The crash is reproducible with the current version:
wesley@qv0:~$ apt policy qemu-system-x86
qemu-system-x86:
Installed: 1:10.1.0+ds-5ubuntu2.4
Candidate: 1:10.1.0+ds-5ubuntu2.4
Version table:
*** 1:10.1.0+ds-5ubuntu2.4 500
500 http://archive.ubuntu.com/ubuntu questing-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu questing-security/main amd64
Packages
100 /var/lib/dpkg/status
1:10.1.0+ds-5ubuntu2 500
500 http://archive.ubuntu.com/ubuntu questing/main amd64 Packages
### Verfication done Questing ###
wesley@qv0:~$ apt policy qemu-system-x86
qemu-system-x86:
Installed: 1:10.1.0+ds-5ubuntu2.5
Candidate: 1:10.1.0+ds-5ubuntu2.5
Version table:
*** 1:10.1.0+ds-5ubuntu2.5 100
100 http://archive.ubuntu.com/ubuntu questing-proposed/main amd64
Packages
100 /var/lib/dpkg/status
1:10.1.0+ds-5ubuntu2.4 500
500 http://archive.ubuntu.com/ubuntu questing-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu questing-security/main amd64
Packages
1:10.1.0+ds-5ubuntu2 500
500 http://archive.ubuntu.com/ubuntu questing/main amd64 Packages
wesley@qv0:~$ ./provision.sh
+ wget
https://cloud-images.ubuntu.com/daily/server/noble/current/noble-server-cloudimg-amd64.img
--2026-03-26 08:56:59--
https://cloud-images.ubuntu.com/daily/server/noble/current/noble-server-cloudimg-amd64.img
Resolving cloud-images.ubuntu.com (cloud-images.ubuntu.com)... 185.125.190.40,
185.125.190.37, 2620:2d:4000:1::17, ...
Connecting to cloud-images.ubuntu.com
(cloud-images.ubuntu.com)|185.125.190.40|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 629987328 (601M) [application/octet-stream]
Saving to: ‘noble-server-cloudimg-amd64.img.1’
noble-server-cloudimg-amd64.img.1
100%[===================================================================>]
600.80M 1.60MB/s in 21s
2026-03-26 08:57:21 (28.4 MB/s) - ‘noble-server-cloudimg-amd64.img.1’
saved [629987328/629987328]
+ sudo cp noble-server-cloudimg-amd64.img /var/lib/libvirt/images/n0-root.qcow2
+ sudo qemu-img create -f qcow2 /var/lib/libvirt/images/n0-blk0.qcow2 10G
Formatting '/var/lib/libvirt/images/n0-blk0.qcow2', fmt=qcow2
cluster_size=65536 extended_l2=off compression_type=zlib size=10737418240
lazy_refcounts=off refcount_bits=16
+ touch network-config
+ touch meta-data
+ touch user-data
+ virt-install -n n0 --description 'Test noble minimal'
--os-variant=ubuntu24.04 --ram=1024 --vcpus=2 --import --disk
path=/var/lib/libvirt/images/n0-root.qcow2,bus=virtio,cache=writethrough,size=10
--disk
path=/var/lib/libvirt/images/n0-blk0.qcow2,bus=virtio,cache=writethrough,size=10
--graphics none --network network=default --cloud-init
user-data=user-data,meta-data=meta-data,network-config=network-config
...
wesley@qv0:~$ virsh list
Id Name State
----------------------
2 n0 running
wesley@qv0:~$ ./blockrebase-crash.sh n0
...
My connection to the testbed died about 5 hours in to the test; it
filled up 10GB with snapshots and didn't crash:
wesley@qv0:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 391M 1.4M 389M 1% /run
efivarfs 256K 44K 208K 18% /sys/firmware/efi/efivars
/dev/sda1 19G 11G 8.3G 55% /
wesley@qv0:~$ virsh list
Id Name State
----------------------
2 n0 running
### Verfication done Questing ###
** Tags removed: verification-needed-questing
** Tags added: verification-done-questing
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2126951
Title:
`block-stream` segfault with concurrent `query-named-block-nodes`
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/2126951/+subscriptions
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