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Date: Sat, 17 Dec 2005 15:33:47 +0000
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Subject: Fatal error 'Unable to read from thread kernel pipe' when using mail function
From: stuttle@gmail.com (Stut)

I hope this gets through - the subscription confirmation email seems
to be taking its time to get to me but I can't afford to wait. I would
appreciate it if responses could be CC'd to me to ensure I get them.

I've googled and also asked this question on the php-general list but
have had no responses. Hopefully the gurus on this list will be able
to help.

I've just upgraded the PHP installation on my server to v4.4.1 and
the mail function has stopped working. I created a script that simply
calls the mail function to send a test email ad this is what I get when
I run it...

stut@brian:~$ php test.php
Fatal error 'Unable to read from thread kernel pipe' at line 1100 in
file /usr/src/lib/libc_r/uthread/uthread_kern.c (errno =3D 0)
Abort trap (core dumped)

The email gets sent successfully on the CLI despite crashing. When the
mail function is called from a web page it never gets sent and the
script never finishes.

I've googled for this error and all references I found that related to
PHP basically say that it's due to Apache and PHP being compiled in
different threading modes. This cannot be the case in this instance
since Apache is using the prefork MPM and even if it wasn't it's
happening on the CLI where Apache is not involved.

I've tried rebuilding Apache WITHOUT_THREADS and then rebuilding PHP
but this made no difference.

Any clues people might have as to the cause of this problem would be
gratefully received.

FYI: Environment is FreeBSD 5.2, Apache 2.0 and Postfix.

Cheers.

-Stut