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34 lines
922 B
Go
34 lines
922 B
Go
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// run
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// Copyright 2024 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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var zero int
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var sink any
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func main() {
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var objs [][]*byte
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for i := 10; i < 200; i++ {
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// The objects we're allocating here are pointer-ful. Some will
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// max out their size class, which are the ones we want.
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// We also allocate from small to large, so that the object which
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// maxes out its size class is the last one allocated in that class.
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// This allocation pattern leaves the next object in the class
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// unallocated, which we need to reproduce the bug.
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objs = append(objs, make([]*byte, i))
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}
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sink = objs // force heap allocation
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// Bug will happen as soon as the write barrier turns on.
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for range 10000 {
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sink = make([]*byte, 1024)
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for _, s := range objs {
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s = append(s, make([]*byte, zero)...)
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}
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}
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}
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