EXT4-fs (loop4): mounted filesystem without journal. Opts: ,errors=continue INFO: task kworker/0:0:20590 blocked for more than 140 seconds. Not tainted 4.19.167-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D27760 20590 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:697 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:692 usb_start_wait_urb+0x252/0x4c0 drivers/usb/core/message.c:63 usb_internal_control_msg drivers/usb/core/message.c:101 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:152 hub_port_init+0x12d9/0x2fa0 drivers/usb/core/hub.c:4654 hub_port_connect drivers/usb/core/hub.c:5020 [inline] hub_port_connect_change drivers/usb/core/hub.c:5203 [inline] port_event drivers/usb/core/hub.c:5311 [inline] hub_event+0x1cf8/0x43f0 drivers/usb/core/hub.c:5391 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 3 locks held by kworker/u4:2/32: #0: 00000000363136f6 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1824 [inline] #0: 00000000363136f6 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 0000000084ebb9e4 ((work_completion)(&sdata->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 #2: 000000001c0077e6 (&wdev->mtx){+.+.}, at: sdata_lock net/mac80211/ieee80211_i.h:990 [inline] #2: 000000001c0077e6 (&wdev->mtx){+.+.}, at: ieee80211_ibss_work+0x85/0xe10 net/mac80211/ibss.c:1675 1 lock held by khungtaskd/1567: #0: 0000000028ba18a9 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7786: #0: 00000000c3b223a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 5 locks held by kworker/0:0/20590: #0: 00000000cc9b5823 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126 #1: 0000000017f0846c ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 #2: 00000000d09dcc87 (&dev->mutex){....}, at: device_lock include/linux/device.h:1173 [inline] #2: 00000000d09dcc87 (&dev->mutex){....}, at: hub_event+0x11b/0x43f0 drivers/usb/core/hub.c:5337 #3: 00000000fe6ef45d (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2977 [inline] #3: 00000000fe6ef45d (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5019 [inline] #3: 00000000fe6ef45d (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5203 [inline] #3: 00000000fe6ef45d (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5311 [inline] #3: 00000000fe6ef45d (&port_dev->status_lock){+.+.}, at: hub_event+0x1ce3/0x43f0 drivers/usb/core/hub.c:5391 #4: 00000000b0a3599a (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b6/0x2fa0 drivers/usb/core/hub.c:4528 2 locks held by syz-executor.5/29618: #0: 00000000363136f6 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1824 [inline] #0: 00000000363136f6 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 0000000028ba18a9 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 0000000028ba18a9 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 4.19.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4694 Comm: systemd-udevd Not tainted 4.19.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:irqtime_account_irq+0x1d/0x280 kernel/sched/cputime.c:55 Code: 00 4c 89 ff e8 d4 b5 56 00 eb 97 90 90 41 54 55 48 89 fd 53 48 c7 c3 d0 e6 01 00 48 83 ec 08 e8 09 f2 3b 02 8b 15 13 1b 22 0b <85> d2 75 09 48 83 c4 08 5b 5d 41 5c c3 48 ba 00 00 00 00 00 fc ff RSP: 0018:ffff8880ba107f88 EFLAGS: 00000006 RAX: 0000000000000001 RBX: 000000000001e6d0 RCX: ffffffff838034c3 RDX: 0000000000000001 RSI: ffffffff838034d1 RDI: 0000000000000005 RBP: ffff88809ca16680 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: ffffffff8c65d05b R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff66980c8c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d6dd6ad558 CR3: 000000009cbd4000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: account_irq_exit_time include/linux/vtime.h:114 [inline] irq_exit+0x49/0x260 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:545 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__rcu_read_lock+0x0/0x40 kernel/rcu/tree_plugin.h:405 Code: 07 48 83 e0 fc c3 0f 1f 40 00 f0 83 44 24 fc 00 48 8b 05 9b 90 a5 08 f0 83 44 24 fc 00 48 83 c0 07 48 83 e0 fc c3 0f 1f 40 00 <48> b8 00 00 00 00 00 fc ff df 53 65 48 8b 1c 25 80 df 01 00 48 8d RSP: 0018:ffff88809ca1fad0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff88809ca16680 RBX: 0000000000000040 RCX: ffffffff81a8a9ff RDX: 0000000000000000 RSI: ffffffff81a8aa0c RDI: 0000000000000005 RBP: ffff88809ca1fb60 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 00000000e7493682 R12: ffff88809ca1fce0 R13: 0000000000000043 R14: 0000000000000003 R15: ffff88809ca1fe90 rcu_read_lock include/linux/rcupdate.h:625 [inline] path_init+0xb51/0x19d0 fs/namei.c:2180 path_openat+0x185/0x2df0 fs/namei.c:3535 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff6686579b1 Code: f7 d8 bf ff ff ff ff 64 89 02 eb cb 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 80 3f 00 74 1b be 00 08 09 00 b8 02 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 1f 89 c7 e9 00 ff ff ff 48 8b 05 b1 54 2e 00 RSP: 002b:00007fff727a6f58 EFLAGS: 00000202 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055d6dd695490 RCX: 00007ff6686579b1 RDX: 00000000000000fe RSI: 0000000000090800 RDI: 000055d6dd681550 RBP: 00007ff66980c710 R08: 000055d6dd66d630 R09: 0000000000001010 R10: 00007ff66893db58 R11: 0000000000000202 R12: 0000000000000000 R13: 000055d6dd681550 R14: 00000000000000fe R15: 000055d6dd681550