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[2007-03-19 13:17 UTC] pbugs at ausschlafen dot com
Description: ------------ Hi, I tried to upgrade APC and php together. What I have is php 4.4.6 and APC 3.0.13, running under Apache 1.3.37. I took a sample of all unique GET URLs of my live site and replayed them on the test server, so the test is not run in a high load environment. Nevertheless, sooner or later during the replay, apache childs crash with : [notice] child pid 30366 exit signal Bus error (7) As long as the APC console is working, it does not show any problem; no fragmentation and the memory usage is not more than 50% of the 64 MB I assigned to APC. After the errors occur, the server is unstable. Static files can be served, but the APC console (and most - but not all- other php apps and scripts) don't work any more. The crashes do not always occur at the same step of the URL replay; in this respect I can not pinpoint a single script or application. However, multiple test runs repeatedly failed sooner or later. Apache has to be restarted then. Occasionally I see [apc-error] Cannot redeclare classes in the Apache error log when some wordpress blogs are accessed. The PHP error log remains empty (E_ALL), however. These happen to appear shortly before the "Bus errors", but I don't know whether there is a connection to the crash or not. My APC settings: configured with ./configure --enable-apc --enable-apc-mmap --with-apxs=... php.ini: extension="apc.so" apc.enabled=1 apc.shm_segments=1 apc.optimization=0 apc.shm_size=64 apc.ttl=7600 apc.user_ttl=3600 apc.gc_ttl=3600 apc.num_files_hint=1500 apc.user_entries_hint=100 apc.mmap_file_mask=/mnt/ramdisk/apc13.XXXXXX apc.enable_cli=0 ;apc.cache_by_default=Off apc.filters="-/some/useless/path/" ; DEPRECATED now write_lock apc.slam_defense=20 apc.file_update_protection=5 apc.max_file_size=1M apc.stat=1 apc.write_lock=1 The user cache is not used at all. PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Well, I was able to produce a backtrace in part; I had to transfer the core (including all the source and compile tree) to a remote machine . Hopfully sheds some light on the problem. This GDB was configured as "i386-linux"...(no debugging symbols found)... Core was generated by `/usr/local/apache-beta/bin/httpd'. Program terminated with signal 7, Bus error. Error while mapping shared library sections: /lib/libz.so.1: No such file or directory. Error while mapping shared library sections: /opt/pcre//lib/libpcre.so.0: No such file or directory. Reading symbols from /lib/libm.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/libm.so.6 Reading symbols from /lib/libcrypt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libcrypt.so.1 Reading symbols from /usr/lib/libgdbm.so.2...(no debugging symbols found)... done. Loaded symbols for /usr/lib/libgdbm.so.2 Reading symbols from /usr/lib/libexpat.so.0...(no debugging symbols found)... done. Loaded symbols for /usr/lib/libexpat.so.0 Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/ld-linux.so.2 Reading symbols from /lib/libnsl.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/libnsl.so.1 Reading symbols from /lib/libnss_compat.so.2...(no debugging symbols found)... done. Loaded symbols for /lib/libnss_compat.so.2 Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)... done. Loaded symbols for /lib/libpthread.so.0 ---Type <return> to continue, or q <return> to quit--- Reading symbols from /usr/local/apache-beta/libexec/libphp4.so... (no debugging symbols found)...done. Loaded symbols for /usr/local/apache-beta/libexec/libphp4.so Error while reading shared library symbols: /lib/libz.so.1: No such file or directory. Error while reading shared library symbols: /opt/pcre//lib/libpcre.so.0: No such file or directory. Reading symbols from /lib/libresolv.so.2...(no debugging symbols found)...done. Loaded symbols for /lib/libresolv.so.2 Reading symbols from /usr/local/apache-beta/php4/lib/php/extensions/no-debug-non -zts-20020429/apc.so...done. Loaded symbols for /usr/local/apache-beta/php4/lib/php/extensions/no-debug-non-z ts-20020429/apc.so Reading symbols from /lib/librt.so.1...done. Loaded symbols for /lib/librt.so.1 #0 sma_allocate (shmaddr=0x40423000, size=84) at /usr/local/src/APC-3.0.13/apc_sma.c:155 155 if (cur->size == realsize || (cur->size > (sizeof(block_t) + rea lsize))) { (gdb) (gdb) bt full #0 sma_allocate (shmaddr=0x40423000, size=84) at /usr/local/src/APC-3.0.13/apc_sma.c:155 size = 1110151204 prv = (block_t *) 0x40423010 cur = (block_t *) 0x422b9024 prvnextfit = (block_t *) 0x0 realsize = 104 last_offset = 0 wrapped = 0 #1 0x403f63a9 in apc_sma_malloc (n=84) at /usr/local/src/APC-3.0.13/apc_sma.c:404 off = 1078079504 i = 1077896704 #2 0x403f31ac in apc_copy_op_array (dst=0x0, src=0x814a64c, allocate=0x403f6350 <apc_sma_malloc>, deallocate=0x403f6600 <apc_sma_free>) at /usr/local/src/APC-3.0.13/apc_compile.c:1102 i = 1077896704 local_dst_alloc = 0 #3 0x403f4f39 in my_compile_file (h=0xbfff0c78, type=2) at /usr/local/src/APC-3.0.13/apc_main.c:408 key = {data = {file = {device = 2052, inode = 4992943}, user = { identifier = 0x804 <Address 0x804 out of bounds>, identifier_len = 0}, fpfile = {fullpath = 0x804 <Address 0x804 out of bounds>, ---Type <return> to continue, or q <return> to quit--- fullpath_len = 0}}, mtime = 1173710679, type = 1 '\001'} cache_entry = (apc_cache_entry_t *) 0x0 op_array = (zend_op_array *) 0x814a64c num_functions = 693 num_classes = 3 ret = 1077896704 alloc_op_array = (zend_op_array *) 0xbfff0c50 alloc_functions = (apc_function_t *) 0x402ceb20 alloc_classes = (apc_class_t *) 0x403f6350 t = 1174329496 path = 0x0 mem_size = 0 #4 0x402b7d72 in compile_filename () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #5 0x402e2300 in execute () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #6 0x402cb788 in zend_execute_scripts () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #7 0x402a403a in php_execute_script () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. ---Type <return> to continue, or q <return> to quit--- #8 0x402e422a in apache_php_module_main () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #9 0x402e4ce3 in apache_php_module_main () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #10 0x402e4d36 in apache_php_module_main () from /usr/local/apache-beta/libexec/libphp4.so No symbol table info available. #11 0x08070679 in ap_invoke_handler () No symbol table info available. #12 0x08087452 in ap_run_sub_req () No symbol table info available. #13 0x0805594b in ap_get_server_built () No symbol table info available. #14 0x08058c8c in ap_get_server_built () No symbol table info available. #15 0x080592f6 in ap_get_server_built () No symbol table info available. #16 0x08070679 in ap_invoke_handler () No symbol table info available. #17 0x08087e9c in ap_some_auth_required () No symbol table info available. ---Type <return> to continue, or q <return> to quit--- #18 0x08088350 in ap_internal_redirect () No symbol table info available. #19 0x0805cb5c in ap_get_server_built () No symbol table info available. #20 0x08070679 in ap_invoke_handler () No symbol table info available. #21 0x08087e9c in ap_some_auth_required () No symbol table info available. #22 0x08087f12 in ap_process_request () No symbol table info available. #23 0x0807dfe0 in ap_child_terminate () No symbol table info available. #24 0x0807e25a in ap_child_terminate () No symbol table info available. #25 0x0807e608 in ap_child_terminate () No symbol table info available. #26 0x0807ec7c in ap_child_terminate () No symbol table info available. #27 0x0807f2cc in main () No symbol table info available. #28 0x400b57ee in iconv_close () from /lib/libc.so.6 No symbol table info available.This shouldn't be happening, but still apply this patch and try again. --- apc_main.c 15 Mar 2007 22:11:55 -0000 3.95 +++ apc_main.c 20 Mar 2007 11:58:09 -0000 @@ -191,7 +191,11 @@ #endif if (status == FAILURE) { - apc_eprint("Cannot redeclare class %s", cl.name); + //apc_eprint("Cannot redeclare class %s", cl.name); + apc_eprint("Cannot redeclare class '%s%s'", + (cl.name[0] == 0 && cl.name_len != 0) ? "\0" : "", + (cl.name[0] == 0 && cl.name_len != 0) ? &(cl.name[1]) : cl.name + ); } return status; } or you could put an assert(0); instead of the printf and get a coredump from the abort handler, a back trace of that should be able to tell you what the file was. (if you want some help with gdb'ing, I'm g0pz on #php.pecl on EFnet)Hi again, I changed the error message with your patch, it now is: [apc-error] Cannot redeclare class '\0cachemeta/path/to/blog/wp-content/wp-cache-config.php25' The whole WP installation has only one class definition for CacheMeta. This is checked for with class_exists. Look here: cd pathtoblog grep -irn cachemeta * | grep -v /cache/wp-cache wp-content/advanced-cache.php: 32: $meta = new CacheMeta; wp-content/plugins/wp-cache/wp-cache-phase1.php: 32: $meta = new CacheMeta; wp-content/plugins/wp-cache/wp-cache-phase2.php: 39: $wp_cache_meta_object = new CacheMeta; wp-content/plugins/wp-cache/wp-cache-phase2.php: 285: $meta = new CacheMeta; // THIS SAMPlE FILE IS NEVER EXECUTED/INCLUDED: wp-content/plugins/wp-cache/wp-cache-config-sample.php: 24:if (!class_exists('CacheMeta')) { 25: class CacheMeta { wp-content/plugins/wp-cache/wp-cache.php: 554: $meta = new CacheMeta; wp-content/wp-cache-config.php: 24:if (!class_exists('CacheMeta')) { 25: class CacheMeta { Inside the cache, there are files with serialized objects/classes, here is one sample: wp-content/cache/wp-cache-9ff82df024f86e4f87d956eb12327694.meta:1:O:9:"cachemeta ":5:{s:7:"dynamic";b:0;s:7:"headers";a:3:{i:0;s:43:"Content-Type: text/html; charset=iso-8859-1";i:1;s:54:"X-Pingback: http://www.XXXXX.de/XXXXX/xmlrpc.ph p";i:2;s:44:"Last-Modified: Tue, 20 Mar 2007 11:49:15 GMT";}s:3:"uri";s:64:"www. XXXXX.de/XXXXX/2005/10/31/title-string-here/";s:4:"post";s:2:"14 ";s:7:"blog_id";i:1;} These are the includes and requires of the cache plugin, a mix of include, reqire and include_once. # egrep -ir "include|require" wp-content/plugins/wp-cache/ wp-content/plugins/wp-cache/wp-cache-phase1.php: if( !@include(ABSPATH . 'wp-content/wp-cache-config.php') ) { wp-content/plugins/wp-cache/wp-cache-phase1.php: include($cache_file); wp-content/plugins/wp-cache/wp-cache-phase1.php: require(ABSPATH . 'wp-content/plugins/wp-cache/wp-cache-phase2.php'); wp-content/plugins/wp-cache/wp-cache-phase2.php: "<!--mclude-->\n<?php include_once('" . ABSPATH . "$1'); ?>\n<!--/mclude-->", $buffer); wp-content/plugins/wp-cache/wp-cache.php: if( !@include($wp_cache_config_file) ) { @include($wp_cache_config_file_sample); wp-content/plugins/wp-cache/wp-cache.php: require($wp_cache_config_file); Is this still an APC issue or not? All I can say is that this blog works without APC ... Regards, UlrichYou're on php4, right ? Go to apc_main.c function install_class. - #ifdef ZEND_ENGINE_2 /* Special case for mangled names. Mangled names are unique to a file. * There is no way two classes with the same mangled name will occur, * unless a file is included twice. And if in case, a file is included * twice, all mangled name conflicts can be ignored and the class redeclaration * error may be deferred till runtime of the corresponding DECLARE_CLASS * calls. */ if(cl.name_len != 0 && cl.name[0] == '\0') { if(zend_hash_exists(CG(class_table), cl.name, cl.name_len+1)) { return SUCCESS; } }'\0cachemeta/path + #ifdef ZEND_ENGINE_2 I guess php4 has mangled named classes as the '\0cachemeta/path...' showed.Fix is confirmed for a simple c.php if(!class_exists('X')) { class X {}; } included multiple times. http://news.php.net/php.pecl.cvs/7503 Read http://t3.dotgnu.info/blog/php/inclusion-checks.html to understand how exactly APC behaves when it runs into such checks - and why include_once lends itself better for optimisations (more on that in the next releases' INSTALL)