On Sun, Aug 16, 2020 at 05:31:09PM +0200, Patrik Nilsson wrote: > [ 7981.203457] perf: interrupt took too long (3133 > 3132), lowering kernel.perf_event_max_sample_rate to 63750 > [ 8263.612587] usb 2-2: USB disconnect, device number 3 Your device disconnected itself from the bus, that is an electrical thing that the kernel can not control/prevent/change. > [ 8263.628508] blk_update_request: I/O error, dev sdb, sector 2678161400 op 0x1:(WRITE) flags 0x0 phys_seg 1674 prio class 0 > [ 8263.628515] Buffer I/O error on dev sdb, logical block 2678161400, lost async page write > [ 8263.628519] Buffer I/O error on dev sdb, logical block 2678161401, lost async page write > [ 8263.628521] Buffer I/O error on dev sdb, logical block 2678161402, lost async page write > [ 8263.628524] Buffer I/O error on dev sdb, logical block 2678161403, lost async page write > [ 8263.628526] Buffer I/O error on dev sdb, logical block 2678161404, lost async page write > [ 8263.628528] Buffer I/O error on dev sdb, logical block 2678161405, lost async page write > [ 8263.628530] Buffer I/O error on dev sdb, logical block 2678161406, lost async page write > [ 8263.628533] Buffer I/O error on dev sdb, logical block 2678161407, lost async page write > [ 8263.628538] Buffer I/O error on dev sdb, logical block 2678161408, lost async page write > [ 8263.628541] Buffer I/O error on dev sdb, logical block 2678161409, lost async page write > [ 8263.629271] blk_update_request: I/O error, dev sdb, sector 2678163074 op 0x1:(WRITE) flags 0x4000 phys_seg 2048 prio class 0 > [ 8263.630073] blk_update_request: I/O error, dev sdb, sector 2678165122 op 0x1:(WRITE) flags 0x0 phys_seg 6 prio class 0 > [ 8263.630146] blk_update_request: I/O error, dev sdb, sector 2678165128 op 0x1:(WRITE) flags 0x800 phys_seg 112 prio class 0 > [ 8263.630879] sd 4:0:0:0: [sdb] Synchronizing SCSI cache > [ 8263.630912] sd 4:0:0:0: [sdb] Synchronize Cache(10) failed: Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK > [ 8263.630974] scsi 4:0:0:0: rejecting I/O to dead device > [ 8263.630980] blk_update_request: I/O error, dev sdb, sector 2678165240 op 0x1:(WRITE) flags 0x0 phys_seg 104 prio class 0 > [ 8275.232507] usb 2-2: new SuperSpeed Gen 1 USB device number 10 using xhci_hcd And now it came back. So I really think this device is just sucking up too much power and eventually the hub disconnects it (or it disconnects itself by dropping the voltage too low) and then adds itself again. If you write data "slower" to it, it's fine, but by writing 0's to your device, it's constantly hammered and that's the hardest thing for a flash device to handle (flash starts out at all bits set and then drops them as needed to 0, so you are asking for the most work possible to be done by the flash chips.) It might be better to just buy a different disk drive :) sorry, greg k-h
