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// 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 manager
import (
"context"
"sync/atomic"
"testing"
"time"
"github.com/google/syzkaller/pkg/report"
"github.com/stretchr/testify/assert"
)
func TestReproManager(t *testing.T) {
mock := &reproMgrMock{
run: make(chan runCallback),
}
obj := NewReproLoop(mock, 3, false)
// No reproductions until we've started.
assert.False(t, obj.CanReproMore())
ctx, done := context.WithCancel(context.Background())
complete := make(chan struct{})
go func() {
obj.Loop(ctx)
close(complete)
}()
defer func() {
done()
<-complete
}()
obj.Enqueue(&Crash{Report: &report.Report{Title: "A"}})
called := <-mock.run
assert.Equal(t, "A", called.crash.Title)
// One reproducer is running -- we can take one more.
assert.True(t, obj.CanReproMore())
assert.EqualValues(t, 2, mock.reserved.Load())
obj.Enqueue(&Crash{Report: &report.Report{Title: "B"}})
called2 := <-mock.run
assert.Equal(t, "B", called2.crash.Title)
assert.False(t, obj.CanReproMore())
assert.Len(t, obj.Reproducing(), 2)
assert.EqualValues(t, 3, mock.reserved.Load())
// Pretend that reproducers have finished.
called.ret <- &ReproResult{Crash: &Crash{FromHub: true}}
called2.ret <- &ReproResult{Crash: &Crash{FromHub: true}}
mock.onVMShutdown(t, obj)
}
func TestReproOrder(t *testing.T) {
mock := &reproMgrMock{
run: make(chan runCallback),
}
obj := NewReproLoop(mock, 1, false)
// The right order is A B C.
crashes := []*Crash{
{
Report: &report.Report{Title: "A"},
FromDashboard: true,
Manual: true,
},
{
Report: &report.Report{Title: "B"},
FromDashboard: true,
},
{
Report: &report.Report{Title: "C"},
FromHub: true,
},
}
obj.Enqueue(crashes[2])
obj.Enqueue(crashes[1])
obj.Enqueue(crashes[0])
obj.Enqueue(crashes[1])
obj.Enqueue(crashes[0])
obj.Enqueue(crashes[2])
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go obj.Loop(ctx)
for i := 0; i < len(crashes)*2; i++ {
called := <-mock.run
assert.Equal(t, crashes[i%len(crashes)], called.crash)
called.ret <- &ReproResult{}
}
}
func TestReproRWRace(t *testing.T) {
mock := &reproMgrMock{
run: make(chan runCallback),
}
obj := NewReproLoop(mock, 3, false)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go obj.Loop(ctx) // calls runRepro()
obj.Enqueue(&Crash{Report: &report.Report{Title: "A"}})
obj.Enqueue(&Crash{Report: &report.Report{Title: "A"}})
assert.True(t, mock.NeedRepro(nil))
called := <-mock.run
// Pretend that processRepro() is finished and
// we've written "repro.prog" to the disk.
mock.reproProgExist.Store(true)
assert.False(t, mock.NeedRepro(nil))
called.ret <- &ReproResult{}
assert.True(t, obj.CanReproMore())
// The second repro process will never be started.
mock.onVMShutdown(t, obj)
}
type reproMgrMock struct {
reserved atomic.Int64
run chan runCallback
reproProgExist atomic.Bool
}
type runCallback struct {
crash *Crash
ret chan *ReproResult
}
// Wait until the number of reserved VMs goes to 0.
func (m *reproMgrMock) onVMShutdown(t *testing.T, reproLoop *ReproLoop) {
for i := 0; i < 100; i++ {
if m.reserved.Load() == 0 {
assert.True(t, reproLoop.CanReproMore())
assert.True(t, reproLoop.Empty())
return
}
time.Sleep(10 * time.Millisecond)
}
t.Fatal("reserved VMs must have dropped to 0")
}
func (m *reproMgrMock) RunRepro(crash *Crash) *ReproResult {
retCh := make(chan *ReproResult)
m.run <- runCallback{crash: crash, ret: retCh}
ret := <-retCh
close(retCh)
return ret
}
func (m *reproMgrMock) NeedRepro(crash *Crash) bool {
return !m.reproProgExist.Load()
}
func (m *reproMgrMock) ResizeReproPool(VMs int) {
m.reserved.Store(int64(VMs))
}
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