Hi,
>> Root Cause
>> - Block layer timeout happens after power off UAS USB device which is
>> accessed as reproduce step. During timeout error handler process, scsi host
>> state becomes SHOST_CANCEL_RECOVERY that causes IO hangs up and lock cannot
>> be released. And in final, usb subsystem
The issue happens with following steps:
Access usb3.0/3.1 device that uses uas driver.
Power off hub port connecting device by ioctl(USBDEVFS_CONTROL).
Wait longer than 30s(scsi layer timeout period is 30s).
Execute commands like lsusb, no response and usb subsytem hangs.
After scsi layer
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