Date: Mon, 22 Sep 2025 13:13:48 +0200 From: Paul Floyd <paulf2718@gmail.com> To: freebsd-hackers@FreeBSD.org Subject: select(2) regression? Message-ID: <c6f20acb-6548-4be0-a143-d30222ca4429@gmail.com>
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Hi
I'm testing Valgrind to try to get it ready for 15.0-RELEASE. I've
seeing several new issues. Here is the first one.
In one testcase this code
for (i = 0; i < loops; i++) {
if (sleepms > 0 && s->sleep) {
t[s->t].tv_sec = sleepms / 1000;
t[s->t].tv_usec = (sleepms % 1000) * 1000;
ret = select (0, NULL, NULL, NULL, &t[s->t]);
/* We only expect a timeout result or EINTR from the above. */
if (ret != 0 && errno != EINTR)
perror("unexpected result from select");
}
if (burn > 0 && s->burn)
do_burn();
}
is failing with the select call returning 93. I don't see how that is
possible with 0 nfds and empty fd sets. Note that the problem is in vgdb
which is a plain C exe not running under Valgrind. I'll see if I can
make a smaller reproducer. This is on amd64. It looks like a regression
to me - select worked as expected as far as I can remember going back to
FreeBSD 10.
A+
Paul
help
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