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[libc] SCHED_FIFO and SCHED_RR tests fail on Arch Linux #95564

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overmighty opened this issue Jun 14, 2024 · 1 comment · Fixed by #95562
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[libc] SCHED_FIFO and SCHED_RR tests fail on Arch Linux #95564

overmighty opened this issue Jun 14, 2024 · 1 comment · Fixed by #95562
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libc test-suite

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These tests fail on Arch Linux, where setting these scheduling policies succeeds even when not running as root.

See #95562.
@github-actions github-actions bot added the libc label Jun 14, 2024
@overmighty overmighty mentioned this issue Jun 14, 2024
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@overmighty
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It turns out that this is not inherently related to Arch Linux, but to usage of the realtime-privileges package and running the test as a user part of the realtime group, which allows the user to set real-time scheduling policies.

AlexisPerry pushed a commit to llvm-project-tlp/llvm-project that referenced this issue Jul 9, 2024
@overmighty @AlexisPerry
[libc] Fix scheduler test incorrectly guessing user privileges (llvm#…
adebd76 
…95562)

Non-root users may be able to set real-time scheduling policies. Don't
expect failure to set real-time scheduling policies based on UID.
Instead, check that if it fails, it is either due to missing privileges,
or unsupported parameters if the scheduling policy is not mandated by
POSIX.

Fixes llvm#95564.
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[libc] Fix scheduler test incorrectly guessing user privileges overmighty/llvm-project
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@EugeneZelenko @overmighty