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Re: problem with httpd hang

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
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.

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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