I got to the bottom of it. It turns out not to be a race condition at
all, but rather a case of uninitialized array on the stack. The stack
layout changed a bit in our glibc version.
The fix was simply to initialize the array. It has been posted in a PR
upstream, as well as in a Debian bug (even though they're not affected,
presumably because they don't have the same compilation flags).
In any case, not glibc's fault :)
** Changed in: glibc (Ubuntu)
Status: New => Invalid
** Changed in: gap-guava (Ubuntu)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/2077414
Title:
gap-guava autopkgtests fail on amd64 with glibc 2.40
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