pkg/fuzzer/queue: retry inputs from crashed VMs

Mark some requests as Important. The Retry() layer will give them one
more chance even if they were not executed due to a VM crash.

For now, the only important requests are related to triage, candidates
and pkg/vminfo tests.

Add tests for retry.go.

1 files changed, 6 insertions, 0 deletions

diff --git a/pkg/fuzzer/queue/retry.go b/pkg/fuzzer/queue/retry.go
index 0b2e02ba5..c59a2c048 100644
--- a/pkg/fuzzer/queue/retry.go
+++ b/pkg/fuzzer/queue/retry.go
@@ -33,5 +33,11 @@ func (r *retryer) done(req *Request, res *Result) bool {
 		r.pq.Submit(req)
 		return false
 	}
+	// Retry important requests from crashed VMs once.
+	if res.Status == Crashed && req.Important && !req.onceCrashed {
+		req.onceCrashed = true
+		r.pq.Submit(req)
+		return false
+	}
 	return true
 }