Public bug reported:
Ubuntu 24.04.3 LTS
libvirt-daemon 10.0.0-2ubuntu8.11
When adding a filesystem to a running VM on the session connection,
libvirtd crashes.
Steps to reproduce:
- Make a VM on the session connection. I believe the details don't
matter. Stop it.
- Set the necessary "memory backing" parameters.
$ virt-xml -c qemu:///session subVmTest1 --edit 1 --memorybacking
access.mode=shared,source.type=memfd
- Start the machine.
$ virsh -c qemu:///session start subVmTest1
- Add a filesystem with virt-xml.
$ virt-xml -c qemu:///session subVmTest1 --update --add-device --filesystem
type=mount,accessmode=passthrough,driver.type=virtiofs,source.dir=/mnt,target.dir=mnt
ERROR Error attempting device hotplug: End of file while reading data:
Input/output error
This will be in the journal:
Jan 22 14:32:37 ubuntu systemd-coredump[2104]: [🡕] Process 1728
(libvirtd) of user 1000 terminated abnormally without generating a
coredump.
- Repeating the attempt fails differently.
$ virt-xml -c qemu:///session subVmTest1 --update --add-device --filesystem
type=mount,accessmode=passthrough,driver.type=virtiofs,source.dir=/mnt,target.dir=mnt
ERROR Error attempting device hotplug: Cannot open log file:
'/home/admin/.cache/libvirt/qemu/log/subVmTest1-fs0-virtiofsd.log': Device or
resource busy
The content of that file is:
[2026-01-22T14:39:20Z WARN virtiofsd] Use of deprecated option format '-o':
Please specify options without it (e.g., '--cache auto' instead of '-o
cache=auto')
[2026-01-22T14:39:20Z WARN virtiofsd::sandbox] Couldn't set the process uid as
root: -1
[2026-01-22T14:39:20Z WARN virtiofsd::sandbox] Couldn't set the process gid as
root: -1
[2026-01-22T14:39:20Z INFO virtiofsd] Waiting for vhost-user socket
connection...
** Affects: qemu (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2138902
Title:
session libvirtd crashes when hot adding filesystems
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