Re: problem with httpd hang

[christos%astron.com@localhost (Christos Zoulas)]

In article <20150213150020.GA27253%asim.lip6.fr@localhost>,
Manuel Bouyer  <bouyer%antioche.eu.org@localhost> wrote:
>On Fri, Feb 13, 2015 at 03:48:56PM +0100, Manuel Bouyer wrote:
>> [...]
>> 
>> The ktrace counts 935 writes and only 868 reads (and 868 calls to fork), so
>> the root cause of the issue may be that the master process sends too many
>> '!' to childrens.
>
>reading the code, the master can indeed write more '!' than the number
>of children, if all childrens are busy and take too much time to
>exit.
>That should not be a problem, because then the server would fork
>more childrens until all extra '!' in the pipe have been consumed.
>
>So the problem is really that the kernel doens't accept the character from
>the write side of the pipe, when the read side has consumed one character.

Please write a unit test for that!

christos