block nbd2: shutting down sockets
block nbd2: shutting down sockets
block nbd2: Device being setup by another task
INFO: task kworker/0:0:5 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.
kworker/0:0     D27720     5      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+0x12dc/0x3120 drivers/usb/core/hub.c:4704
 hub_port_connect drivers/usb/core/hub.c:5070 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5253 [inline]
 port_event drivers/usb/core/hub.c:5361 [inline]
 hub_event+0x1ccd/0x44a0 drivers/usb/core/hub.c:5441
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 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:
5 locks held by kworker/0:0/5:
 #0: 0000000050b9df3f ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
 #1: 000000004cef4216 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
 #2: 000000006acceba7 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
 #2: 000000006acceba7 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387
 #3: 00000000d33e7f30 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline]
 #3: 00000000d33e7f30 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline]
 #3: 00000000d33e7f30 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline]
 #3: 00000000d33e7f30 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline]
 #3: 00000000d33e7f30 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441
 #4: 00000000991bb1bf (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578
1 lock held by khungtaskd/1571:
 #0: 00000000fa590a40 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4688 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:___bpf_prog_run+0x496/0x4e80 kernel/bpf/core.c:1389
Code: 14 18 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 db 3a 00 00 4d 0f bf 7e 02 49 01 cf 4c 89 f8 48 c1 e8 03 0f b6 14 18 <4c> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 8f 3d 00 00 41
RSP: 0018:ffff8880a122fa30 EFLAGS: 00000a02
RAX: 1ffff11014245fce RBX: dffffc0000000000 RCX: ffff8880a122fe70
RDX: 0000000000000000 RSI: ffffffff816c3aba RDI: ffffc90001ad206a
RBP: ffff8880a122fb00 R08: 0000000000000000 R09: 00000000c000003e
R10: 0000000000000006 R11: 0000000000000000 R12: ffffffff886fb460
R13: ffffed1014245f62 R14: ffffc90001ad2068 R15: ffff8880a122fe70
FS:  00007f2fbb8938c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2fb8dae000 CR3: 00000000a16b1000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace: