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    SubjectRe: [syzbot] INFO: task hung in port100_probe
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    Date
    On 22/07/2021 16:20, Krzysztof Kozlowski wrote:
    > On 22/06/2021 17:43, syzbot wrote:
    >> 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: syzbot+abd2e0dafb481b621869@syzkaller.appspotmail.com
    >>
    >> 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
    >>
    >>
    >> ---
    >> This report is generated by a bot. It may contain errors.
    >> See https://goo.gl/tpsmEJ for more information about syzbot.
    >> syzbot engineers can be reached at syzkaller@googlegroups.com.
    >>
    >> syzbot will keep track of this issue. See:
    >> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
    >> syzbot can test patches for this issue, for details see:
    >> https://goo.gl/tpsmEJ#testing-patches
    >
    > Cc: Thierry, Alan, Andrey,
    >
    > The issue is reproducible immediately on QEMU instance with
    > USB_DUMMY_HCD and USB_RAW_GADGET. I don't know about real port100 NFC
    > device.
    >
    > I spent some time looking into this and have no clue, except that it
    > looks like an effect of a race condition.
    >
    > 1. When using syskaller reproducer against one USB device (In the C
    > reproducer change the loop in main() to use procid=0) - issue does not
    > happen.
    >
    > 2. With two threads or more talking to separate Dummy USB devices, the
    > issue appears. The more of them, the better...
    >
    > 3. The reported problem is in missing complete. The correct flow is like:
    > port100_probe()
    > port100_get_command_type_mask()
    > port100_send_cmd_sync()
    > port100_send_cmd_async()
    > port100_submit_urb_for_ack()
    > port100_send_complete()
    > [ 63.363863] port100 2-1:0.0: NFC: Urb failure (status -71)
    > port100_recv_ack()
    > [ 63.369942] port100 2-1:0.0: NFC: Urb failure (status -71)
    >
    > and schedule_work() which completes and unblocks port100_send_cmd_sync
    >
    > However in the failing case (hung task) the port100_recv_ack() is never
    > called. It looks like USB core / HCD / gadget does not send the Ack/URB
    > complete.
    >
    > I don't know why. The port100 NFC driver code looks OK, except it is not
    > prepared for missing ack/urb so it waits indefinitely. I could try to
    > convert it to wait_for_completion_timeout() but it won't be trivial and
    > more important - I am not sure if this is the problem. Somehow the ACK
    > with Urb failure is not sent back to the port100 device. Therefore I am
    > guessing that the race condition is somwhere in USB stack, not in
    > port100 driver.
    >
    > The lockdep and other testing tools did not find anything here.
    >
    > Anyone hints where the issue could be?

    Also syzbot report for pn533 NFC (and its code) looks very similar:
    https://lore.kernel.org/lkml/00000000000053e5bb05c7983666@google.com/

    Best regards,
    Best regards,
    Krzysztof

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