syzbot

INFO: task kworker/1:7:15147 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:7     state:D stack:22648 pid:15147 tgid:15147 ppid:2      task_flags:0x4288060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
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
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:747
 rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2143
 unregister_netdev+0x15/0x60 net/core/dev.c:12157
 usbnet_disconnect+0x109/0x500 drivers/net/usb/usbnet.c:1648
 usb_unbind_interface+0x1dd/0x9a0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:569 [inline]
 device_remove+0x125/0x170 drivers/base/dd.c:561
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
 bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
 device_del+0x396/0x9f0 drivers/base/core.c:3881
 usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
 usb_disconnect+0x2e1/0x9c0 drivers/usb/core/hub.c:2344
 hub_port_connect drivers/usb/core/hub.c:5406 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5866 [inline]
 hub_event+0x1aa0/0x5030 drivers/usb/core/hub.c:5948
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 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>

Showing all locks held in the system:
3 locks held by kworker/0:1/10:
 #0: ffff8881066f3d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc900000afd10
 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffff88810bf05198
 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5894
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
1 lock held by dhcpcd/2879:
2 locks held by getty/2902:
 #0: ffff8881123530a0 (
&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
6 locks held by kworker/1:3/5236:
 #0: 
ffff8881066f3d48
 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90003e0fd10
 ((work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: 
ffff88810b799198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
ffff88810b799198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5894
 #3: ffff88811d0ca198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #4: 
ffff88811ae3a160
 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #5: ffffffff8a3d5968 (rtnl_mutex
){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11218
6 locks held by kworker/1:4/5246:
 #0: ffff8881066f3d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc900020dfd10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffff88810bb69198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
 #2: ffff88810bb69198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5894
 #3: 
ffff88811f573198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #4: 
ffff88813ff42160 (
&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #5: 
ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11218
6 locks held by kworker/1:5/5256:
 #0: ffff8881066f3d48 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90011787d10 ((work_completion)(&hub->events)
){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffff88810bb89198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5894
 #3: ffff88811cbd8198
 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #4: ffff88811210c160 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
 #5: 
ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}
, at: wiphy_apply_custom_regulatory+0x239/0x3a0 net/wireless/reg.c:2654
6 locks held by kworker/1:7/15147:
 #0: ffff8881066f3d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90001a1fd10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffff88810b7a9198
 (&dev->mutex
){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5894
 #3: 
ffff888114aa4198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
ffff888114aa4198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x9c0 drivers/usb/core/hub.c:2335
 #4: ffff888116c08160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
 #4: ffff888116c08160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
 #4: ffff888116c08160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x620 drivers/base/dd.c:1292
 #5: ffffffff8a3d5968
 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2143
4 locks held by udevd/17842:
 #0: ffff888136008668
 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
 #1: ffff8881385f8088 (&of->mutex
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff8881356c43c8 (kn->active
#21){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: ffff88811f573198 (&dev->mutex
){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:889 [inline]
){....}-{4:4}, at: serial_show+0x26/0xa0 drivers/usb/core/sysfs.c:143
4 locks held by udevd/17856:
 #0: ffff8881336ceb08 (
&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
 #1: ffff888113974488 (&of->mutex){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff88811d95ef08 (kn->active
#18
){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: 
ffff88811cbd8198 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:889 [inline]
ffff88811cbd8198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
4 locks held by udevd/18143:
 #0: ffff8881317c9790
 (
&p->lock){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
 #1: ffff88811f319c88
 (&of->mutex){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff88811e8a8878 (kn->active#18){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: ffff88813f533198 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:889 [inline]
 #3: ffff88813f533198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
3 locks held by kworker/0:8/18746:
 #0: 
ffff888100081d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc90006bd7d10
 ((reg_check_chans).work
){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}, at: reg_check_chans_work+0x83/0x1170 net/wireless/reg.c:2483
3 locks held by kworker/u8:2/20495:
 #0: 
ffff88810efdf948
 ((wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc9000323fd10
 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 #2: ffffffff8a3d5968 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4738

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f #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:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5585 Comm: kworker/0:6 Not tainted 6.16.0-rc4-syzkaller-00311-gd1b07cc0868f #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events legacy_dvb_usb_read_remote_control
RIP: 0010:__lock_acquire+0x62b/0x1c90 kernel/locking/lockdep.c:5237
Code: 40 44 8b 15 87 96 20 09 45 85 d2 75 23 85 db 0f 85 66 04 00 00 4c 89 ef 89 4c 24 08 e8 9e ac ff ff 8b 4c 24 08 48 83 78 40 00 <0f> 84 a1 0a 00 00 0f b7 44 24 10 8b 74 24 18 44 8b 74 24 28 c1 e0
RSP: 0018:ffffc90000007b08 EFLAGS: 00000082
RAX: ffffffff8e714060 RBX: 0000000000000003 RCX: 0000000052f36c22
RDX: 0000000000000000 RSI: 00000000a53251bd RDI: ffff88810f2e8b20
RBP: ffff88810f2e8000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88810f2e8aa8
R13: ffff88810f2e8b20 R14: 0000000000000003 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888269162000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c7dd21000 CR3: 0000000132e34000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5871 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x135/0x3a0 lib/debugobjects.c:873
 debug_timer_deactivate kernel/time/timer.c:798 [inline]
 debug_deactivate kernel/time/timer.c:842 [inline]
 detach_timer kernel/time/timer.c:889 [inline]
 expire_timers kernel/time/timer.c:1781 [inline]
 __run_timers+0x5d5/0x960 kernel/time/timer.c:2372
 __run_timer_base kernel/time/timer.c:2384 [inline]
 __run_timer_base kernel/time/timer.c:2376 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2393
 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
 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:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x567/0x6d0 kernel/printk/printk.c:2449
Code: 00 4d 85 ed 0f 85 19 01 00 00 e8 64 52 20 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 c2 4d 20 00 48 85 ed 0f 85 25 01 00 00 <e8> 44 52 20 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00
RSP: 0018:ffffc90012b2fa38 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 000000000000003a RCX: ffffffff815d7ffc
RDX: ffff88810f2e8000 RSI: ffffffff815d8006 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff92002565f49
R13: 0000000000000200 R14: ffff8881022fd700 R15: ffffc90012b2fb00
 _printk+0xc7/0x100 kernel/printk/printk.c:2475
 legacy_dvb_usb_read_remote_control+0x40b/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 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>