INFO: task kworker/1:6:5298 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00098-gd9216d3ef538 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:6 state:D stack:21584 pid:5298 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xc79/0x30a0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747 addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4635 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 INFO: task kworker/1:8:20089 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00098-gd9216d3ef538 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:8 state:D stack:22496 pid:20089 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0xc79/0x30a0 kernel/sched/core.c:6710 schedule+0xe7/0x1b0 kernel/sched/core.c:6786 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747 unregister_netdev+0x12/0x30 net/core/dev.c:10923 usbnet_disconnect+0xed/0x540 drivers/net/usb/usbnet.c:1621 usb_unbind_interface+0x1dd/0x8d0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1270 [inline] device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1293 bus_remove_device+0x22c/0x420 drivers/base/bus.c:574 device_del+0x39a/0xa40 drivers/base/core.c:3814 usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1421 usb_disconnect+0x2e1/0x890 drivers/usb/core/hub.c:2276 hub_port_connect drivers/usb/core/hub.c:5284 [inline] hub_port_connect_change drivers/usb/core/hub.c:5589 [inline] port_event drivers/usb/core/hub.c:5749 [inline] hub_event+0x2221/0x5330 drivers/usb/core/hub.c:5831 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 worker_thread+0x687/0x1110 kernel/workqueue.c:2748 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff87ea74b0 ( rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522 1 lock held by rcu_tasks_trace/13: #0: ffffffff87ea71b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xe20 kernel/rcu/tasks.h:522 1 lock held by khungtaskd/28: #0: ffffffff87ea80c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615 3 locks held by dhcpcd/2412: 2 locks held by getty/2434: #0: ffff888114d50098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000452f0 (&ldata->atomic_read_lock){+.+.}-{3:3} , at: n_tty_read+0xfcb/0x1480 drivers/tty/n_tty.c:2187 6 locks held by kworker/1:5/5297: #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] , at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] , at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] , at: set_work_data kernel/workqueue.c:675 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] , at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc90001c97d80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff888105f80190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] (&dev->mutex){....}-{3:3}, at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 #3: ffff8881128a4190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1003 #4: ffff88810664a160 ( &dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] &dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1003 #5: ffffffff88f953a8 (rtnl_mutex){+.+.}-{3:3}, at: register_netdev+0x13/0x50 net/core/dev.c:10177 3 locks held by kworker/1:6/5298: #0: ffff88810ab7f138 ((wq_completion)ipv6_addrconf ){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] , at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] , at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] , at: set_work_data kernel/workqueue.c:675 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] , at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc90001ca7d80 ( (work_completion)(&(&net->ipv6.addr_chk_work)->work) ){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88f953a8 (rtnl_mutex ){+.+.}-{3:3} , at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4635 3 locks held by kworker/0:6/5426: #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc900024afd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff88810635b190 (&dev->mutex ){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 3 locks held by kworker/0:8/15686: #0: ffff88810ca69138 ((wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] ){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] ){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] ){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] ){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] ){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] ){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000976fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff888105f87190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 5 locks held by kworker/0:10/17923: 6 locks held by kworker/1:8/20089: #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000f86fd80 ((work_completion)(&hub->events)){+.+.}-{0:0} , at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff8881063fb190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 #3: ffff88811b10a190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #3: ffff88811b10a190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x890 drivers/usb/core/hub.c:2267 #4: ffff888117069160 ( &dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] &dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1093 [inline] &dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1290 #5: ffffffff88f953a8 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdev+0x12/0x30 net/core/dev.c:10923 6 locks held by kworker/0:2/23132: #0: ffff88810ca69138 ((wq_completion)usb_hub_wq){+.+.}-{0:0} , at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] , at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] , at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] , at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] , at: set_work_data kernel/workqueue.c:675 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] , at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc900071efd80 ( (work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff8881063e3190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] #2: ffff8881063e3190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 #3: ffff8881063e6500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3185 [inline] #3: ffff8881063e6500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5341 [inline] #3: ffff8881063e6500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5589 [inline] #3: ffff8881063e6500 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5749 [inline] #3: ffff8881063e6500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x2ad8/0x5330 drivers/usb/core/hub.c:5831 #4: ffff888106382768 (hcd->address0_mutex){+.+.}-{3:3} , at: hub_port_connect drivers/usb/core/hub.c:5342 [inline] , at: hub_port_connect_change drivers/usb/core/hub.c:5589 [inline] , at: port_event drivers/usb/core/hub.c:5749 [inline] , at: hub_event+0x2afe/0x5330 drivers/usb/core/hub.c:5831 #5: ffffffff888d0e50 (ehci_cf_port_reset_rwsem){.+.+}-{3:3} , at: hub_port_reset+0x1a4/0x2000 drivers/usb/core/hub.c:3000 3 locks held by kworker/0:3/26545: #0: ffff88810ab7f138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:20 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: raw_atomic64_set include/linux/atomic/atomic-arch-fallback.h:2608 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: raw_atomic_long_set include/linux/atomic/atomic-long.h:79 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:3196 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:675 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:702 [inline] ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x96a/0x16f0 kernel/workqueue.c:2567 #1: ffffc9000296fd80 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88f953a8 (rtnl_mutex ){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4635 5 locks held by udevd/27711: #0: ffff88811762eac8 (&f->f_pos_lock){+.+.}-{3:3} , at: __fdget_pos+0x99/0xb0 fs/file.c:1046 #1: ffff888138d1d8b8 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xda/0x1280 fs/seq_file.c:182 #2: ffff8881171cb088 (&of->mutex){+.+.}-{3:3} , at: kernfs_seq_start+0x4b/0x460 fs/kernfs/file.c:154 #3: ffff888131f8f918 (kn->active#33){++++}-{0:0}, at: kernfs_seq_start+0x6f/0x460 fs/kernfs/file.c:155 #4: ffff8881128a4190 (&dev->mutex){....}-{3:3} , at: device_lock_interruptible include/linux/device.h:963 [inline] , at: serial_show+0x26/0xa0 drivers/usb/core/sysfs.c:143 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00098-gd9216d3ef538 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x27b/0x2e0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf29/0x11b0 kernel/hung_task.c:379 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5580 Comm: kworker/0:7 Not tainted 6.5.0-rc4-syzkaller-00098-gd9216d3ef538 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:__lock_acquire+0x31a/0x5de0 kernel/locking/lockdep.c:5080 Code: 02 00 0f 85 6d 3e 00 00 49 8d 45 18 4d 89 55 10 48 89 c2 48 89 44 24 50 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 5e 3e 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 0c 24 48 8b RSP: 0018:ffffc90000007b18 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 000000000000004f RCX: 1ffff110228294fe RDX: 1ffff110228294fd RSI: 00000000000005e0 RDI: ffff88811414a7d8 RBP: 0000000000000001 R08: 1ffff110228294f9 R09: 0000000000000001 R10: ffff8881f66294d8 R11: 0000000000008000 R12: 0000000000000000 R13: ffff88811414a7d0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562de69f9018 CR3: 0000000140c58000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 expire_timers kernel/time/timer.c:1747 [inline] __run_timers+0x58d/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x20b/0x94e kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xa7/0x110 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x8e/0xb0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1972 [inline] RIP: 0010:vprintk_emit+0x3f6/0x640 kernel/printk/printk.c:2306 Code: 00 00 e8 cd d8 1b 00 9c 8f 45 d0 48 8b 45 d0 31 ff 25 00 02 00 00 49 89 c6 48 89 c6 e8 43 d4 1b 00 4d 85 f6 0f 85 fa 01 00 00 0f 1e fa e8 a1 d8 1b 00 45 31 c9 41 b8 01 00 00 00 31 c9 68 a6 RSP: 0018:ffffc90006cf7b08 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 000000000000003a RCX: 0000000000000000 RDX: ffff888114149d00 RSI: ffffffff8130749a RDI: 0000000000000007 RBP: ffffc90006cf7b40 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 6979726575712065 R12: 0000000000000200 R13: ffff888104a55700 R14: 0000000000000001 R15: 0000000000000000 vprintk+0x89/0xa0 kernel/printk/printk_safe.c:50 _printk+0xc8/0x100 kernel/printk/printk.c:2328 legacy_dvb_usb_read_remote_control+0x403/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597 process_scheduled_works kernel/workqueue.c:2664 [inline] worker_thread+0x896/0x1110 kernel/workqueue.c:2750 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304