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
On Tue, Feb 19, 2019 at 07:59:28PM +0000, Dr. David Alan Gilbert (git) wrote: > 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> Reviewed-by: Peter Xu <peterx@redhat.com> Thanks, -- Peter Xu
* Dr. David Alan Gilbert (git) (dgilbert@redhat.com) wrote: > 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> Queued > --- > 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 > > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
"Dr. David Alan Gilbert (git)" <dgilbert@redhat.com> wrote: > 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> Reviewed-by: Juan Quintela <quintela@redhat.com>
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