Subject: [syzbot] INFO: task hung in port100_probe

From: syzbot <[email-masked]>
Date: Tue, 22 Jun 2021 08:43:29 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    fd0aa1a4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13e1500c300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7ca96a2d153c74b0
dashboard link: https://syzkaller.appspot.com/bug?extid=abd2e0dafb481b621869
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1792e284300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13ad9d48300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

INFO: task kworker/0:1:7 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1     state:D stack:25584 pid:    7 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 port100_send_cmd_sync drivers/nfc/port100.c:923 [inline]
 port100_get_command_type_mask drivers/nfc/port100.c:1008 [inline]
 port100_probe+0x9e4/0x1340 drivers/nfc/port100.c:1554
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556
 hub_port_connect drivers/usb/core/hub.c:5276 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5416 [inline]
 port_event drivers/usb/core/hub.c:5562 [inline]
 hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2424
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task kworker/1:2:3367 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D stack:25552 pid: 3367 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 port100_send_cmd_sync drivers/nfc/port100.c:923 [inline]
 port100_get_command_type_mask drivers/nfc/port100.c:1008 [inline]
 port100_probe+0x9e4/0x1340 drivers/nfc/port100.c:1554
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556
 hub_port_connect drivers/usb/core/hub.c:5276 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5416 [inline]
 port_event drivers/usb/core/hub.c:5562 [inline]
 hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2424
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task kworker/1:3:4871 blocked for more than 144 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:3     state:D stack:25584 pid: 4871 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 port100_send_cmd_sync drivers/nfc/port100.c:923 [inline]
 port100_get_command_type_mask drivers/nfc/port100.c:1008 [inline]
 port100_probe+0x9e4/0x1340 drivers/nfc/port100.c:1554
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556
 hub_port_connect drivers/usb/core/hub.c:5276 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5416 [inline]
 port_event drivers/usb/core/hub.c:5562 [inline]
 hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2424
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task kworker/1:0:8456 blocked for more than 144 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:25936 pid: 8456 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 port100_send_cmd_sync drivers/nfc/port100.c:923 [inline]
 port100_get_command_type_mask drivers/nfc/port100.c:1008 [inline]
 port100_probe+0x9e4/0x1340 drivers/nfc/port100.c:1554
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556
 hub_port_connect drivers/usb/core/hub.c:5276 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5416 [inline]
 port_event drivers/usb/core/hub.c:5562 [inline]
 hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2424
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task kworker/1:1:8462 blocked for more than 145 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:25960 pid: 8462 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x168/0x270 kernel/sched/completion.c:138
 port100_send_cmd_sync drivers/nfc/port100.c:923 [inline]
 port100_get_command_type_mask drivers/nfc/port100.c:1008 [inline]
 port100_probe+0x9e4/0x1340 drivers/nfc/port100.c:1554
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 really_probe+0x291/0xf60 drivers/base/dd.c:576
 driver_probe_device+0x298/0x410 drivers/base/dd.c:763
 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
 __device_attach+0x228/0x4b0 drivers/base/dd.c:938
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
 device_add+0xbe0/0x2100 drivers/base/core.c:3324
 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556
 hub_port_connect drivers/usb/core/hub.c:5276 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5416 [inline]
 port_event drivers/usb/core/hub.c:5562 [inline]
 hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x82b/0x1120 kernel/workqueue.c:2424
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
INFO: task syz-executor195:8751 blocked for more than 145 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor195 state:D stack:28016 pid: 8751 ppid:  8448 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285
 __mutex_lock_common kernel/locking/mutex.c:1036 [inline]
 __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x402af7
RSP: 002b:00007ffc0cb8ab80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 0000000000402af7
RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c
RBP: 000000000048803b R08: 00007ffc0cb8ac68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc0cb8ccdc R14: 0000000000000036 R15: 00007ffc0cb8cce0
INFO: task syz-executor195:8758 blocked for more than 145 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor195 state:D stack:28144 pid: 8758 ppid:  8447 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285
 __mutex_lock_common kernel/locking/mutex.c:1036 [inline]
 __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x402af7
RSP: 002b:00007ffc0cb8ab80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 0000000000402af7
RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c
RBP: 000000000048803b R08: 00007ffc0cb8ac68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc0cb8ccdc R14: 0000000000000036 R15: 00007ffc0cb8cce0
INFO: task syz-executor195:8778 blocked for more than 146 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor195 state:D stack:28144 pid: 8778 ppid:  8445 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285
 __mutex_lock_common kernel/locking/mutex.c:1036 [inline]
 __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x402af7
RSP: 002b:00007ffc0cb8ab80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 0000000000402af7
RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c
RBP: 000000000048803b R08: 00007ffc0cb8ac68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc0cb8ccdc R14: 0000000000000036 R15: 00007ffc0cb8cce0
INFO: task syz-executor195:8784 blocked for more than 146 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor195 state:D stack:28144 pid: 8784 ppid:  8446 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285
 __mutex_lock_common kernel/locking/mutex.c:1036 [inline]
 __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x402af7
RSP: 002b:00007ffc0cb8ab80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 0000000000402af7
RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c
RBP: 000000000048803b R08: 00007ffc0cb8ac68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc0cb8ccdc R14: 0000000000000036 R15: 00007ffc0cb8cce0
INFO: task syz-executor195:8792 blocked for more than 146 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor195 state:D stack:28144 pid: 8792 ppid:  8442 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5285
 __mutex_lock_common kernel/locking/mutex.c:1036 [inline]
 __mutex_lock+0x7d4/0x10c0 kernel/locking/mutex.c:1104
 misc_open+0x55/0x4a0 drivers/char/misc.c:107
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b9/0x11b0 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x402af7
RSP: 002b:00007ffc0cb8ab80 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000200000c0 RCX: 0000000000402af7
RDX: 0000000000000002 RSI: 000000000048803b RDI: 00000000ffffff9c
RBP: 000000000048803b R08: 00007ffc0cb8ac68 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffc0cb8ccdc R14: 0000000000000036 R15: 00007ffc0cb8cce0

Showing all locks held in the system:
3 locks held by kworker/0:0/5:
5 locks held by kworker/0:1/7:
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2247
 #1: ffffc90000cc7da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2251
 #2: ffff8880215bc220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #2: ffff8880215bc220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5590
 #3: ffff8880143f6220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #3: ffff8880143f6220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
 #4: ffff88802d51b1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #4: ffff88802d51b1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
1 lock held by khungtaskd/1643:
 #0: ffffffff8bf79620 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6333
5 locks held by kworker/1:2/3367:
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2247
 #1: ffffc90003027da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2251
 #2: ffff8880214df220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #2: ffff8880214df220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5590
 #3: ffff888019014220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #3: ffff888019014220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
 #4: ffff8880190171a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #4: ffff8880190171a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
5 locks held by kworker/1:3/4871:
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2247
 #1: ffffc9000b01fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2251
 #2: ffff88802168b220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #2: ffff88802168b220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5590
 #3: ffff88802d05d220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #3: ffff88802d05d220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
 #4: ffff8880190131a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #4: ffff8880190131a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
1 lock held by in:imklog/8343:
 #0: ffff8880147e6870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974
5 locks held by kworker/1:0/8456:
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2247
 #1: ffffc900016cfda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2251
 #2: ffff8880216c3220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #2: ffff8880216c3220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5590
 #3: ffff88802d059220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #3: ffff88802d059220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
 #4: ffff888030fe51a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #4: ffff888030fe51a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
5 locks held by kworker/1:1/8462:
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0: ffff8880198c2d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1600 kernel/workqueue.c:2247
 #1: ffffc900016dfda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1600 kernel/workqueue.c:2251
 #2: ffff88823bc62a20 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #2: ffff88823bc62a20 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5590
 #3: ffff888030fe7220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #3: ffff888030fe7220 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
 #4: ffff8880190151a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:742 [inline]
 #4: ffff8880190151a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4b0 drivers/base/dd.c:913
1 lock held by syz-executor195/8751:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor195/8758:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor195/8778:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor195/8784:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
1 lock held by syz-executor195/8792:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
2 locks held by syz-executor195/8814:
 #0: ffffffff8c99e6e8 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x55/0x4a0 drivers/char/misc.c:107
 #1: ffffffff8be49fe8 (system_transition_mutex){+.+.}-{3:3}, at: snapshot_open+0x3b/0x2a0 kernel/power/user.c:54

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

NMI backtrace for cpu 1
CPU: 1 PID: 1643 Comm: khungtaskd Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 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+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4850 Comm: systemd-journal Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0033:0x7fbb9961e46c
Code: d1 49 89 e1 31 d2 41 b8 10 00 00 00 41 89 f6 49 89 e7 e8 57 fc ff ff 85 c0 41 89 c4 0f 88 5f ff ff ff 48 8b 04 24 4c 8b 40 08 <4d> 85 c0 0f 84 bb 00 00 00 49 83 f8 0f 0f 87 e1 00 00 00 e8 6c 7b
RSP: 002b:00007ffc2e6bdca0 EFLAGS: 00000202
RAX: 00007fbb96c1b798 RBX: 000000000016c798 RCX: 000000000016c798
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 00005570395fa120
RBP: 00005570395f9e80 R08: 0000000000001608 R09: 00005570395fa120
R10: 00007ffc2e6cf090 R11: 00007fbb96da6658 R12: 0000000000000001
R13: 00007ffc2e6bdd18 R14: 0000000000000006 R15: 00007ffc2e6bdca0
FS:  00007fbb999308c0 GS:  0000000000000000

---
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