INFO: task kworker/0:2:717 blocked for more than 143 seconds. Not tainted 6.5.0-rc4-syzkaller-00075-g98a9e32bdf25 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:22752 pid:717 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 3 locks held by kworker/1:1/25: #0: ffff88810b7e8938 ( (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: ffffc900001b7d80 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0} , at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88f955e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4635 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 6 locks held by kworker/0:2/717: #0: ffff88810ca58138 ((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: ffffc900021efd80 ((work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff888105fe5190 (&dev->mutex ){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] ){....}-{3:3}, at: hub_event+0x1cc/0x5330 drivers/usb/core/hub.c:5777 #3: ffff8881162ef190 ( &dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: usb_disconnect+0x10a/0x890 drivers/usb/core/hub.c:2267 #4: ffff888106bdd160 (&dev->mutex ){....}-{3:3} , at: device_lock include/linux/device.h:958 [inline] , at: __device_driver_lock drivers/base/dd.c:1093 [inline] , at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1290 #5: ffffffff88f955e8 ( rtnl_mutex){+.+.}-{3:3} , at: unregister_netdev+0x12/0x30 net/core/dev.c:10923 1 lock held by dhcpcd/2413: 2 locks held by getty/2435: #0: ffff888114b08098 (&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/1:6/5527: #0: ffff88810ca58138 ((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: ffffc9000245fd80 ((work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffff888106305190 (&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: ffff888119af9190 (&dev->mutex ){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] ){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1003 #4: ffff888142162160 (&dev->mutex ){....}-{3:3}, at: device_lock include/linux/device.h:958 [inline] ){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1003 #5: ffffffff88f955e8 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_register_hw+0x2136/0x42c0 net/mac80211/main.c:1335 3 locks held by kworker/0:3/9250: #0: ffff88810b7e8938 ((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: ffffc9000e717d80 ( (work_completion)(&(&net->ipv6.addr_chk_work)->work) ){+.+.}-{0:0} , at: process_one_work+0x99e/0x16f0 kernel/workqueue.c:2571 #2: ffffffff88f955e8 (rtnl_mutex ){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4635 1 lock held by syz-executor.0/19529: #0: ffffffff88f955e8 (rtnl_mutex){+.+.}-{3:3} , at: rtnl_lock net/core/rtnetlink.c:78 [inline] , at: rtnetlink_rcv_msg+0x3e2/0xd30 net/core/rtnetlink.c:6421 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-syzkaller-00075-g98a9e32bdf25 #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 0 to CPUs 1: cdc_wdm 1-1:1.0: wdm_int_callback - 0 bytes NMI backtrace for cpu 1 CPU: 1 PID: 7949 Comm: kworker/1:9 Not tainted 6.5.0-rc4-syzkaller-00075-g98a9e32bdf25 #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:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data+0x21/0x90 kernel/kcov.c:236 Code: 2e 0f 1f 84 00 00 00 00 00 65 8b 05 51 62 b7 7e 49 89 f1 89 c6 49 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 c0 a7 03 00 00 01 ff 00 74 0e 85 f6 74 59 8b 82 3c 15 00 00 85 c0 74 4f 8b RSP: 0018:ffffc900026ff3b8 EFLAGS: 00000246 RAX: 0000000080000001 RBX: 0000000000000007 RCX: ffffffff86389d10 RDX: ffff888107b89d00 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffffff874e1c80 R08: 0000000000000001 R09: 0000000000000006 R10: 0000000000000009 R11: 00000000006fd2d8 R12: 0000000000000009 R13: 0000000000000001 R14: 0000000000000008 R15: 0000000000000009 FS: 0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c48576866 CR3: 00000001130d3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:341 vsnprintf+0x160/0x1870 lib/vsprintf.c:2773 sprintf+0xcd/0x100 lib/vsprintf.c:3021 print_time kernel/printk/printk.c:1327 [inline] info_print_prefix+0x258/0x350 kernel/printk/printk.c:1353 record_print_text+0x143/0x410 kernel/printk/printk.c:1402 printk_get_next_message+0x2ca/0x7c0 kernel/printk/printk.c:2809 console_emit_next_record kernel/printk/printk.c:2844 [inline] console_flush_all+0x39e/0xf50 kernel/printk/printk.c:2933 console_unlock+0xc6/0x1f0 kernel/printk/printk.c:3007 vprintk_emit+0x1c5/0x640 kernel/printk/printk.c:2307 vprintk+0x89/0xa0 kernel/printk/printk_safe.c:50 _printk+0xc8/0x100 kernel/printk/printk.c:2328 m920x_read drivers/media/usb/dvb-usb/m920x.c:40 [inline] m920x_rc_query+0x496/0x760 drivers/media/usb/dvb-usb/m920x.c:193 legacy_dvb_usb_read_remote_control+0x107/0x4f0 drivers/media/usb/dvb-usb/dvb-usb-remote.c:123 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