Failing autobuilds with a segfault in winbindd

[Volker Lendecke]

On Tue, Oct 17, 2017 at 04:12:33PM +1300, Andrew Bartlett via samba-technical wrote:
> G'Day Volker,
> 
> I've noticed two recent autobuild failures showing a segfault in winbindd.  
> 
> They started only this week (I've checked back to the start of July)
> 
> https://git.samba.org/autobuild.flakey.sn-devel-144/2017-10-12-1238/samba.stderr
> https://git.samba.org/autobuild.flakey.sn-devel-144/2017-10-13-1240/samba.stderr
> https://git.samba.org/autobuild.flakey.sn-devel-144/2017-10-16-2110/samba.stderr
> 
> Giving that the failure is in operating on a netlogon pipe and the
> recent changes that I reviewed for you to the winbind code, 
> I wondered if you would might be able to look into this to see if you
> can work out what is going wrong?

Stared at the code, but I didn't find any code path where we would
leave cli->binding_handle uninitialized. It seems that in all three
instances "h" is 500000000000401, which sounds like a memory
corruption that might come from anywhere. Is there a way we can run
the flaky check (or a private autobuild) with winbind under valgrind? 

Volker

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