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test-poll: High failure rate on multi-core FreeBSD guest
From: |
Andrea Bolognani |
Subject: |
test-poll: High failure rate on multi-core FreeBSD guest |
Date: |
Mon, 07 May 2018 13:48:10 +0200 |
Hi,
the test-poll test seems to have a very high failure rate on a
multi-core FreeBSD guest:
$ for i in $(seq 1 10000); do
> ./tests/test-poll >/dev/null 2>&1
> echo $?
> done >test-poll.rc
$ grep -c '.*' test-poll.rc
10000
$ grep -c '^0$' test-poll.rc
5
$ grep -c '^1$' test-poll.rc
50
$ grep -c '^2$' test-poll.rc
9945
If I configure the guest to only have a single vCPU rather than
two, then the test succeeds every single time.
Daniel recently had to fix one of libvirt's own test cases[1],
which similarly started failing on FreeBSD as soon as you moved
past one vCPU. Maybe the issue with gnulib's test-poll is related.
Note that libvirt is on d6397dde2e12 at the moment, but updating
to 0d10473be6fb (which is the current master) didn't help.
[1] https://www.redhat.com/archives/libvir-list/2018-May/msg00009.html
--
Andrea Bolognani / Red Hat / Virtualization
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