INFO: task kworker/0:1:24 blocked for more than 140 seconds. Not tainted 4.14.232-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D26656 24 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 usb_kill_urb.part.0+0x125/0x190 drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 drivers/usb/core/message.c:151 hub_port_init+0xfdc/0x2970 drivers/usb/core/hub.c:4555 hub_port_connect drivers/usb/core/hub.c:4905 [inline] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline] port_event drivers/usb/core/hub.c:5194 [inline] hub_event+0x18fd/0x3d70 drivers/usb/core/hub.c:5274 befs: Unrecognized mount option "obj_user=ÿÿ" or missing value befs: (loop1): cannot parse mount options process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Showing all locks held in the system: 5 locks held by kworker/0:1/24: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 drivers/usb/core/hub.c:4429 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.5/31996: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 1 lock held by syz-executor.5/31999: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 2 locks held by syz-executor.3/31988: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 #1: (rcu_preempt_state.barrier_mutex){+.+.}, at: [] _rcu_barrier+0x56/0x3b0 kernel/rcu/tree.c:3546 1 lock held by syz-executor.3/31995: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 1 lock held by syz-executor.1/31993: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 1 lock held by syz-executor.1/31998: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 1 lock held by syz-executor.2/31997: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 1 lock held by syz-executor.2/32003: #0: (br_ioctl_mutex){+.+.}, at: [] sock_ioctl+0x239/0x4c0 net/socket.c:1036 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13554 Comm: kworker/u4:7 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff888055d28680 task.stack: ffff8880431c0000 RIP: 0010:__lock_release kernel/locking/lockdep.c:3804 [inline] RIP: 0010:lock_release+0x524/0x870 kernel/locking/lockdep.c:4017 RSP: 0018:ffff8880431c7a48 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 1ffff11008638f4c RCX: 1ffff1100aba51eb RDX: 1ffff1100aba51e0 RSI: 0000000000000003 RDI: ffff888055d28680 RBP: 0000000000000002 R08: ffffffff8b9a95f8 R09: 0000000000000001 R10: 0000000000000000 R11: ffff888055d28680 R12: 76708223c93a67a7 R13: 0000000000000003 R14: ffff888055d28680 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bceb13f618 CR3: 000000009248e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:166 [inline] _raw_spin_unlock_irq+0x17/0x80 kernel/locking/spinlock.c:200 finish_lock_switch kernel/sched/sched.h:1346 [inline] finish_task_switch+0x178/0x610 kernel/sched/core.c:2675 context_switch kernel/sched/core.c:2811 [inline] __schedule+0x893/0x1de0 kernel/sched/core.c:3384 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3611 retint_kernel+0x1b/0x2d RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:413 [inline] RIP: 0010:batadv_nc_worker+0x5ba/0xc50 net/batman-adv/network-coding.c:726 RSP: 0018:ffff8880431c7cd8 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff88805651f0d8 RCX: 1ffff1100aba51eb RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffff888055d28680 R12: dffffc0000000000 R13: ffff8880abf40f00 R14: ffff88813fe1a8c0 R15: ffff8880a5922000 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: be 65 ff 0d df 23 c0 7e 0f 85 42 fc ff ff e8 d0 60 be ff e9 38 fc ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e de 02 00 00 45 8d 4f ff 45