Re: [PATCH] tests: Create fifo for test-io-channel-command

["Alex Bennée" <alex.bennee@linaro.org>]

Daniel P. Berrangé <berrange@redhat.com> writes:

> CC'ing Marc-André as original author of the change
>
> On Tue, Oct 25, 2022 at 01:57:23PM +0100, Alex Bennée wrote:
>> 
>> Juan Quintela <quintela@redhat.com> writes:
>> 
>> > Previous commit removed the creation of the fifo.  Without it, I get
>> > random failure during tests with high load, please consider
>> > reintroduce it.
>> >
>> > My guess is that there is a race between the two socats when we leave
>> > them to create the channel, better return to the previous behavior.
>> >
>> > I can't reproduce the problem when I run ./test-io-channel-command
>> > test alone, I need to do the make check.  And any (unrelated) change
>> > can make it dissapear.
>> 
>> I was chasing a similar problem with this test although I don't see it
>> timeout while running (I don't think our unit tests time out). I'm
>> provisionally queuing this to testing/next unless anyone objects.
>
> It won't build on Win32 since that platform lacks mkfifo.
>
> The test normally works since socat will call mknod to create
> the fifo.
>
> I think the problem is that we have a race condition where the
> client socat runs before the server socat, and so won't see the
> fifo. This will be where high load triggers problems.

Ok I shall drop the patch from testing/next - we need a better solution.

-- 
Alex Bennée