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bdrv_mark_request_serialising is writing the overlap_offset and overlap_bytes fields of BdrvTrackedRequest. Take bs->reqs_lock for the whole duration of it, and not just when waiting for serialising requests, so that tracked_request_overlaps does not look at a half-updated request. The new code does not unlock/relock around retries. This is unnecessary because a retry is always preceded by a CoQueue wait, which already releases and reacquires bs->reqs_lock. Reported-by: Peter Lieven <pl@kamp.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1578495356-46219-4-git-send-email-pbonzini@redhat.com Message-Id: <1578495356-46219-4-git-send-email-pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>