0x580 drivers/base/dd.c:1215
#1:
ffffffff8a6720a8
(
uevent_sock_mutex
){+.+.}-{4:4}
, at: uevent_net_broadcast_untagged lib/kobject_uevent.c:317 [inline]
, at: kobject_uevent_net_broadcast lib/kobject_uevent.c:410 [inline]
, at: kobject_uevent_env+0xb36/0x1870 lib/kobject_uevent.c:608
1 lock held by syz.1.730/7491:
#0:
ffffffff890ccf38
(
rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
2 locks held by syz.2.731/7493:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__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:274 [inline]
watchdog+0x11c4/0x15d0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
yealink 3-1:36.0: unexpected response 0
yealink 3-1:36.0: urb_ctl_callback - urb status -71
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5310 Comm: kworker/1:5 Not tainted 6.15.0-rc1-syzkaller-00068-g169263214645 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_power_efficient gc_worker
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 81 9e 09 ff eb a0 e8 0a 9f 09
RSP: 0000:ffffc900001a8500 EFLAGS: 00000002
RAX: 0000000000000035 RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff82ce5ab5 RDI: ffffffff938b6820
RBP: ffffffff938b67e0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000035 R14: ffffffff938b67e0 R15: ffffffff82ce5a50
FS: 0000000000000000(0000) GS:ffff8882692d3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbb924e3a6 CR3: 0000000008ea4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_port_out include/linux/serial_core.h:796 [inline]
serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3306 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3378 [inline]
serial8250_console_write+0xfbc/0x1890 drivers/tty/serial/8250/8250_port.c:3456
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x7fe/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:4891 [inline]
dev_printk_emit+0xfa/0x140 drivers/base/core.c:4902
__dev_printk+0xf5/0x270 drivers/base/core.c:4914
_dev_err+0xe4/0x120 drivers/base/core.c:4957
urb_ctl_callback+0x1eb/0x2f0 drivers/input/misc/yealink.c:456
__usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1734
dummy_timer+0x180e/0x3a20 drivers/usb/gadget/udc/dummy_hcd.c:1994
__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+0x205/0x8d0 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:1049 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: e9 3d fe 53 00 be 03 00 00 00 5b e9 12 ac 03 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 a8 86 e8 0a 65 8b 05 b9 86 e8 0a a9 00 01 ff 00 74 1d
RSP: 0000:ffffc90001ebfb58 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8638831e
RDX: ffff888115cc57c0 RSI: ffffffff863889c8 RDI: 0000000000000005
RBP: ffffffff93a1de6c R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888112200000
R13: 0000000000008793 R14: dffffc0000000000 R15: 0000000000001770
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
gc_worker+0x1028/0x16d0 net/netfilter/nf_conntrack_core.c:1603
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245