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// Copyright 2026 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 diff
import (
"context"
"errors"
"testing"
"time"
"github.com/google/syzkaller/pkg/manager"
"github.com/google/syzkaller/pkg/report"
"github.com/google/syzkaller/pkg/repro"
_ "github.com/google/syzkaller/prog/test"
"github.com/stretchr/testify/assert"
)
const testTimeout = 15 * time.Second
func TestNeedReproForTitle(t *testing.T) {
for title, skip := range map[string]bool{
"no output from test machine": false,
"SYZFAIL: read failed": false,
"lost connection to test machine": false,
"INFO: rcu detected stall in clone": false,
"WARNING in arch_install_hw_breakpoint": true,
"KASAN: slab-out-of-bounds Write in __bpf_get_stackid": true,
} {
assert.Equal(t, skip, needReproForTitle(title), "title=%q", title)
}
}
func TestDiffBaseCrashInterception(t *testing.T) {
env := newTestEnv(t, nil)
defer env.close()
env.start()
env.base.CrashesCh <- &report.Report{Title: "base_crash"}
select {
case title := <-env.diffCtx.cfg.BaseCrashes:
assert.Equal(t, "base_crash", title)
case <-time.After(testTimeout):
t.Error("expected base crash")
}
}
func TestDiffExternalIgnore(t *testing.T) {
// Config ignores crash -> Patched crash ignored -> No repro.
runReproCalled := false
mockRunRepro := mockReproCallback("important_crash", nil, func() {
runReproCalled = true
})
env := newTestEnv(t, &Config{
IgnoreCrash: func(ctx context.Context, title string) (bool, error) {
if title == "ignored_crash" {
return true, nil
}
return false, nil
},
runRepro: mockRunRepro,
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
env.new.CrashesCh <- &report.Report{Title: "ignored_crash", Report: []byte("log")}
env.waitForStatus("ignored_crash", manager.DiffBugStatusIgnored)
assert.False(t, runReproCalled, "should not repro ignored crash")
env.new.CrashesCh <- &report.Report{Title: "important_crash", Report: []byte("log")}
env.waitForStatus("important_crash", manager.DiffBugStatusVerifying)
}
func TestDiffSuccess(t *testing.T) {
// Patched kernel crashes -> Repro succeeds -> Base kernel does NOT crash -> PatchedOnly reported.
// Mock Runner (Repro on Base).
env := newTestEnv(t, &Config{
runRepro: mockRepro("crash_title", nil),
runner: newMockRunner(func(ctx context.Context, k Kernel, r *repro.Result, fullRepro bool) *reproRunnerResult {
// Simulate successful run on base without crash.
return &reproRunnerResult{
reproReport: r.Report,
repro: r,
crashReport: nil, // No crash on base.
fullRepro: true,
}
}),
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
select {
case bug := <-env.diffCtx.patchedOnly:
assert.Equal(t, "crash_title", bug.Report.Title)
case <-time.After(testTimeout):
t.Fatal("expected patched only report")
}
}
func TestDiffFailNoRepro(t *testing.T) {
// Patched kernel crashes -> Repro fails -> No report.
env := newTestEnv(t, &Config{
runRepro: mockRepro("", errors.New("repro failed")),
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
env.waitForStatus("crash_title", manager.DiffBugStatusCompleted)
}
func TestDiffFailBaseCrash(t *testing.T) {
// Patched kernel crashes -> Repro succeeds -> Base also crashes -> No PatchedOnly report.
env := newTestEnv(t, &Config{
runRepro: mockRepro("crash_title", nil),
runner: newMockRunner(func(ctx context.Context, k Kernel, r *repro.Result, fullRepro bool) *reproRunnerResult {
return &reproRunnerResult{
reproReport: r.Report,
repro: r,
crashReport: &report.Report{Title: "crash_title"}, // Base crashed.
}
}),
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
select {
case <-env.diffCtx.patchedOnly:
t.Fatal("unexpected patched only report")
case <-env.diffCtx.cfg.BaseCrashes: // Should report to BaseCrashes.
// Expected.
case <-time.After(testTimeout):
t.Fatal("expected base crash report")
}
env.waitForStatus("crash_title", manager.DiffBugStatusCompleted)
}
func TestDiffFailBaseCrashEarly(t *testing.T) {
// Base crashes first -> Patched crashes same title -> No reproduction attempt.
runReproCalled := false
mockRunRepro := mockReproCallback("crash_title", nil, func() {
runReproCalled = true
})
env := newTestEnv(t, &Config{
runRepro: mockRunRepro,
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
env.base.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
select {
case <-env.diffCtx.cfg.BaseCrashes:
case <-time.After(testTimeout):
t.Fatal("expected base crash")
}
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
env.waitForStatus("crash_title", manager.DiffBugStatusIgnored)
assert.False(t, runReproCalled, "WaitRepro should not be called")
}
func TestDiffRetryRepro(t *testing.T) {
// Patched kernel crashes -> Repro fails -> Retried until max attempts.
reproCalled := make(chan struct{}, 10)
mockRunRepro := mockReproCallback("", errors.New("repro failed"), func() {
reproCalled <- struct{}{}
})
env := newTestEnv(t, &Config{
runRepro: mockRunRepro,
})
defer env.close()
env.new.FinishCorpusTriage()
env.start()
for i := 0; i <= maxReproAttempts; i++ {
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
select {
case <-reproCalled:
case <-time.After(testTimeout):
t.Fatalf("iteration %d: expected repro", i)
}
env.waitForStatus("crash_title", manager.DiffBugStatusCompleted)
}
// Inject one more crash, which should be ignored.
env.new.CrashesCh <- &report.Report{Title: "crash_title", Report: []byte("log")}
env.waitForStatus("crash_title", manager.DiffBugStatusIgnored)
select {
case <-reproCalled:
t.Fatalf("unexpected repro")
default:
}
}
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