apache crashes on startup: Mar 19 09:47:13 localhost kernel: apache2[12326]: segfault at f ip 00007fa7a38b6d96 sp 00007fff4df05580 error 6 in libpthread-2.15.so[7fa7a38ac000+18000] Mar 19 09:55:10 localhost kernel: apache2[26025]: segfault at f ip 00007f194adf1d96 sp 00007fff01c7ae20 error 6 in libpthread-2.15.so[7f194ade7000+18000] This happens if apc.shm_size = 512M is added to /etc/php/apache2-php5.3/php.ini The default value of 32MB allows it to work # emerge -pv pecl-apc php apache These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] www-servers/apache-2.2.24:2 USE="ssl -debug -doc -ldap (-selinux) -static -suexec -threads" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias -asis -auth_digest -authn_dbd -cern_meta -charset_lite -dbd -dumpio -ident -imagemap -log_forensic -proxy -proxy_ajp -proxy_balancer -proxy_connect -proxy_ftp -proxy_http -proxy_scgi -reqtimeout -substitute -version" APACHE2_MPMS="-event -itk -peruser -prefork -worker" 0 kB [ebuild R ~] dev-lang/php-5.3.23-r1:5.3::x-overlay USE="apache2 berkdb bzip2 cli crypt ctype curl fileinfo filter gd gdbm hash iconv ipv6 json mysql nls phar posix readline session simplexml ssl tokenizer unicode xml zlib -bcmath -calendar -cdb -cgi -cjk -curlwrappers -debug -doc -embed -enchant -exif -firebird -flatfile -fpm (-frontbase) -ftp -gmp -imap -inifile -intl -iodbc -kerberos -ldap -ldap-sasl -libedit -mhash -mssql -mysqli -mysqlnd -oci8-instant-client -odbc -pcntl -pdo -postgres -qdbm -recode (-selinux) -sharedmem -snmp -soap -sockets -spell -sqlite -sqlite2 (-sybase-ct) -sysvipc -threads -tidy -truetype -wddx -xmlreader -xmlrpc -xmlwriter -xpm -xsl -zip" 0 kB [ebuild R ] dev-php/pecl-apc-3.1.9-r2 USE="lock_pthreadmutex -lock_pthreadrw -lock_semaphore -lock_spinlock -mmap" PHP_TARGETS="php5-3" 0 kB Portage 2.1.11.52 (default/linux/amd64/13.0, gcc-4.6.3, glibc-2.15-r3, 3.7.10-gentoo x86_64) ================================================================= System uname: Linux-3.7.10-gentoo-x86_64-QEMU_Virtual_CPU_version_1.2.2-with-gentoo-2.1 KiB Mem: 4056916 total, 957676 free KiB Swap: 0 total, 0 free Timestamp of tree: Mon, 18 Mar 2013 00:45:01 +0000 ld GNU ld (GNU Binutils) 2.22 app-shells/bash: 4.2_p37 dev-lang/python: 2.7.3-r2, 3.2.3 dev-util/cmake: 2.8.9 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.1-r1 sys-apps/openrc: 0.11.8 sys-apps/sandbox: 2.5 sys-devel/autoconf: 2.69 sys-devel/automake: 1.10.3, 1.11.6 sys-devel/binutils: 2.22-r1 sys-devel/gcc: 4.6.3 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.6 (virtual/os-headers) sys-libs/glibc: 2.15-r3 Repositories: gentoo x-overlay ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.4/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LDFLAGS="-Wl,-O1 -Wl,--as-needed" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/overlay" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="acl amd64 apache2 berkdb bindist bzip2 cli cracklib crypt curl cxx dri fortran gd gdbm gpm iconv ipv6 mmx modules mudflap multilib mysql ncurses nls nptl openmp pam pcre readline session sse sse2 ssl tcpd unicode zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" RUBY_TARGETS="ruby18 ruby19" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, MAKEOPTS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
3.1.13 (~arch version) has the same braindamage. Setting to any value above 32MB causes a segfault.
APC related bugs are a bit over my abilities to fix, but generally, I have more luck with making apc behave when using file-backed mmap. Compile apc with mmap enabled and set something like apc.mmap_file_mask=/tmp/apc.XXXXXX
That "fixes" it, thanks for the pointer. Still bad that it doesn't care about errors and kills apache :\
Have you modified kernel.shmmax? By default, it is set to 32MB. I have successfully raised the APC cache size to 256MB after setting up shmmax properly. Be aware that APC 3.1.13 , PHP 5.4 (fpm) and Apache 2.4.4 don't work nice together. We have observed lot's of segfaults. The (temporary) solution was to build APC from trunk. We are looking forward replacing APC with memcache+zendopcache.
Package removed
