[Qemu-devel] [PATCH] migration: Fix cancel state

["Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>]

From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

During a cancelled migration there's a race where the fd can
go into an error state before we get back around the migration loop
and migration_detect_error transitions from cancelling->failed.

Check for cancelled/cancelling and don't change the state.

Red Hat bug: https://bugzilla.redhat.com/show_bug.cgi?id=1608649

Fixes: b23c2ade250
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/migration.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index c39d3054ec..e44f77af02 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -2911,6 +2911,13 @@ static MigThrError postcopy_pause(MigrationState *s)
 static MigThrError migration_detect_error(MigrationState *s)
 {
     int ret;
+    int state = s->state;
+
+    if (state == MIGRATION_STATUS_CANCELLING ||
+        state == MIGRATION_STATUS_CANCELLED) {
+        /* End the migration, but don't set the state to failed */
+        return MIG_THR_ERR_FATAL;
+    }
 
     /* Try to detect any file errors */
     ret = qemu_file_get_error(s->to_dst_file);
@@ -2920,7 +2927,7 @@ static MigThrError migration_detect_error(MigrationState *s)
         return MIG_THR_ERR_NONE;
     }
 
-    if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) {
+    if (state == MIGRATION_STATUS_POSTCOPY_ACTIVE && ret == -EIO) {
         /*
          * For postcopy, we allow the network to be down for a
          * while. After that, it can be continued by a
@@ -2932,7 +2939,7 @@ static MigThrError migration_detect_error(MigrationState *s)
          * For precopy (or postcopy with error outside IO), we fail
          * with no time.
          */
-        migrate_set_state(&s->state, s->state, MIGRATION_STATUS_FAILED);
+        migrate_set_state(&s->state, state, MIGRATION_STATUS_FAILED);
         trace_migration_thread_file_err();
 
         /* Time to stop the migration, now. */
-- 
2.20.1