From: hb at gentoo dot x256 dot org Operating system: Gentoo Linux x86 PHP version: 5.1.2 PHP Bug Type: Dynamic loading Bug description: Symbols in libphp5.so conflict with symbols in libgd.so and cause apache probs
Description: ------------ PHP includes a tweaked GD library. It is not compatible with libgd. The problem is, it uses the same symbols (i.e. function names) as libgd and exports them from its shared object. When I load mod_php and mod_perl into Apache, mod_perl programs using the GD library end up sometimes calling PHP's modified GD routines and sometimes not. This causes Apache children to crash semi-randomly. Since the PHP GD library is not compatible with libgd itself (and because it's likely to be co-existing with a different version of libgd on the system, regardless of tweaks), the symbols (functions and others) should be renamed. Perhaps with a PHP_ prefix. This way there will be no dynamic loading collision and PHP/PERL will be able to co-exist in Apache children without damage. I worked around this by recompiling libPHP with external GD library support. However, it took me several hours to diagnose the exact problem. I have also been bitten by this once before already. I recommend fixing this in PHP4 as well as PHP5. Reproduce code: --------------- This PERL/MASON script crashes every time if libphp5.so is loaded as an Apache module, but works perfectly otherwise: <%INIT> use strict; use GD::Graph::lines; my $tgraph = GD::Graph::lines->new(800, 800); my $tgd = $tgraph->plot([ [ "a" ], [ 0 ] ]); print $tgd->png(); return; </%INIT> Expected result: ---------------- Blank graph. Actual result: -------------- Zero-sized reply. GLIBC memory corruption reported upon free() in error_log. -- Edit bug report at http://bugs.php.net/?id=36208&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=36208&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=36208&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=36208&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=36208&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=36208&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=36208&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=36208&r=needscript Try newer version: http://bugs.php.net/fix.php?id=36208&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=36208&r=support Expected behavior: http://bugs.php.net/fix.php?id=36208&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=36208&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=36208&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=36208&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=36208&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=36208&r=dst IIS Stability: http://bugs.php.net/fix.php?id=36208&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=36208&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=36208&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=36208&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=36208&r=mysqlcfg
