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Ran 20 Jul 2023 01:18PM UTC

Files 348

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Committed 19 Jul 2023 07:36PM UTC coverage: 87.705% (+0.6%) from 87.064%

Job # #37588.1

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push

local

Committed by

web-flow

Commit Message

Fix memory corruption if task is launched inside finalizer (#50597)

In #48919, the tid selection logic inside `enq_task` gained a
`!GC.in_finalizer()` condition. However, this made it possible for
`workqueue_at` to be reached with `tid==0`, which would attempt and
out-of-bounds write under `@inbounds`, corrupting memory. This was not
caught in the test suite despite `--check-bounds=yes`, because our
`--check-bounds=yes` is currently best effort. That would be fixed by
#50239, which exposed this bug. This PR attempts to
fix this by marking any tasks launched inside a finalizer as not sticky.
Finalizers don't have any thread they run on
semantically, so i don't think there's a meaningful sense in which tasks
launched inside finalizers could be sticky.

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