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PHP-FPM uses the fcgi socket to send raw log messages crashing nginx

Posted by Hannes Landeholm 
So basically I have a nginx/php-fpm setup that is basically a standard
install pulled directly from the ubuntu repository. When I just
die("test"); it works fine, the text loads in the web browser and when
I strace nginx I can see that php-fpm seem to be transferring valid
fcgi data. However as soon as I trigger some sort of error/notice/
whatever php-fpm will spew text-log messages into the fcgi-socket
making nginx crash with "502 bad gateway".

Also it might be worth noting that I upgraded to php 5.4 because the
php-fpm in 5.3 would segfault almost instantaneously.

This is an strace example (notice that the error is due to invalid
configuration that is easily fixed but any log/message/error will
trigger the same behavior):

connect(6, {sa_family=AF_FILE, path="/var/run/php-fpm.sock"}, 110) = 0
getsockopt(6, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
writev(6, [{"\1\1\0\1\0\10\0\0\0\1\0\0\0\0\0\0\1\4\0\1\3T\4\0\f
\0QUERY_STRING\16\3REQUEST_METHODGET\f\0CONTENT_TYPE\16\0CONTENT_LENGTH
\17\27SCRIPT_FILENAME/data/www/core/core.php\v\16SCRIPT_NAME/core/
core.php\v\1REQUEST_URI/\f\16DOCUMENT_URI/core/core.php\r
\tDOCUMENT_ROOT/data/www\17\10SERVER_PROTOCOLHTTP/
1.1\21\7GATEWAY_INTERFACECGI/1.1\17\fSERVER_SOFTWAREnginx/0.8.54\v
\tREMOTE_ADDR240.0.0.1\v\5REMOTE_PORT59202\v\vSERVER_ADDR240.0.0.194\v
\2SERVER_PORT80\v\0SERVER_NAME\17\3REDIRECT_STATUS200\toPHP_VALUE
\n display_errors On\n display_startup_errors On
\n "..., 896}], 1) = 896
epoll_wait(8, {{EPOLLIN|EPOLLOUT, {u32=748565025,
u64=139707444769313}}}, 512, 60000) = 1
gettimeofday({1334092529, 17977}, NULL) = 0
recvfrom(6, "ERROR: Passing INI directive through FastCGI: empty value
for key 'display_errors On'\nERROR: Passing INI directive through
FastCGI: empty value for key 'display_startup_errors On'\nERROR:
Passing INI directive through FastCGI: empty value for key
'error_reporting 30719'\n", 4096, 0, NULL, NULL) = 270

Thanks for your time,
Hannes Landeholm
Re: PHP-FPM uses the fcgi socket to send raw log messages crashing nginx
May 17, 2012 07:25PM
Were you ever able to resolve this issue? My project might be experiencing the same issue.
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