pkg/fuzzer: try to triage on different VMs

Distribute triage requests to different VMs.

1 files changed, 48 insertions, 0 deletions

diff --git a/pkg/fuzzer/queue/distributor_test.go b/pkg/fuzzer/queue/distributor_test.go
new file mode 100644
index 000000000..7bbf9c2e7
--- /dev/null
+++ b/pkg/fuzzer/queue/distributor_test.go
@@ -0,0 +1,48 @@
+// Copyright 2024 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package queue
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDistributor(t *testing.T) {
+	q := Plain()
+	dist := Distribute(q)
+
+	req := &Request{}
+	q.Submit(req)
+	assert.Equal(t, req, dist.Next(0))
+
+	q.Submit(req)
+	assert.Equal(t, req, dist.Next(1))
+
+	// Avoid VM 0.
+	req.Avoid = []ExecutorID{{VM: 0}}
+	q.Submit(req)
+	var noReq *Request
+	assert.Equal(t, noReq, dist.Next(0))
+	assert.Equal(t, noReq, dist.Next(0))
+	assert.Equal(t, req, dist.Next(1))
+
+	// If only VM 0 queries requests, it should eventually got it.
+	q.Submit(req)
+	assert.Equal(t, noReq, dist.Next(0))
+	for {
+		got := dist.Next(0)
+		if got == req {
+			break
+		}
+		assert.Equal(t, noReq, got)
+	}
+
+	// If all active VMs are in the avoid set, then they should get
+	// the request immidiatly.
+	assert.Equal(t, noReq, dist.Next(1))
+	req.Avoid = []ExecutorID{{VM: 0}, {VM: 1}}
+	q.Submit(req)
+	assert.Equal(t, req, dist.Next(1))
+}