Along with using q35 these jobs are also using accel=tcg ([libvirt]virt_type=qemu) and might be seeing increased memory pressure during tempest runs due to https://bugs.launchpad.net/nova/+bug/1949606 (QEMU >= 5.0.0 with -accel tcg uses a tb-size of 1GB causing OOM issues in CI) . Others have already ruled that out as an underlying cause here but I think we should keep it in mind here especially when combined with q35.
Along with using q35 these jobs are also using accel=tcg ([libvirt] virt_type= qemu) and might be seeing increased memory pressure during tempest runs due to https:/ /bugs.launchpad .net/nova/ +bug/1949606 (QEMU >= 5.0.0 with -accel tcg uses a tb-size of 1GB causing OOM issues in CI) . Others have already ruled that out as an underlying cause here but I think we should keep it in mind here especially when combined with q35.