Your message dated Thu, 13 Aug 2026 20:50:50 +0000
with message-id <[email protected]>
and subject line Bug#1144050: fixed in rust-virtiofsd 1.14.0-3
has caused the Debian Bug report #1144050,
regarding virtiofsd: Fails to mount with "vhost_backend_init failed: Protocol
error"
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1144050: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1144050
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: virtiofsd
Version: 1.14.0-2
Severity: important
Dear Maintainer,
After upgrading from 1.14.0-1 which works fine, to 1.14.0-2, I can now
not mount any virtiofs shares on Sid (tried on 2 different Trixie guests).
Error from virt-manager:
Error starting domain: internal error: QEMU unexpectedly closed the monitor
(vm='debian13'): 2026-08-11T10:15:39.842604Z qemu-system-x86_64: -device
{"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-
fs0","tag":"kernel","bus":"pci.2","addr":"0x0"}: Failed to read msg header.
Read 0 instead of 12. Original request 0.
2026-08-11T10:15:39.842685Z qemu-system-x86_64: -device
{"driver":"vhost-user-
fs-pci","id":"fs0","chardev":"chr-vu-
fs0","tag":"kernel","bus":"pci.2","addr":"0x0"}: vhost_backend_init failed:
Protocol error
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 67, in
cb_wrapper
callback(asyncjob, *args, **kwargs)
~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 101, in
tmpcb
callback(*args, **kwargs)
~~~~~~~~^^^^^^^^^^^^^^^^^
File "/usr/share/virt-manager/virtManager/object/libvirtobject.py",
line 57,
in newfn
ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/object/domain.py", line
1446, in
startup
self._backend.create()
~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib/python3/dist-packages/libvirt.py", line 1401, in create
raise libvirtError('virDomainCreate() failed')
libvirt.libvirtError: internal error: QEMU unexpectedly closed the monitor
(vm='debian13'): 2026-08-11T10:15:39.842604Z qemu-system-x86_64: -device
{"driver":"vhost-user-fs-pci","id":"fs0","chardev":"chr-vu-
fs0","tag":"kernel","bus":"pci.2","addr":"0x0"}: Failed to read msg header.
Read 0 instead of 12. Original request 0.
2026-08-11T10:15:39.842685Z qemu-system-x86_64: -device
{"driver":"vhost-user-
fs-pci","id":"fs0","chardev":"chr-vu-
fs0","tag":"kernel","bus":"pci.2","addr":"0x0"}: vhost_backend_init failed:
Protocol error
Or on the CLI:
$ virsh attach-device debian13 virtiofs-kernel.xml --live
error: Failed to attach device from virtiofs-kernel.xml
error: internal error: unable to execute QEMU command 'device_add':
vhost_backend_init failed: Protocol error
Here's my virtiofs-kernel.xml:
<filesystem type="mount" accessmode="passthrough">
<driver type="virtiofs"/>
<binary path="/usr/libexec/virtiofsd"/>
<idmap>
<uid start="502" target="502" count="1"/>
<gid start="502" target="502" count="1"/>
</idmap>
<source dir="/home/simon/kernel"/>
<target dir="kernel"/>
</filesystem>
I've not changed anything else and downgrading to 1.14.0-1 works fine again.
-- System Information:
Debian Release: forky/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 7.1.7+deb14-amd64 (SMP w/32 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages virtiofsd depends on:
ii libc6 2.43-3
ii libcap-ng0 0.9.3-1+b1
ii libgcc-s1 16.2.0-1
ii libseccomp2 2.6.1-1
ii uidmap 1:4.19.3-2
virtiofsd recommends no packages.
virtiofsd suggests no packages.
-- no debconf information
--
Simon John
--- End Message ---
--- Begin Message ---
Source: rust-virtiofsd
Source-Version: 1.14.0-3
Done: Fabian Grünbichler <[email protected]>
We believe that the bug you reported is fixed in the latest version of
rust-virtiofsd, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Fabian Grünbichler <[email protected]> (supplier of updated
rust-virtiofsd package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Thu, 13 Aug 2026 22:39:31 +0200
Source: rust-virtiofsd
Architecture: source
Version: 1.14.0-3
Distribution: unstable
Urgency: medium
Maintainer: Debian Rust Maintainers
<[email protected]>
Changed-By: Fabian Grünbichler <[email protected]>
Closes: 1144050
Changes:
rust-virtiofsd (1.14.0-3) unstable; urgency=medium
.
* Package virtiofsd 1.14.0 from crates.io using debcargo 2.8.4
* Update seccomp filter to match vhost 0.17 (Closes: #1144050)
* Update mkosi autopkgtest to pick up unsigned systemd-boot efi files
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