tfork() test hanging in socket_wrapper lock

[Ralph Böhme]

On Mon, Nov 19, 2018 at 07:12:17PM +0100, Andreas Schneider via samba-technical wrote:
>On Monday, 19 November 2018 19:01:18 CET Andrew Bartlett wrote:
>> On Mon, 2018-11-19 at 11:54 +0100, Andreas Schneider wrote:
>> > On Monday, 19 November 2018 03:59:35 CET Andrew Bartlett wrote:
>> > > Today on sn-devel my autobuild hung running the tfork test:
>> > >
>> > > It appears to be waiting forever for a mutex lock.
>> >
>> > Anoop and myself tried to reproduce it, but we couldn't. However helgrind
>> > reports several errors in tfork itself.
>>
>> I should have mentioned, I've left them stuck in case they can be
>> debugged.
>
>I think Ralph already nailed it. It is an issue with SIGCHLD handling in
>tfork.
>
>https://gitlab.com/samba-team/devel/samba/pipelines/37140126
>
>Already looks good.
>
>However we are looking into Thread Sanitizer right now.

looks like Thread Sanitizer doesn't like a few things in Samba as Andreas and I 
discovered. Particularily the combination of threads and fork gives it a hard 
time. :)

-slow

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Ralph Boehme, Samba Team       https://samba.org/
Samba Developer, SerNet GmbH   https://sernet.de/en/samba/
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