INFO: task kworker/0:0:15620 blocked for more than 143 seconds. Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:23040 pid:15620 ppid:2 flags:0x00004000 Workqueue: events console_callback Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0xc79/0x30a0 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 schedule_timeout+0x27a/0x2c0 kernel/time/timer.c:2143 ___down_common kernel/locking/semaphore.c:225 [inline] __down_common+0x328/0x6c0 kernel/locking/semaphore.c:246 down+0x74/0xa0 kernel/locking/semaphore.c:63 console_lock+0x96/0x150 kernel/printk/printk.c:2652 console_callback+0x63/0x4c0 drivers/tty/vt/vt.c:2933 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Showing all locks held in the system: 5 locks held by kworker/0:1/9: #0: ffff88810a279538 ((wq_completion)usb_hub_wq ){+.+.}-{0:0} , at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602 #1: ffffc9000009fd88 ( (work_completion)(&hub->events) ){+.+.}-{0:0} , at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605 #2: ffff888106386190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:992 [inline] , at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768 #3: ffff888106399500 (&port_dev->status_lock ){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3138 [inline] ){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5337 [inline] ){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] ){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5740 [inline] ){+.+.}-{3:3}, at: hub_event+0x28b4/0x4f30 drivers/usb/core/hub.c:5822 #4: ffff888103f96768 (hcd->address0_mutex){+.+.}-{3:3} , at: hub_port_connect drivers/usb/core/hub.c:5338 [inline] , at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] , at: port_event drivers/usb/core/hub.c:5740 [inline] , at: hub_event+0x28da/0x4f30 drivers/usb/core/hub.c:5822 1 lock held by khungtaskd/29: #0: ffffffff87eac820 ( rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6607 2 locks held by getty/2441: #0: ffff888112d720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc5/0x1480 drivers/tty/n_tty.c:2206 6 locks held by kworker/1:3/5259: #0: ffff888100070d38 ( (wq_completion)events ){+.+.}-{0:0} , at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602 #1: ffffc90001fcfd88 ((work_completion)(&intf->reset_ws)){+.+.}-{0:0}, at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605 #2: ffff88811a68c190 (&dev->mutex ){....}-{3:3} , at: device_trylock include/linux/device.h:1002 [inline] , at: usb_lock_device_for_reset+0x184/0x330 drivers/usb/core/usb.c:898 #3: ffff8881063f1500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3138 [inline] #3: ffff8881063f1500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_reset_device+0x55a/0xad0 drivers/usb/core/hub.c:6218 #4: ffff88810475cf68 (hcd->address0_mutex){+.+.}-{3:3}, at: usb_reset_and_verify_device+0x2e3/0x10a0 drivers/usb/core/hub.c:6024 #5: ffffffff888e06b0 (ehci_cf_port_reset_rwsem){.+.+}-{3:3} , at: hub_port_reset+0x1a4/0x1dc0 drivers/usb/core/hub.c:2953 7 locks held by kworker/1:8/12886: 2 locks held by kworker/0:0/15620: #0: ffff888100070d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602 #1: ffffc900103f7d88 (console_work){+.+.}-{0:0}, at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605 7 locks held by kworker/1:9/21382: 4 locks held by kworker/1:11/21900: #0: ffff88810a279538 ( (wq_completion)usb_hub_wq ){+.+.}-{0:0}, at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602 #1: ffffc9000eed7d88 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605 #2: ffff88810639e190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:992 [inline] , at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768 #3: ffff8881063f1500 (&port_dev->status_lock ){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3138 [inline] ){+.+.}-{3:3}, at: hub_event+0x5c4/0x4f30 drivers/usb/core/hub.c:5821 3 locks held by kworker/1:12/22604: 4 locks held by udevd/22948: 6 locks held by kworker/1:14/25245: #0: ffff88810a279538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x774/0x15d0 kernel/workqueue.c:2602 #1: ffffc90001c1fd88 ((work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x7a7/0x15d0 kernel/workqueue.c:2605 #2: ffff888105f4f190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:992 [inline] (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f30 drivers/usb/core/hub.c:5768 #3: ffff888106302500 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3138 [inline] #3: ffff888106302500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5337 [inline] #3: ffff888106302500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] #3: ffff888106302500 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5740 [inline] #3: ffff888106302500 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x28b4/0x4f30 drivers/usb/core/hub.c:5822 #4: ffff8881043ec568 (hcd->address0_mutex){+.+.}-{3:3} , at: hub_port_connect drivers/usb/core/hub.c:5338 [inline] , at: hub_port_connect_change drivers/usb/core/hub.c:5580 [inline] , at: port_event drivers/usb/core/hub.c:5740 [inline] , at: hub_event+0x28da/0x4f30 drivers/usb/core/hub.c:5822 #5: ffffffff888e06b0 (ehci_cf_port_reset_rwsem){.+.+}-{3:3} , at: hub_port_reset+0x1a4/0x1dc0 drivers/usb/core/hub.c:2953 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 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+0x26c/0x2d0 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+0xfac/0x1230 kernel/hung_task.c:379 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11086 Comm: kworker/1:7 Not tainted 6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:task_h_load+0x3ed/0x650 kernel/sched/fair.c:9122 Code: 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 0f 85 8a 01 00 00 49 0f af 86 58 01 00 00 31 d2 48 83 c4 10 48 f7 f3 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 49 8d 86 68 01 00 00 4c 89 f3 49 RSP: 0018:ffffc90000198be0 EFLAGS: 00000082 RAX: 0000000000000186 RBX: 00000000000007f6 RCX: 1ffff110237a52ab RDX: 000000000000074c RSI: ffffffff8687cba0 RDI: ffff88811bd29558 RBP: 0000000000000000 R08: ffffc90000198d24 R09: ffffed1020ce87bc R10: ffff888106743de7 R11: fffffffffd87ddac R12: dffffc0000000000 R13: 00000001000328f9 R14: ffff88811bd29400 R15: ffff888106743a00 FS: 0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2568dff490 CR3: 000000011b7cc000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: detach_tasks kernel/sched/fair.c:8832 [inline] load_balance+0x1112/0x2ca0 kernel/sched/fair.c:11045 rebalance_domains+0x702/0xec0 kernel/sched/fair.c:11444 __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:1074 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+0x3d1/0x630 kernel/printk/printk.c:2306 Code: 00 00 e8 c2 1b 1c 00 9c 8f 45 d0 48 8b 45 d0 31 ff 25 00 02 00 00 49 89 c7 48 89 c6 e8 38 17 1c 00 4d 85 ff 0f 85 09 02 00 00 0f 1e fa e8 96 1b 1c 00 45 31 c9 41 b8 01 00 00 00 31 c9 68 d1 RSP: 0018:ffffc9000210fac0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000017 RCX: 0000000000000000 RDX: ffff8881178bba00 RSI: ffffffff813156d4 RDI: 0000000000000007 RBP: ffffc9000210faf8 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 65725f783032396d R12: 0000000000000200 R13: ffff888103665700 R14: 0000000000000000 R15: 0000000000000000 vprintk+0x7b/0x90 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2332 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+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304