You have been subscribed to a public bug:
== Comment: #63 - Halil Pasic <pa...@de.ibm.com> - 2022-03-28 17:33:34 ==
I'm pretty confident I've figured out what is going on.
>From the guest side, the decision whether the SCSI command was completed
>successfully or not comes down to looking at the sense data. Prior to commit
a108557bbf ("scsi: inline sg_io_sense_from_errno() into the callers."), we don't
build sense data as a response to seeing a host status presented by the host
SCSI stack (e.g. kernel).
Thus when the kernel tells us that a given SCSI command did not get completed
via
SCSI_HOST_TRANSPORT_DISRUPTED or SCSI_HOST_NO_LUN, we end up fooling the guest
into believing that the command completed successfully.
The guest kernel, and especially virtio and multipath are at no fault
(AFAIU). Given these facts, it isn't all that surprising, that we end up
with corruptions.
All we have to do is do backports for QEMU (when necessary). I didn't
investigate vhost-scsi -- my guess is, that it ain't affected.
How do we want to handle the back-ports?
== Comment: #66 - Halil Pasic <pa...@de.ibm.com> - 2022-04-04 05:36:33 ==
This is a proposed backport containing 7 patches in mbox format. I tried to
pick patches sanely, and all I had to do was basically resolving merge
conflicts.
I have to admit I have no extensive experience in doing such invasive
backports, and my knowledge of the QEMU SCSI stack is very limited. I
would be happy if the Ubuntu folks would have a good look at this, and
if possible improve on it.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-195744 severity-high
targetmilestone-inin---
--
Ubuntu 20.04.3 - ilzlnx3g1 - virtio-scsi devs on KVM guest having miscompares
on disktests when there is a failed path.
https://bugs.launchpad.net/bugs/1967814
You received this bug notification because you are a member of Kernel Packages,
which is subscribed to linux in Ubuntu.
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
