INFO: task kworker/1:3:9029 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/1:3 D27440 9029 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 usb_get_descriptor+0xc0/0x160 drivers/usb/core/message.c:652 usb_get_device_descriptor+0x71/0xd0 drivers/usb/core/message.c:924 hub_port_init+0x629/0x2970 drivers/usb/core/hub.c:4647 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 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 caif:caif_disconnect_client(): nothing to disconnect 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: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7680: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:769 1 lock held by syz-executor.5/7985: #0: (hrtimer_bases.lock){-.-.}, at: [] rq_lock kernel/sched/sched.h:1741 [inline] #0: (hrtimer_bases.lock){-.-.}, at: [] __schedule+0x1df/0x1de0 kernel/sched/core.c:3321 1 lock held by syz-executor.1/7990: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b9/0xad0 arch/x86/mm/fault.c:1371 5 locks held by kworker/1:3/9029: #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 syz-executor.5/28974: #0: (&mapping->i_mmap_rwsem){++++}, at: [] i_mmap_lock_write include/linux/fs.h:473 [inline] #0: (&mapping->i_mmap_rwsem){++++}, at: [] unlink_file_vma+0x71/0xb0 mm/mmap.c:152 2 locks held by syz-executor.4/28972: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b9/0xad0 arch/x86/mm/fault.c:1371 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6246 2 locks held by syz-executor.1/28979: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2b9/0xad0 arch/x86/mm/fault.c:1371 #1: (&mapping->i_mmap_rwsem){++++}, at: [] i_mmap_lock_read include/linux/fs.h:483 [inline] #1: (&mapping->i_mmap_rwsem){++++}, at: [] rmap_walk_file+0x41d/0x810 mm/rmap.c:1819 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 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: 28369 Comm: kworker/u4:0 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_iv_send_outstanding_bat_ogm_packet task: ffff8880549f6340 task.stack: ffff8880454c0000 RIP: 0010:__rcu_read_unlock+0xf8/0x160 kernel/rcu/update.c:262 RSP: 0018:ffff8880454c7c38 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: ffff8880549f6340 RCX: 1ffffffff11987ac RDX: 1ffff1100a93ecd8 RSI: ffffffff87cce9c0 RDI: ffff8880549f66c4 RBP: ffff8880549f66c0 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880549f6c40 R11: ffff8880549f6340 R12: 0000000000000007 R13: ffff888093e3c480 R14: ffff888093e3c480 R15: ffff888093e3c518 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0276d5000 CR3: 000000005766e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:684 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:943 [inline] batadv_iv_ogm_schedule_buff+0x5cb/0xf80 net/batman-adv/bat_iv_ogm.c:997 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1041 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1034 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x500/0x6f0 net/batman-adv/bat_iv_ogm.c:1859 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: 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 62 8b 83 84 03 00 00 85 c0 75 69 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 42 c7 83 80 03 00 00 00 00 00