[619072.312087] usb 2-2: new high-speed USB device number 12 using xhci_hcd [619072.328765] usb 2-2: config 1 interface 1 altsetting 0 bulk endpoint 0x83 has invalid maxpacket 64 [619072.328774] usb 2-2: config 1 interface 1 altsetting 0 bulk endpoint 0x4 has invalid maxpacket 64 [619072.329172] usb 2-2: New USB device found, idVendor=1366, idProduct=1015 [619072.329178] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [619072.329182] usb 2-2: Product: J-Link [619072.329186] usb 2-2: Manufacturer: SEGGER [619072.329190] usb 2-2: SerialNumber: 000680556547 [619077.326878] cdc_acm 2-2:1.0: ttyACM0: USB ACM device [619077.328935] usb-storage 2-2:1.3: USB Mass Storage device detected [619077.329066] scsi12 : usb-storage 2-2:1.3 [619078.326293] scsi 12:0:0:0: Direct-Access SEGGER MSD Volume 1.00 PQ: 0 ANSI: 4 [619078.326797] sd 12:0:0:0: Attached scsi generic sg1 type 0 [619078.327236] sd 12:0:0:0: [sdb] 8000 512-byte logical blocks: (4.09 MB/3.90 MiB) [619078.327412] sd 12:0:0:0: [sdb] Write Protect is off [619078.327420] sd 12:0:0:0: [sdb] Mode Sense: 0b 00 00 08 [619078.327736] sd 12:0:0:0: [sdb] No Caching mode page found [619078.327746] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.331310] sd 12:0:0:0: [sdb] No Caching mode page found [619078.331322] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.332452] sdb: [619078.334054] sd 12:0:0:0: [sdb] No Caching mode page found [619078.334061] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.334067] sd 12:0:0:0: [sdb] Attached SCSI removable disk ************************************ Above Works, Open close some times Below does not, which is the same.: ************************************ [619072.312087] usb 2-2: new high-speed USB device number 12 using xhci_hcd [619072.328765] usb 2-2: config 1 interface 1 altsetting 0 bulk endpoint 0x83 has invalid maxpacket 64 [619072.328774] usb 2-2: config 1 interface 1 altsetting 0 bulk endpoint 0x4 has invalid maxpacket 64 [619072.329172] usb 2-2: New USB device found, idVendor=1366, idProduct=1015 [619072.329178] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [619072.329182] usb 2-2: Product: J-Link [619072.329186] usb 2-2: Manufacturer: SEGGER [619072.329190] usb 2-2: SerialNumber: 000680556547 [619077.326878] cdc_acm 2-2:1.0: ttyACM0: USB ACM device [619077.328935] usb-storage 2-2:1.3: USB Mass Storage device detected [619077.329066] scsi12 : usb-storage 2-2:1.3 [619078.326293] scsi 12:0:0:0: Direct-Access SEGGER MSD Volume 1.00 PQ: 0 ANSI: 4 [619078.326797] sd 12:0:0:0: Attached scsi generic sg1 type 0 [619078.327236] sd 12:0:0:0: [sdb] 8000 512-byte logical blocks: (4.09 MB/3.90 MiB) [619078.327412] sd 12:0:0:0: [sdb] Write Protect is off [619078.327420] sd 12:0:0:0: [sdb] Mode Sense: 0b 00 00 08 [619078.327736] sd 12:0:0:0: [sdb] No Caching mode page found [619078.327746] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.331310] sd 12:0:0:0: [sdb] No Caching mode page found [619078.331322] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.332452] sdb: [619078.334054] sd 12:0:0:0: [sdb] No Caching mode page found [619078.334061] sd 12:0:0:0: [sdb] Assuming drive cache: write through [619078.334067] sd 12:0:0:0: [sdb] Attached SCSI removable disk