INFO: task kworker/1:6:5255 blocked for more than 143 seconds.
Not tainted 6.14.0-rc6-syzkaller-ged492c95f13a #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:6 state:D stack:23360 pid:5255 tgid:5255 ppid:2 task_flags:0x4288060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
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
rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2119
unregister_netdev+0x15/0x60 net/core/dev.c:11965
usbnet_disconnect+0x109/0x500 drivers/net/usb/usbnet.c:1637
usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x122/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1273 [inline]
device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1296
bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
device_del+0x396/0x9f0 drivers/base/core.c:3855
usb_disable_device+0x368/0x7e0 drivers/usb/core/message.c:1418
usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2316
hub_port_connect drivers/usb/core/hub.c:5371 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
port_event drivers/usb/core/hub.c:5831 [inline]
hub_event+0x1bed/0x4f40 drivers/usb/core/hub.c:5913
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
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
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff88ebe8c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff88ebe8c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff88ebe8c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
3 locks held by kworker/u8:3/46:
#0: ffff8881118df148
((wq_completion)ipv6_addrconf){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc90000517d18
((work_completion)(&(&net->ipv6.addr_chk_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2:
ffffffff8a1aff68
(
rtnl_mutex
){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4730
5 locks held by kworker/1:2/1119:
#0: ffff8881062c7d48 (
(wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc9000190fd18
((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff88810ab96198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5859
#3: ffff88810afa9508 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3220 [inline]
#3: ffff88810afa9508 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5428 [inline]
#3: ffff88810afa9508 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
#3: ffff88810afa9508 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5831 [inline]
#3: ffff88810afa9508 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x28aa/0x4f40 drivers/usb/core/hub.c:5913
#4: ffff8881102ec368 (hcd->address0_mutex){+.+.}-{4:4}
, at: hub_port_connect drivers/usb/core/hub.c:5429 [inline]
, at: hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
, at: port_event drivers/usb/core/hub.c:5831 [inline]
, at: hub_event+0x28d0/0x4f40 drivers/usb/core/hub.c:5913
1 lock held by dhcpcd/2885:
2 locks held by getty/2905:
#0:
ffff8881083470a0 (&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
4 locks held by udevd/5207:
#0: ffff88811e323d58
(&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1:
ffff888113bccc88
(&of->mutex
#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff8881102f6968
(kn->active
#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88810af46198
(&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
(&dev->mutex){....}-{4:4}, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2730
3 locks held by kworker/1:3/5236:
#0: ffff888100080d48
((wq_completion)events
){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc9000255fd18
(
(work_completion)(&fw_work->work)
){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff888108f2e198
(&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
(&dev->mutex){....}-{4:4}, at: ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1161 [inline]
(&dev->mutex){....}-{4:4}, at: ath9k_hif_usb_firmware_cb+0x3b1/0x620 drivers/net/wireless/ath/ath9k/hif_usb.c:1294
4 locks held by udevd/5253:
#0:
ffff88811483cc30
(
&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1: ffff888114827488
(&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888119f3dc38 (
kn->active
#5
){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff88811b515198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
ffff88811b515198 (&dev->mutex){....}-{4:4}, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2730
6 locks held by kworker/1:6/5255:
#0: ffff8881062c7d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc900025e7d18 (
(work_completion)(&hub->events)
){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2:
ffff88810b3a5198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5859
#3: ffff888118655198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#3: ffff888118655198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2307
#4: ffff88810cfd0160
(&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293
#5: ffffffff8a1aff68 (
rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline]
, at: rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2119
4 locks held by udevd/7985:
#0: ffff888114b7e9e0
(&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182
#1: ffff888114757088 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff8881137c7f08
(kn->active#5
){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88811cc54198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2730
6 locks held by kworker/1:7/8869:
#0: ffff8881062c7d48
((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc9001214fd18 ((work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff88810af46198
(&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5859
#3: ffff88811d857198
(
&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
&dev->mutex){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#4: ffff8881162a0160
(
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5: ffffffff8a1aff68
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock_killable include/linux/rtnetlink.h:144 [inline]
, at: register_netdev+0x18/0x50 net/core/dev.c:11053
6 locks held by kworker/1:8/8873:
#0: ffff8881062c7d48
((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc900026d7d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff888108f2e198 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:1030 [inline]
, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5859
#3: ffff88811b515198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#3: ffff88811b515198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#4: ffff88811b511160 (
&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5: ffffffff8a1aff68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:144 [inline]
#5: ffffffff8a1aff68 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11053
6 locks held by kworker/0:0/9071:
#0: ffff8881062c7d48
((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1: ffffc900000afd18
((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffff88810b395198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#2: ffff88810b395198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5859
#3: ffff88811cc54198
(&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
(&dev->mutex){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#4: ffff88811b701160
(&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
#5: ffffffff8a1aff68 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:144 [inline]
#5: ffffffff8a1aff68 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11053
3 locks held by kworker/1:11/10853:
#0: ffff888100081d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
#1:
ffffc90011b6fd18 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
#2: ffffffff8a1aff68 (rtnl_mutex){+.+.}-{4:4}
, at: reg_check_chans_work+0x84/0x1130 net/wireless/reg.c:2481
2 locks held by syz.0.1863/11292:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc6-syzkaller-ged492c95f13a #0
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: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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1119 Comm: kworker/1:2 Not tainted 6.14.0-rc6-syzkaller-ged492c95f13a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events legacy_dvb_usb_read_remote_control
RIP: 0010:sched_clock+0x4/0x60 arch/x86/kernel/tsc.c:284
Code: c7 c7 80 e6 d3 88 e8 fb 91 a4 00 eb dd 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 53 e8 c5 77 4a 00 65 ff 05 d6 e4 d2 7e e8 09 13 e9 05 48 89 c3
RSP: 0018:ffffc900001c8d08 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88810fbf45a0 RCX: 0000000000000001
RDX: 1ffff11021f7e8a4 RSI: ffff8881f593d2d8 RDI: ffff88810fbf45a0
RBP: ffff8881f593d2d8 R08: 0000000000000001 R09: ffff8881f593d2d8
R10: 0000000000000003 R11: 0000000000000003 R12: ffff88810fbf3a80
R13: ffffed1021f7e8a4 R14: ffff88810fbf4528 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8881f5900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555893f54a8 CR3: 0000000116e04000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_pin_lock kernel/locking/lockdep.c:5621 [inline]
lock_pin_lock+0x1a9/0x2d0 kernel/locking/lockdep.c:5944
rq_pin_lock kernel/sched/sched.h:1771 [inline]
rq_lock kernel/sched/sched.h:1853 [inline]
ttwu_queue kernel/sched/core.c:4000 [inline]
try_to_wake_up+0x62d/0x1150 kernel/sched/core.c:4330
hrtimer_wakeup+0x47/0x60 kernel/time/hrtimer.c:2037
__run_hrtimer kernel/time/hrtimer.c:1801 [inline]
__hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x8b/0xb0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x621/0x6f0 kernel/printk/printk.c:2431
Code: 85 ed 0f 85 81 00 00 00 e8 7c ec 1f 00 9c 41 5c 41 81 e4 00 02 00 00 31 ff 4c 89 e6 e8 98 e7 1f 00 4d 85 e4 0f 85 8d 00 00 00 5a ec 1f 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00
RSP: 0018:ffffc9000190f9e8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000017 RCX: ffffffff815b670e
RDX: ffff88810fbf3a80 RSI: ffffffff815b6718 RDI: 0000000000000007
RBP: 1ffff92000321f3f R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000200 R14: ffff8881032d8000 R15: ffffc9000190fab0
_printk+0xc8/0x100 kernel/printk/printk.c:2457
m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline]
m920x_rc_query+0x496/0x770 drivers/media/usb/dvb-usb/m920x.c:193
legacy_dvb_usb_read_remote_control+0x10a/0x500 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
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