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runtime: lock ordering problem between sweep and mspanSpecial #42472

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bcmills opened this issue Nov 10, 2020 · 2 comments
Closed

runtime: lock ordering problem between sweep and mspanSpecial #42472

bcmills opened this issue Nov 10, 2020 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker
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Go1.16

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@bcmills
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bcmills commented Nov 10, 2020 

0 : sweep 7 0x663320
1 : mspanSpecial 22 0x7fd5af0f7418
fatal error: lock ordering problem

2020-11-09T19:46:24-a2d0147/linux-amd64-staticlockranking
2020-10-31T08:31:08-12a2e72/linux-amd64-staticlockranking
2020-10-23T20:53:14-d1b1145/linux-amd64-staticlockranking

CC @danscales @mknyszek
@bcmills bcmills added NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. release-blocker labels Nov 10, 2020
@bcmills bcmills added this to the Go1.16 milestone Nov 10, 2020
@mknyszek
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This is a missing partial edge. It's definitely a correct ordering: this is the background sweeper queuing a finalizer or handling a memory profile sample.

@mknyszek mknyszek self-assigned this Nov 10, 2020
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Change https://golang.org/cl/268857 mentions this issue: runtime: add lock rank partial order edge sweep -> mspanSpecial

@golang golang locked and limited conversation to collaborators Nov 10, 2021
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