Description:
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Summary: If the directory containing error_log is not writeable, Apache gets stuck taking 100% CPU.

Detail:
I recently set log_errors = On in php.ini, and began receiving a TON of "[notice] child pid 15591 exit signal Segmentation fault (11)" in my Apache error_log.  In addition, a ton of "Allowed memory size of 8388608 bytes exhausted (tried to allocate 2 bytes)" began showing up as well.  Even worse, Apache child threads would shoot up to 100% CPU and over time 5-6 threads would all be fighting for that 100%, causing page serve problems.

I come to find out that the directoy that error_log was set to go to was not writeable by the webserver user.  As soon as I make the directory writeable (or turn off log_errors), all problems go away and the server returns to normal operations.

'./configure' '--prefix=/usr/local' '--with-apache=/usr/local/Apachetoolbox-1.5.66/apache_1.3.27' '--enable-exif' '--enable-track-vars' '--with-calendar=shared' '--enable-magic-quotes' '--enable-trans-sid' '--enable-wddx' '--enable-ftp' '--enable-inline-optimization' '--enable-memory-limit' '--with-gd=/usr/local' '--with-zlib' '--enable-gd-native-tt' '--with-t1lib=/usr/local' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--with-zlib-dir=/usr' '--with-ttf' '--with-freetype-dir=/usr/local' '--with-imap=/usr/sbin' '--with-openssl=/usr' '--with-gd' '--with-zlib-dir=/usr' '--with-png-dir=/usr' '--with-jpeg-dir=/usr' '--with-mysql' '--with-ldap' '--with-kerberos=/usr/kerberos'

Reproduce code:
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1) Enable log_errors in php.ini
2) Set error_log to a directory not writeable by the webuser.
3) Create some php errors that you would expect to be logged into error_log.
4) Send a lot of traffic to the server, watch your Apache's error_log and watch Apache threads shoot up to 100% CPU.

Expected result:
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If error_log cannot be written, abort instead of taking down Apache.

Actual result:
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[notice] child pid 15591 exit signal Segmentation fault (11)

Allowed memory size of 8388608 bytes exhausted (tried to allocate 2 bytes)