INFO: task syz-executor.0:14003 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27032 14003 19709 0x80000002 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 device_lock include/linux/device.h:1174 [inline] usbdev_release+0x83/0x420 drivers/usb/core/devio.c:1049 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fda1bbcfc1f Code: Bad RIP value. RSP: 002b:00007fda1a591b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: 0000000000000007 RBX: 0000000000000007 RCX: 00007fda1bbcfc1f RDX: 0000000000000007 RSI: 00007fda1a591bc0 RDI: 000000000000000b RBP: 000000000000000b R08: 0000000000000000 R09: 00007fda1a591b10 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fda1bc669f8 R13: 00007fda1a591bc0 R14: 0000000000000000 R15: 0000000000022000 Showing all locks held in the system: 5 locks held by kworker/1:1/52: #0: 0000000073a4429e ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000713f206d ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000084e12ae6 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #2: 0000000084e12ae6 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387 #3: 00000000689a023e (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline] #3: 00000000689a023e (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline] #3: 00000000689a023e (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline] #3: 00000000689a023e (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline] #3: 00000000689a023e (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441 #4: 000000001fce72f1 (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578 1 lock held by khungtaskd/1570: #0: 00000000e2d67743 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by systemd-journal/4695: #0: 00000000e1fa875a (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000e1fa875a (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 1 lock held by in:imklog/7810: 2 locks held by kworker/u4:8/25867: 1 lock held by syz-executor.0/14003: #0: 0000000084e12ae6 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline] #0: 0000000084e12ae6 (&dev->mutex){....}, at: usbdev_release+0x83/0x420 drivers/usb/core/devio.c:1049 2 locks held by syz-executor.5/19728: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-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/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 19769 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0033:0x7fe6413761b5 Code: c0 83 f0 3d 8d 04 c0 89 c7 c1 ef 04 31 f8 69 c0 2d eb d4 27 31 c5 c1 e8 0f 31 c5 80 3d e4 e1 09 01 00 75 81 44 0f b6 6c 24 0f <44> 8d 4d 04 89 e8 41 89 c0 41 81 e0 ff 1f 00 00 43 8b 14 84 39 d5 RSP: 002b:00007ffd3486b160 EFLAGS: 00000246 RAX: 00000000000103eb RBX: 00007fe6414daff8 RCX: 0000001b2fb20000 RDX: ffffffff83772075 RSI: 0000001b2fb21970 RDI: 0000000009f34895 RBP: 000000000283f250 R08: ffffffff83771e31 R09: 000000003253460c R10: 00007ffd3486b330 R11: 0000000000000246 R12: 00007fe6414cf000 R13: 0000000000000001 R14: 00000000000034ca R15: ffffffff83772075 FS: 0000555556cc5400 GS: 0000000000000000