On Tue, Aug 11, 2020 at 07:19:00PM +0200, Patrik Nilsson wrote: > Hi! > > I have an issue with a usb to sata adapter when much high speed data is > sent. If I erase my 4Tb SSD disk connected to the usb to sata interface with > a "slower" /dev/urandom it works, but if I exchanges this to /dev/zero the > disk is after a while disconnected. > > For logs from udev and more debug attempts see: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886172 > > Description: > > When the speed of data with a usb disk device is too high, the probes that > check if the disk still exists is missed. This makes the disk to be > unmounted and is remounted with an other drive letter (/dev/sdX). If this > disk is the root ("/"), the computer hangs. > > A usb SSD-disk (4 TB) connected to a USB port reproduce this bug easily. > This has never happened with a mechanical USB-drive. > > Symptoms and how to reproduce: > > 1) (Disk mounted as root) Computer hangs. Only way to get started again is a > hard reset. > > 2) (Erasing disk, not mounted as root) If you erase a disk with dd ("dd > if=/dev/zero of=/dev/sdX"), the disk disappears from the mounted list and > reappears as an other drive letter. In my case the data is redirected to > /dev/null and the fans speed up. The apparent data transfer speed is also > increased. Usually this happens after about 45 to 60 minutes. Can you provide kernel logs? Odds are the disk disconnects itself as it takes too much power or something. > 3) Fill RAM with programs and make sure the swap to this disk is used. > > Bug found in: > > $ uname -a > Linux pb-189b1884 5.4.0-40-generic #44-Ubuntu SMP Tue Jun 23 00:01:04 UTC > 2020 x86_64 x86_64 x86_64 GNU/Linux > > $ cat /proc/version_signature > Ubuntu 5.4.0-40.44-generic 5.4.44 That's a really old kernel, any chance you can try 5.8? thanks, greg k-h
