Segmentation fault(11) – Apache2 and libphp5.so on Ubuntu

yoichi — Mon, 29 Nov 2010 15:32:11 +0000

Ubuntu10.04.1LTSでApache2、PHP5.3がうまく動いてくれない。同一バージョンのApache、PHPを依存ライブラリをほぼ同じにしてdebian Lennyで試してみると問題なく動作する。どうにもこうにもならないので後々のためにとりあえず記録だけ残しておく。

1. PROBLEM: Apache2 Segmentation fault(11)

[Sun Nov 28 17:42:48 2010] [notice] Apache/2.2.2 (Unix) PHP/5.3.3 configured -- resuming normal operations
[Sun Nov 28 17:42:48 2010] [notice] child pid 13032 exit signal Segmentation fault (11)
[Sun Nov 28 17:42:49 2010] [notice] child pid 13033 exit signal Segmentation fault (11)
[Sun Nov 28 17:42:52 2010] [notice] child pid 13034 exit signal Segmentation fault (11)
[Sun Nov 28 17:42:56 2010] [notice] child pid 13035 exit signal Segmentation fault (11)

2. Environments

Installations: apache-2.2.2

tar zxf httpd-2.2.2.tar.gz
cd httpd-2.2.2

CC="gcc" OPTIM="-O2" \
./configure \
--prefix=/home/apache-2.2.2 \
--with-layout=Apache \
--enable-rewrite \
--disable-userdir \
--enable-auth_dbm \
--enable-usertrack \
--enable-=so \
--enable-proxy \
--enable-proxy-http \
--enable-proxy-connect \
--enable-speling \
--enable-headers \
--enable-expires \
--enable-setenvif \
--enable-cache \
--enable-disk-cache \
--enable-mem-cache \
--enable-info \
--enable-rule=SHARED_CORE \
--verbose

make
sudo make install
sudo ln -s /home/apache-2.2.2 /home/apache

Installations: PHP-5.3.3

tar zxvf php-5.3.3.tar.gz
cd php-5.3.3
./configure \
--with-apxs2=/home/apache/bin/apxs \
--with-mysql=/home/mysql \
--with-curl=/usr/lib \
--with-zlib \
--enable-mbstring \
--enable-mbregex \

make
sudo make install

Linux distribution Info

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.04.1 LTS
Release: 10.04
Codename: lucid

Apache Info

$ /home/apache/bin/apachectl -V

Server version: Apache/2.2.2
Server built: Apr 4 2010 10:26:51
Server's Module Magic Number: 20051115:2
Server loaded: APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
Architecture: 32-bit
Server MPM: Prefork
threaded: no
forked: yes (variable process count)
Server compiled with....
-D APACHE_MPM_DIR="server/mpm/prefork" <--- サーバは MPM/Prefork
-D APR_HAS_SENDFILE
-D APR_HAS_MMAP
-D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
-D APR_USE_SYSVSEM_SERIALIZE
-D APR_USE_PTHREAD_SERIALIZE
-D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=128
-D HTTPD_ROOT="/home/apache-2.2.2"
-D SUEXEC_BIN="/home/apache-2.2.2/bin/suexec"
-D DEFAULT_PIDLOG="logs/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_LOCKFILE="logs/accept.lock"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"

$ /home/apache/bin/apachectl -M

Loaded Modules:
core_module (static)
authn_file_module (static)
authn_default_module (static)
authz_host_module (static)
authz_groupfile_module (static)
authz_user_module (static)
authz_default_module (static)
auth_basic_module (static)
cache_module (static)
disk_cache_module (static)
mem_cache_module (static)
include_module (static)
filter_module (static)
log_config_module (static)
env_module (static)
expires_module (static)
headers_module (static)
usertrack_module (static)
setenvif_module (static)
proxy_module (static)
proxy_connect_module (static)
proxy_ftp_module (static)
proxy_http_module (static)
proxy_ajp_module (static)
proxy_balancer_module (static)
mpm_prefork_module (static)
http_module (static)
mime_module (static)
status_module (static)
autoindex_module (static)
asis_module (static)
info_module (static)
cgi_module (static)
negotiation_module (static)
dir_module (static)
actions_module (static)
speling_module (static)
alias_module (static)
rewrite_module (static)
so_module (static)
php5_module (shared)
Syntax OK

$ ldd /home/apache/bin/httpd

linux-gate.so.1 => (0x00ed3000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0x006c4000)
libaprutil-1.so.0 => /home/apache-2.2.2/lib/libaprutil-1.so.0 (0x00586000)
libexpat.so.1 => /lib/libexpat.so.1 (0x0087a000)
libapr-1.so.0 => /home/apache-2.2.2/lib/libapr-1.so.0 (0x00f91000)
librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0x0093b000)
libcrypt.so.1 => /lib/tls/i686/cmov/libcrypt.so.1 (0x005ce000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0x00115000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0x00964000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00413000)
/lib/ld-linux.so.2 (0x00d4f000)

PHP Info

$ php -i

phpinfo()
PHP Version => 5.3.3

System => Linux ubuntu-xps 2.6.32-26-generic #47-Ubuntu SMP Wed Nov 17 15:59:05 UTC 2010 i686
Build Date => Nov 28 2010 19:21:06
Configure Command => './configure' '--with-apxs2=/home/apache/bin/apxs' '--with-mysql=/home/mysql' '--with-curl=/usr/lib' '--with-zlib' '--enable-mbstring' '--enable-mbregex'
Server API => Command Line Interface
Virtual Directory Support => disabled
Configuration File (php.ini) Path => /usr/local/lib
Loaded Configuration File => (none)
Scan this dir for additional .ini files => (none)
Additional .ini files parsed => (none)
PHP API => 20090626
PHP Extension => 20090626
Zend Extension => 220090626
Zend Extension Build => API220090626,NTS
PHP Extension Build => API20090626,NTS
Debug Build => no
Thread Safety => disabled
Zend Memory Manager => enabled
Zend Multibyte Support => disabled
IPv6 Support => enabled
Registered PHP Streams => compress.zlib, php, file, glob, data, http, ftp, phar
Registered Stream Socket Transports => tcp, udp, unix, udg
Registered Stream Filters => zlib.*, convert.iconv.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk

This program makes use of the Zend Scripting Language Engine:
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

$ php -m

[PHP Modules]
Core
ctype
curl
date
dom
ereg
fileinfo
filter
hash
iconv
json
libxml
mbstring
mysql
pcre
PDO
pdo_sqlite
Phar
posix
Reflection
session
SimpleXML
SPL
SQLite
sqlite3
standard
tokenizer
xml
xmlreader
xmlwriter
zlib

[Zend Modules]

$ ldd /home/apache/modules/libphp5.so

linux-gate.so.1 => (0x00569000)
libcrypt.so.1 => /lib/tls/i686/cmov/libcrypt.so.1 (0x00110000)
librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0x001f6000)
libmysqlclient.so.16 => /home/mysql-5.1.30/lib/mysql/libmysqlclient.so.16 (0x00356000)
libz.so.1 => /lib/libz.so.1 (0x00142000)
libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0x00157000)
libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0x0017d000)
libnsl.so.1 => /lib/tls/i686/cmov/libnsl.so.1 (0x00181000)
libcurl.so.4 => /usr/lib/libcurl.so.4 (0x00198000)
libxml2.so.2 => /usr/lib/libxml2.so.2 (0x001ff000)
libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00e02000)
libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0x001dd000)
/lib/ld-linux.so.2 (0x00339000)
libidn.so.11 => /usr/lib/libidn.so.11 (0x004ad000)
liblber-2.4.so.2 => /usr/lib/liblber-2.4.so.2 (0x0032a000)
libldap_r-2.4.so.2 => /usr/lib/libldap_r-2.4.so.2 (0x004df000)
libgssapi_krb5.so.2 => /usr/lib/libgssapi_krb5.so.2 (0x00526000)
libssl.so.0.9.8 => /lib/i686/cmov/libssl.so.0.9.8 (0x00f5c000)
libcrypto.so.0.9.8 => /lib/i686/cmov/libcrypto.so.0.9.8 (0x00fa4000)
libresolv.so.2 => /lib/tls/i686/cmov/libresolv.so.2 (0x00555000)
libsasl2.so.2 => /usr/lib/libsasl2.so.2 (0x1ca3d000)
libgnutls.so.26 => /usr/lib/libgnutls.so.26 (0x1eb4b000)
libkrb5.so.3 => /usr/lib/libkrb5.so.3 (0x14a7f000)
libk5crypto.so.3 => /usr/lib/libk5crypto.so.3 (0x19f18000)
libcom_err.so.2 => /lib/libcom_err.so.2 (0x13a74000)
libkrb5support.so.0 => /usr/lib/libkrb5support.so.0 (0x0c97e000)
libkeyutils.so.1 => /lib/libkeyutils.so.1 (0x0d073000)
libtasn1.so.3 => /usr/lib/libtasn1.so.3 (0x0b5c2000)
libgcrypt.so.11 => /lib/libgcrypt.so.11 (0x09524000)
libgpg-error.so.0 => /lib/libgpg-error.so.0 (0x07565000)

3. Debugging Info

$ sudo gdb ./httpd

GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /home/apache-2.2.2/bin/httpd...done.

(gdb) b ap_process_request
Breakpoint 1 at 0x80b2409: file http_request.c, line 252.
(gdb) run -X -d /home/apache
Starting program: /home/apache-2.2.2/bin/httpd -X -d /home/apache
[Thread debugging using libthread_db enabled]

Breakpoint 1, ap_process_request (r=0x831e390) at http_request.c:252
252 if (ap_extended_status)
(gdb) n
235 {
(gdb) n
252 if (ap_extended_status)
(gdb) n
254 access_status = ap_run_quick_handler(r, 0); /* Not a look-up request */
(gdb) n
255 if (access_status == DECLINED) {
(gdb) n
256 access_status = ap_process_request_internal(r);
(gdb) n
257 if (access_status == OK) {
(gdb) n
258 access_status = ap_invoke_handler(r);
(gdb) n

Program received signal SIGSEGV, Segmentation fault.
0x0079b611 in php_handler (r=0x831e390)
at /home/kawasaki/src/php/php-5.3.3/sapi/apache2handler/sapi_apache2.c:550
550 conf = ap_get_module_config(r->per_dir_config, &php5_module);
(gdb) n

(gdb) bt
#0 0x0079b611 in php_handler (r=0x831e390)
at /home/kawasaki/src/php/php-5.3.3/sapi/apache2handler/sapi_apache2.c:550
#1 0x0807aa47 in ap_run_handler (r=0x831e390) at config.c:157
#2 0x0807db31 in ap_invoke_handler (r=0x831e390) at config.c:371
#3 0x080b2578 in ap_process_request (r=0x831e390) at http_request.c:258
#4 0x080af81e in ap_process_http_connection (c=0x8314348) at http_core.c:172
#5 0x080817c7 in ap_run_process_connection (c=0x8314348) at connection.c:43
#6 0x080cf1d4 in child_main (child_num_arg=) at prefork.c:640
#7 0x080cf434 in make_child (s=0x8109f78, slot=0) at prefork.c:680
#8 0x080d01fa in ap_mpm_run (_pconf=0x81010a8, plog=0x814b1d0, s=0x8109f78)
at prefork.c:956
#9 0x0806872f in main (argc=135262496, argv=0x0) at main.c:717

参考: Apache Debugging Guide: Using gdb

落ちている箇所、php_handler (php-5.3.3/sapi/apache2handler/sapi_apache2.c:550)のソースコード

538 static int php_handler(request_rec *r)
539 {
540 php_struct * volatile ctx;
541 void *conf;
542 apr_bucket_brigade * volatile brigade;
543 apr_bucket *bucket;
544 apr_status_t rv;
545 request_rec * volatile parent_req = NULL;
546 TSRMLS_FETCH();
547
548 #define PHPAP_INI_OFF php_apache_ini_dtor(r, parent_req TSRMLS_CC);
549
550 conf = ap_get_module_config(r->per_dir_config, &php5_module);
551
552 /* apply_config() needs r in some cases, so allocate server_context early */
553 ctx = SG(server_context);
554 if (ctx == NULL || (ctx && ctx->request_processed && !strcmp(r->protocol, "INCLUDED"))) {
555 normal:
556 ctx = SG(server_context) = apr_pcalloc(r->pool, sizeof(*ctx));
557 /* register a cleanup so we clear out the SG(server_context)
558 * after each request. Note: We pass in the pointer to the
559 * server_context in case this is handled by a different thread.
560 */
561 apr_pool_cleanup_register(r->pool, (void *)&SG(server_context), php_server_context_cleanup, apr_pool_cleanup_null);
562 ctx->r = r;
563 ctx = NULL; /* May look weird to null it here, but it is to catch the right case in the first_try later on */
564 } else {
565 parent_req = ctx->r;
566 ctx->r = r;
567 }
568 apply_config(conf);

php5 モジュールの設定情報読み込み時にSegmentation fault(11)でApacheがCrashしている。理由がわからない。とりあえず調査はここで止め、Apacheの設定ファイルからはphp5 モジュールのロード設定をはずしている。早まった考えかもしれないがPHPを使うのやめてしまおうかと思っている今日この頃。PHPなんて。。

おわり

追記 2010.12.05

Apache-2.2.2、PHP-5.3.3共にアンインストールして再インストールしたところ問題なく動いてしまった。evidenceを集め、問題を特定する、それしかないと思い込み（だらだらと）調査していたのでとりあえず再インストールしてみる選択肢は頭になかった。結論として、（素人ぽくてアレなんだけど）困ったときは再インストールしろ – ということだ。

Upgraded to Ubuntu 10.04 LTS

yoichi — Thu, 03 Jun 2010 11:24:20 +0000

3月にXPS M1210にUbuntu 9.10を入れたばかりではあるが4月末にUbuntu 10.04 LTSがリリースされて各所でその完成度の高さが謳われていたのでタイミングを見計らってアップグレードしてみた。9.10からは10.04LTSに直接アップグレードが可能。今回はアップデートマネジャーの指示に従いポチポチボタンを押しただけ。 so easy, so goodだよ。

Ubuntu 10.04 LTSリリースノート
 Ubuntu 10.04 LTSへアップグレードを行うには

Ubuntu 9.10 on my Dell XPS M1210

yoichi — Sat, 27 Mar 2010 14:22:48 +0000

Vista on Dell XPS M1210（CeleronM,1GMEM）というサイテーに遅いOSの上でvmwareやcolinuxを通じてLinuxを動かしているとそのあまりの遅さに端末を捨ててしまいたくなる衝動にかられていた。なのでたまにTV見ながら膝上に乗せて遊んであげていたけどその遅さ故に使うことが憚られその存在は忘れがちに。そこで試しに入れてみたUbuntu 9.10。デュアルブートではなく男らしくフルUbuntu。 Hibernateも問題なく動作しているしサクサク動いて快適。よみがえったよXPS M1210。

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