On Fri, Nov 14, 2014 at 6:21 PM, Jonathan Nieder <jrnieder@xxxxxxxxx> wrote:
> Hi,
>
> Mike Blume wrote:
>
>> TTY tests were previously skipped on all Mac OS systems because of a
>> bug where reading from pty master occasionally hung. This bug has since
>> been found not to be reproducible under Mac OS 10.9 and 10.10.1.
>>
>> Therefore, run TTY tests under Mac OS 10.9 (Mavericks) and higher.
>
> *puzzled* Testing on Yosemite with the following script[1]
>
> perl -MIO::Pty -MFile::Copy -e '
> for (my $i = 0;; $i++) {
> my $master = new IO::Pty;
> my $slave = $master->slave;
> if (fork == 0) {
> close $master or die "close: $!";
> open STDOUT, ">&", $slave or die "dup2: $!";
> close $slave or die "close: $!";
> exec("echo", "hi", $i) or die "exec: $!";
> }
> close $slave or die "close: $!";
> copy($master, \*STDOUT) or die "copy: $!";
> close $master or die "close: $!";
> wait;
> }
> '
>
> still seems to hang eventually (after 61 iterations when my officemate
> tried it), reproducing the bug.
>
> Do you get a different result?
Interesting. It took quite a while, but it did finally fail on my
Mavericks box on the 115,140th iteration.
> The bug was originally found in an autobuilder that would run the test
> suite when new versions were pushed to check for regressions. Even if
> the hang only happened 0.1% of the time, that would get the
> autobuilder stuck after a while, which was how the problem got
> noticed.
Eek... that's nasty.
-John
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