[PATCH] vm : forbid to start a removing vm

[Hogan Wang <hogan.wang@xxxxxxxxxx>]

From: Zhuang Shengen <zhuangshengen@xxxxxxxxxx>

When a vm is doing migration phase confirm, and then start it concurrently,
it will lead to the vm out of libvirtd control.

Cause Analysis:
1. thread1 migrate vm out.
2. thread2 start the migrating vm.
3. thread1 remove vm from domain list after migrate success.
4. thread2 acquired the vm job success and start the vm.
5. cannot find the vm any more by 'virsh list' command. Actually,
   the started vm is not exist in the domain list.

Solution:
Check the vm->removing state before start.


Signed-off-by: Zhuang Shengen <zhuangshengen@xxxxxxxxxx>
Reviewed-by: Hogan Wang <hogan.wang@xxxxxxxxxx>
---
 src/qemu/qemu_driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index d1a3659774..a5dfea94cb 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6637,6 +6637,12 @@ qemuDomainCreateWithFlags(virDomainPtr dom, unsigned int flags)
         goto endjob;
     }
 
+    if (vm->removing) {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("domain is already removing"));
+        goto endjob;
+    }
+
     if (qemuDomainObjStart(dom->conn, driver, vm, flags,
                            QEMU_ASYNC_JOB_START) < 0)
         goto endjob;
-- 
2.23.0