在Linux系统上挂载的usb存储器进入脱机状态，进程无法访问存储器上的文件系统。查看日志：
kernel: usb 2-5: cmd cmplt err -2 kernel: sd 8:0:0:0: [sda] tag#3 uas_zap_pending 0 uas-tag 4 inflight: CMD kernel: sd 8:0:0:0: [sda] tag#3 CDB: Write(10) 2a 00 56 85 3b 00 00 00 08 00 kernel: usb 2-5: reset high-speed USB device number 3 using xhci_hcd kernel: scsi host8: uas_eh_device_reset_handler success kernel: scsi host8: uas_eh_device_reset_handler start kernel: usb 2-5: reset high-speed USB device number 3 using xhci_hcd kernel: scsi host8: uas_eh_device_reset_handler success kernel: sd 8:0:0:0: Device offlined - not ready after error recovery
解决方案
cmd cmplt err-2表示USB存储的URB（USB请求块）无法完成。怀疑有硬件问题。
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