This patch is just revert of [1]. Actually we should NOT pass QEMU_ASYNC_JOB_NONE as that patch suggests while we are in async job in order to acquire nested jobs correctly. The patch tries to fix issues introduced by another patch [2] where jobs are mistakenly cleared out in qemuProcessStop. Later patch [3] fixed the issue introduced by patch [2]. Now we need to revert [1] as well as we now still have same concurrency crash issues as [3] described but for the force revert. [1] 0c4408c83: qemu: Don't use asyncJob after stop during snapshot revert [2] 888aa4b6b: qemuDomainObjPrivateDataClear: Don't leak @migParams [3] d75f865fb: qemu: fix concurrency crash bug in snapshot revert Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy(a)virtuozzo.com&gt; --- src/qemu/qemu_snapshot.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/src/qemu/qemu_snapshot.c b/src/qemu/qemu_snapshot.c index 1e8ea80..5f49fd1 100644 --- a/src/qemu/qemu_snapshot.c +++ b/src/qemu/qemu_snapshot.c @@ -1719,7 +1719,6 @@ qemuSnapshotRevert(virDomainObjPtr vm, qemuDomainSaveCookiePtr cookie; virCPUDefPtr origCPU = NULL; unsigned int start_flags = VIR_QEMU_PROCESS_START_GEN_VMID; - qemuDomainAsyncJob jobType = QEMU_ASYNC_JOB_START; bool defined = false; virCheckFlags(VIR_DOMAIN_SNAPSHOT_REVERT_RUNNING | @@ -1899,9 +1898,6 @@ qemuSnapshotRevert(virDomainObjPtr vm, VIR_DOMAIN_EVENT_STOPPED, detail); virObjectEventStateQueue(driver->domainEventState, event); - /* Start after stop won't be an async start job, so - * reset to none */ - jobType = QEMU_ASYNC_JOB_NONE; goto load; } } @@ -1968,7 +1964,7 @@ qemuSnapshotRevert(virDomainObjPtr vm, rc = qemuProcessStart(snapshot->domain->conn, driver, vm, cookie ? cookie->cpu : NULL, - jobType, NULL, -1, NULL, snap, + QEMU_ASYNC_JOB_START, NULL, -1, NULL, snap, VIR_NETDEV_VPORT_PROFILE_OP_CREATE, start_flags); virDomainAuditStart(vm, "from-snapshot", rc >= 0); @@ -2003,7 +1999,7 @@ qemuSnapshotRevert(virDomainObjPtr vm, } rc = qemuProcessStartCPUs(driver, vm, VIR_DOMAIN_RUNNING_FROM_SNAPSHOT, - jobType); + QEMU_ASYNC_JOB_START); if (rc < 0) goto endjob; virObjectUnref(event); -- 1.8.3.1