Re: failed to load seccomp syscall filter in kernel: Operation canceled

On 10/25/22 02:38, Jiatong Shen wrote: > Hello community, > > I am operating an openstack cluster where applications (libvirt/nova > etc) are running using containers. The compute node's arch is aarch64 > (phytium 2500), when there are virtual machines around 60 or 70, I > failed to boot new virtual machines and faced with following error message, > > error: internal error: qemu unexpectedly closed the monitor: > 2022-10-24T06:23:54.545685Z qemu-system-aarch64: -sandbox > on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny: > failed to load seccomp syscall filter in kernel: Operation canceled > This error message comes from qemu, which sees seccomp_load() fail. Looking further [1], seccomp_load() returns -ECANCELED. This is because qemu does not set SCMP_FLTATR_API_SYSRAWRC attribute and thus public APIs fail with this meaningless error. I've posted patch here [1]. But the symptoms suggest that you are hitting a limit (for eBPF perhaps?). 1: https://lists.gnu.org/archive/html/qemu-devel/2022-10/msg04509.html > > Interestingly, if I virsh stop one virtual machine, I am able to boot > another. Besides, I managed to manually boot a virtual machine without > any issue. So my question is what could be the potential cause of this > behavior and how can I deal with it? Thank you very much in advance for > the help. > I wonder whether the fact that openstack runs VMs in container has something to do with this. Perhaps it touches the limit/sets different accounting for it? Michal