INFO: task kworker/1:4:8195 blocked for more than 143 seconds. Not tainted 5.9.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:25792 pid: 8195 ppid: 2 flags:0x80004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0xec9/0x2280 kernel/sched/core.c:4527 schedule+0xd0/0x2a0 kernel/sched/core.c:4602 usb_kill_urb.part.0+0x197/0x220 drivers/usb/core/urb.c:696 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:691 usb_start_wait_urb+0x24a/0x2b0 drivers/usb/core/message.c:64 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153 hub_port_init+0x11ae/0x2d80 drivers/usb/core/hub.c:4689 hub_port_connect drivers/usb/core/hub.c:5140 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1e64/0x3e60 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1172: #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5852 1 lock held by systemd-udevd/3929: 1 lock held by in:imklog/6563: #0: ffff88809a1cd430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by agetty/6794: #0: ffff8880916d4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc900010102e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 3 locks held by syz-executor.0/6886: 5 locks held by kworker/1:4/8195: #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff88821a88e538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240 #1: ffffc900161bfda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244 #2: ffff888217401218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:785 [inline] #2: ffff888217401218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b6/0x3e60 drivers/usb/core/hub.c:5522 #3: ffff888217409588 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3012 [inline] #3: ffff888217409588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect drivers/usb/core/hub.c:5139 [inline] #3: ffff888217409588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] #3: ffff888217409588 (&port_dev->status_lock){+.+.}-{3:3}, at: port_event drivers/usb/core/hub.c:5494 [inline] #3: ffff888217409588 (&port_dev->status_lock){+.+.}-{3:3}, at: hub_event+0x1e4f/0x3e60 drivers/usb/core/hub.c:5576 #4: ffff888217bee968 (hcd->address0_mutex){+.+.}-{3:3}, at: hub_port_init+0x1b6/0x2d80 drivers/usb/core/hub.c:4563 4 locks held by kworker/u4:6/8843: 2 locks held by kworker/u4:11/17362: 1 lock held by syz-executor.5/26715: #0: ffff88804974eee8 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:26 [inline] #0: ffff88804974eee8 (&mm->mmap_lock#2){++++}-{3:3}, at: vm_mmap_pgoff+0x152/0x200 mm/util.c:504 1 lock held by syz-executor.5/26726: 1 lock held by syz-executor.1/26802: #0: ffffffff8b14d468 (rtnl_mutex){+.+.}-{3:3}, at: tc_new_tfilter+0x928/0x2130 net/sched/cls_api.c:2020 1 lock held by syz-executor.4/26780: 1 lock held by syz-executor.4/26785: #0: ffffffff8b14d468 (rtnl_mutex){+.+.}-{3:3}, at: sock_do_ioctl+0x1f2/0x2d0 net/socket.c:1060 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc7-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+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd7d/0x1000 kernel/hung_task.c:295 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9878 Comm: syz-executor.3 Not tainted 5.9.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:security_path_mkdir+0xda/0x160 security/security.c:1085 Code: db 74 60 e8 48 5f fa fd 45 0f b7 f6 48 bd 00 00 00 00 00 fc ff df e8 35 5f fa fd 48 8d 7b 18 48 89 f8 48 c1 e8 03 80 3c 28 00 <75> 57 44 89 f2 4c 89 fe 4c 89 ef ff 53 18 31 ff 41 89 c4 89 c6 e8 RSP: 0018:ffffc90008d2fe60 EFLAGS: 00000246 RAX: 1ffffffff14d5706 RBX: ffffffff8a6ab818 RCX: ffffffff837bdf84 RDX: ffff88804fb92440 RSI: ffffffff837bdf5b RDI: ffffffff8a6ab830 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff88804fb92d20 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc90008d2fed0 R14: 00000000000001ff R15: ffff888083683620 FS: 000000000295a940(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000748138 CR3: 00000000534d7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_mkdirat+0x14b/0x2d0 fs/namei.c:3670 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d2c7 Code: 1f 40 00 b8 5a 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd bf fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 bd bf fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcbf8313c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00000000000c9a49 RCX: 000000000045d2c7 RDX: 00007ffcbf831415 RSI: 00000000000001ff RDI: 00007ffcbf831410 RBP: 0000000000000647 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000064 R11: 0000000000000202 R12: 0000000000000008 R13: 00007ffcbf831400 R14: 00000000000c9586 R15: 00007ffcbf831410