qvm-block doesn't work with domU loop devices #3172

3hhh · Oct 13, 2017

Qubes OS version (e.g., `R3.2`):

4.0rc1
qubes-core-admin-client.noarch 4.0.7.0.1.fc25 from the current testing repo (it did work with e.g. 4.0.4)

Steps to reproduce the behavior:

Create a loop device in e.g. sys-usb.
Attempt to attach it to a different VM [domU] from dom0 using qvm-block a.

Expected behavior:

A device appears in [domU].

Actual behavior:

No device appears. qvm-block l however incorrectly shows a non-existing frontend device. In particular no error seems to be logged.

Related issues:

pretty identical bug in 3.2: #2126

General notes:

This is a regression from the current stable repo as it works in version 4.0.4 of the package.

If there's a workaround using e.g. xl block-attach or a downgrade method (cf. #3169), I'd be interested. I tried downgrading qubes-core-admin-client.noarch using yum, but that didn't pull the related dependencies.

Check kernel messages in target domain - maybe there was some error while attaching the device.

marmarek · Oct 13, 2017

Check kernel messages in target domain - maybe there was some error while attaching the device.

dmesg in domU shows absolutely nothing (last entry was something about iptables/netfilter that always comes up last during boot if I recall correctly).

It only happened after an update from 4.0.4 --> 4.0.7, i.e. I'm pretty sure it's a generic issue.

3hhh · Oct 13, 2017

dmesg in domU shows absolutely nothing (last entry was something about iptables/netfilter that always comes up last during boot if I recall correctly).

It only happened after an update from 4.0.4 --> 4.0.7, i.e. I'm pretty sure it's a generic issue.

Just changed the description as I noticed that #2126 is the 100% identical bug in 3.2, which now also pops up in 4.0rc1.

I also tested xl block-attach and it didn't work and caused the same issues as in #2126.

Contrary to rustybirds statements detaching using qvm-block works in 4.0rc1 though - it's just that nothing appears in domU.

3hhh · Oct 14, 2017

Just changed the description as I noticed that #2126 is the 100% identical bug in 3.2, which now also pops up in 4.0rc1.

I also tested xl block-attach and it didn't work and caused the same issues as in #2126.

Contrary to rustybirds statements detaching using qvm-block works in 4.0rc1 though - it's just that nothing appears in domU.

Ok, did some further testing:

unfortunately systemctl restart xendriverdomain after attaching doesn't fix the issue in domU
sudo journalctl -b0 shows absolutely nothing related in domU
this bug applies to domU AppVMs (I didn't test dispVMs)

3hhh · Oct 14, 2017

Ok, did some further testing:

unfortunately systemctl restart xendriverdomain after attaching doesn't fix the issue in domU
sudo journalctl -b0 shows absolutely nothing related in domU
this bug applies to domU AppVMs (I didn't test dispVMs)

P.S.: I tested with the debian-8 template VM.

3hhh · Oct 14, 2017

P.S.: I tested with the debian-8 template VM.

Just changed the description as I noticed that #2126 is the 100% identical bug in 3.2, which now also pops up in 4.0rc1.

We generally don't maintain duplicate issues for the same bug in different Qubes versions. I think that, in a case like this, we would usually reopen #2126 as a regression (if that's indeed what happened; if not, then that suggests it's not really a duplicate). Do you see any reason not to do this (in the future, anyway)?

andrewdavidwong · Oct 14, 2017

Just changed the description as I noticed that #2126 is the 100% identical bug in 3.2, which now also pops up in 4.0rc1.

We generally don't maintain duplicate issues for the same bug in different Qubes versions. I think that, in a case like this, we would usually reopen #2126 as a regression (if that's indeed what happened; if not, then that suggests it's not really a duplicate). Do you see any reason not to do this (in the future, anyway)?

Found the problem, it is in xen-libs package, not qubes-core-admin-client.
To confirm, check /var/log/xen/xldevd.log - you'll see something about inability to read script.

marmarek · Oct 17, 2017

Found the problem, it is in xen-libs package, not qubes-core-admin-client.
To confirm, check /var/log/xen/xldevd.log - you'll see something about inability to read script.

@marmarek :

To confirm, check /var/log/xen/xldevd.log - you'll see something about inability to read script.

/var/log/xen/xldevd.log is a 0 bytes file in my AppVM, the archived ones as well. I guess I'll have to wait for the patch to go to the testing repo and check again then.

@andrewdavidwong : The root cause was a different one as the fix didn't work.

3hhh · Oct 18, 2017

@marmarek :

To confirm, check /var/log/xen/xldevd.log - you'll see something about inability to read script.

/var/log/xen/xldevd.log is a 0 bytes file in my AppVM, the archived ones as well. I guess I'll have to wait for the patch to go to the testing repo and check again then.

@andrewdavidwong : The root cause was a different one as the fix didn't work.

Automated announcement from builder-github

The package xen_4.8.2-8+deb8u1 has been pushed to the r4.0 testing repository for the Debian jessie template.
To test this update, first enable the testing repository in /etc/apt/sources.list.d/qubes-*.list by uncommenting the line containing jessie-testing, then use the standard update command:

sudo apt-get update && sudo apt-get dist-upgrade

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qvm-block doesn't work with domU loop devices #3172

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3hhh commented Oct 13, 2017 • edited Edited 1 time 3hhh edited Oct 14, 2017 (most recent)

Qubes OS version (e.g., R3.2):

Steps to reproduce the behavior:

Expected behavior:

Actual behavior:

Related issues:

General notes:

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3hhh commented Oct 13, 2017 •

edited

Edited 1 time

3hhh edited Oct 14, 2017 (most recent)

Qubes OS version (e.g., `R3.2`):

3hhh commented Oct 14, 2017 •

edited

Edited 1 time

3hhh edited Oct 14, 2017 (most recent)

marmarek closed this in `marmarek/qubes-vmm-xen@41604a4` Oct 17, 2017