libvirt segfaults with "internal,error: Missing monitor reply object", during block live-migration
Dear libvirt community, Using recent Ubuntu Stein Cloud Packages, we are observing random libvirtd live-migration crashes on the target host. Libvirt is having a SEGFAULT with the qemu driver. Transferring block devices usually works without issues. However, the following memory transfer is causing the target libvirtd randomly to close down its socket, resulting in a roll-backed migration process.I can reproduce this with large VMs, which have a large memory pool. The last error message we see in libvirt logs is: error : qemuMonitorJSONCommandWithFd:315 : internal error: Missing monitor reply object With this, libvirt segfaults and restarts. Before we encountered this issue, we used an older nova-compute package (19.0.3). Not sure if this made a difference with usage of libvirtd-api. After upgrade, we also see a lot of recurring errors during migration: warning : qemuDomainObjBeginJobInternal:7044 : Cannot start job (query, none, none) for domain instance-00008f56; current job is (none, none, migration in) owned by (0 <null>, 0 <null>, 0 remoteDispatchDomainMigratePrepare3Params (flags=0x809b)) for (0s, 0s, 14834s) error : qemuDomainObjBeginJobInternal:7066 : Timed out during operation: cannot acquire state change lock (held by monitor=remoteDispatchDomainMigratePrepare3Params) They don't abort the running migration process, but spam every minute to the systemd journal. Source and destination run the same packages: Ubuntu 18.04.4 LTS (GNU/Linux 4.15.0-99-generic x86_64) OpenStack Stein (Ubuntu Cloud Archive) Libvirt+QEMU_x86 keystone-common 2:15.0.1-0ubuntu1~cloud0 libvirt-daemon 5.0.0-1ubuntu2.6~cloud0 qemu-system-x86 1:3.1+dfsg-2ubuntu3.7~cloud0 neutron-linuxbridge-agent 2:14.2.0-0ubuntu1~cloud0 neutron-plugin-ml2 2:14.2.0-0ubuntu1~cloud0 nova-compute 2:19.2.0-0ubuntu1~cloud0 nova-compute-libvirt 2:19.2.0-0ubuntu1~cloud0 I have attached source/destination debug logs from libvirtd and nova-compute here: https://denzelx.ddns.net/index.php/s/KPJ7vv4aTcb69XD Any help would be nice! Best Regards -- M.Sc Alex Walender de.NBI Cloud Bielefeld Administrator Center for Biotechnology (CeBiTec) University of Bielefeld 33594 Bielefeld Germany room: M3-118 phone: +49 (521) 106 2907
On Thu, Jul 30, 2020 at 16:13:09 +0200, Alex Walender wrote:
Dear libvirt community,
Using recent Ubuntu Stein Cloud Packages, we are observing random libvirtd live-migration crashes on the target host. Libvirt is having a SEGFAULT with the qemu driver. Transferring block devices usually works without issues. However, the following memory transfer is causing the target libvirtd randomly to close down its socket, resulting in a roll-backed migration process.I can reproduce this with large VMs, which have a large memory pool.
Could you please also attach the backtrace of the libvirtd process once it crashes? That would be helpful.
Hi Peter, I have attached a trace via coredump. Best Regards Am 30.07.20 um 17:03 schrieb Peter Krempa:
On Thu, Jul 30, 2020 at 16:13:09 +0200, Alex Walender wrote:
Dear libvirt community,
Using recent Ubuntu Stein Cloud Packages, we are observing random libvirtd live-migration crashes on the target host. Libvirt is having a SEGFAULT with the qemu driver. Transferring block devices usually works without issues. However, the following memory transfer is causing the target libvirtd randomly to close down its socket, resulting in a roll-backed migration process.I can reproduce this with large VMs, which have a large memory pool. Could you please also attach the backtrace of the libvirtd process once it crashes? That would be helpful.
-- M.Sc Alex Walender de.NBI Cloud Bielefeld Administrator Center for Biotechnology (CeBiTec) University of Bielefeld 33594 Bielefeld Germany room: M3-118 phone: +49 (521) 106 2907
participants (3)
-
Alex Walender -
Michal Privoznik -
Peter Krempa