Hi Greg,
Can you provide kernel logs? Odds are the disk disconnects itself as it
takes too much power or something.
udev-kernel logs can be found:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886172
I have tested the usb to sata adapter directly connected to a computer
and connected to a externally powered usb hub. The bug behavior is the same.
One time when I tested the whole usb hub disconnected. I have a usb to
ethernet connected to it too. It vanished and appeared again. Doubt it
is power. The externally powered hub can deliver 4A, but I hope the usb
to sata only takes 2A.
That's a really old kernel, any chance you can try 5.8?
I'm downloading from
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git. Will
test it soon.
Best regards,
Patrik
On 11/08/2020 19:56, Greg KH wrote:
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
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