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runtime/race: runaway memory consumption #14533

dvyukov opened this issue Feb 26, 2016 · 1 comment

runtime/race: runaway memory consumption #14533

dvyukov opened this issue Feb 26, 2016 · 1 comment


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dvyukov commented Feb 26, 2016

The following benchmark consumes unlimited amount of memory:

func BenchmarkSyncLeak(b *testing.B) {
    const (
        G = 1000
        S = 1000
        H = 10
    var wg sync.WaitGroup
    for g := 0; g < G; g++ {
        go func() {
            defer wg.Done()
            hold := make([][]uint32, H)
            for i := 0; i < b.N; i++ {
                a := make([]uint32, S)
                atomic.AddUint32(&a[rand.Intn(len(a))], 1)
                hold[rand.Intn(len(hold))] = a
            _ = hold

The main cause is that race runtime does not wipe stale synchronization objects from heap memory blocks.

@dvyukov dvyukov self-assigned this Feb 26, 2016
@dvyukov dvyukov added this to the Go1.7 milestone Feb 26, 2016
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CL mentions this issue.

@golang golang locked and limited conversation to collaborators May 3, 2017
@rsc rsc unassigned dvyukov Jun 23, 2022
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