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runtime: index out of range error with doublecheck enabled in heapBitsSetType on 386 #40335

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martisch opened this issue Jul 21, 2020 · 1 comment
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runtime: index out of range error with doublecheck enabled in heapBitsSetType on 386 #40335

martisch opened this issue Jul 21, 2020 · 1 comment
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.
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Go1.16

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@martisch
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martisch commented Jul 21, 2020 •
edited

go tip with GOOS=linux and GOARCH=386 bootstrapping from go1.4 fails with an index out of range error at:

go/src/runtime/mbitmap.go

Line 1415 in 11f92e9

end.bitp = addb(&mheap_.arenas[endAI.l1()][endAI.l2()].bitmap[0], heapArenaBitmapBytes)

when doublecheck is set to true:

go/src/runtime/mbitmap.go

Line 912 in 11f92e9

const doubleCheck = false // slow but helpful; enable to test modifications to this code

I dont believe this is specific to the bootstrap process but this is the way I can trigger it reliably on different linux machines.

cc @aclements @mknyszek
@martisch martisch added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Jul 21, 2020
@martisch martisch added this to the Go1.16 milestone Jul 21, 2020
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Change https://golang.org/cl/244538 mentions this issue: runtime: simplify heapBitsSetType doubleCheck

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