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test: disable udp_reuseport test under qemu (#5002)

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The test is multi-threaded and expects both threads to receive at least
some of the incoming datagrams but there isn't always true parallelism
under QEMU's user-mode emulator.

Single-core systems are also susceptible to that so also add a check
that we have at least two cores to run on.

It's not perfect because a sufficiently dedicated test torturer could
probably concoct a containerized setup where the core count > 1 but the
available CPU slice is so small that the test effectively still runs
sequentially, but it's better than nothing.

Fixes: https://github.com/libuv/libuv/issues/4777
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Ben Noordhuis 2026-01-21 22:34:30 +01:00 committed by GitHub
parent 4cb6a2d33c
commit 0405e1224f
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test/test-udp-reuseport.c
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@ -215,6 +215,17 @@ TEST_IMPL(udp_reuseport) {
int r; int r;
int i; int i;
#if defined(__QEMU__)
/* QEMU's user-mode emulator sometimes runs threads in sequence
* instead of in parallel and that throws off the test.
* See https://github.com/libuv/libuv/issues/4777.
*/
RETURN_SKIP("Unreliable under QEMU");
#endif /* defined(__QEMU__) */
if (uv_available_parallelism() < 2)
RETURN_SKIP("Unreliable without thread parallelism");
r = uv_mutex_init(&mutex); r = uv_mutex_init(&mutex);
ASSERT_OK(r); ASSERT_OK(r);