[Samba] [PATCH] Do not close winbind socket during use

[Stefan (metze) Metzmacher]

Am 09.07.2013 17:33, schrieb Stefan (metze) Metzmacher:
> Hi Andrew,
> 
> Am 03.07.2013 09:44, schrieb Andrew Bartlett:
>> On Thu, 2013-06-27 at 11:42 +1000, Andrew Bartlett wrote:
>>> On Wed, 2013-06-26 at 20:39 +1000, Andrew Bartlett wrote:
>>>> On Mon, 2013-06-24 at 15:26 +0000, Philippe.Simonet at swisscom.com wrote:
>>>>> Hi Andrew, and by putting more num-callers : 
>>>>>
>>>>> valgrind --num-callers=50 samba -i -M single
>>>>
>>>> Thanks for getting me that.  I've managed to reproduce it here, but not
>>>> under valgrind, and only when I hack the code to force a timeout.  At
>>>> least this should help me figure out why we process the winbind socket
>>>> close, which is the crux of this issue.
>>>
>>> I think I've found the cause of the issue you are hitting.  There is
>>> still another issue with the nested event loop in the krb5 libs, but
>>> these two patches should help significantly.
>>>
>>> As you have had more luck than I in reproducing this in a unaltered
>>> setting, please let me know if this helps.
>>>
>>> Patches are for git master, but may apply to 4.0 as well.
>>
>> G'Day,
>>
>> The original reporter has confirmed to me that this removes the segfault
>> for him.  It changes it to a 105 sec hang, (due to the winbind client
>> trying for 5 second at at a time many times). 
>>
>> Can I get a review on it so we can rid master and eventually 4.0 of this
>> nasty crash?
> 
> I've looked through this patches and have some improvements.
> The main problem is that we're not sure wbsrv_call_loop() is called again
> on the terminated connection, when the last pending request is finished.
> That's why I remember all broken connections and try to clean them up
> before accepting a new connection or processing any new request on any
> connection.
> This way we're sure the connection gets removed eventually.
> 
> I'm currently running some autobuild with the attached patches,
> they might also fix the current flakey crashes, e.g.
> https://git.samba.org/autobuild.flakey/2013-07-08-0055/samba.stderr

Here's the next try, which hopefully don't crash in make test :-)

metze
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