From c3c5eae6ac69d9f7d4618407aa6c8ac5edc2267c Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Tue, 19 Feb 2019 19:59:28 +0000 Subject: [PATCH] migration: Fix cancel state 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 Message-Id: <20190219195928.12289-1-dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Peter Xu Reviewed-by: Juan Quintela --- 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. */