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panic when encountering an illegal cpumask in thread::available_parallelism #115946

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Merged
merged 1 commit into from
Sep 19, 2023
Merged

panic when encountering an illegal cpumask in thread::available_parallelism #115946

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6 changes: 4 additions & 2 deletions library/std/src/sys/unix/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -324,8 +324,10 @@ pub fn available_parallelism() -> io::Result<NonZeroUsize> {
if libc::sched_getaffinity(0, mem::size_of::<libc::cpu_set_t>(), &mut set) == 0 {
let count = libc::CPU_COUNT(&set) as usize;
let count = count.min(quota);
// SAFETY: affinity mask can't be empty and the quota gets clamped to a minimum of 1
return Ok(NonZeroUsize::new_unchecked(count));
// reported to occur on MIPS kernels older than our minimum supported kernel version for those targets
let count = NonZeroUsize::new(count)
.expect("CPU count must be > 0. This may be a bug in sched_getaffinity(); try upgrading the kernel.");
return Ok(count);
}
}
}
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