Similar to bug #339976, running "emerge glibc" on amd64 causes the emerge process to consume 100% CPU doing polling. Interestingly, it reverts to normal halfway into compilation (likely at the point when it's done with the x86 abi and starts compiling glibc for the amd64 abi). Sorry, I couldn't figure out how to use pdb to find out the poll events flags, but this is what's revealed by strace (the following line is repeated many times per second): poll([{fd=3, events=POLLIN|POLLERR|POLLHUP|POLLNVAL}, {fd=6, events=POLLIN|POLLERR|POLLHUP|POLLNVAL}], 2, 3000) = 1 ([{fd=3, revents=POLLHUP}]) Reproducible: Always Steps to Reproduce: 1. emerge glibc 2. wait until compilation starts 3. Observe abnormally high cpu consumption by the emerge process in top Actual Results: emerge's CPU usage is 100% Expected Results: CPU usage should be very low $ emerge --info Portage 2.2.0_alpha84 (default/linux/amd64/10.0, gcc-4.5.2, unavailable, 2.6.38.2 x86_64) ================================================================= System uname: Linux-2.6.38.2-x86_64-Intel-R-_Pentium-R-_D_CPU_3.40GHz-with-gentoo-2.0.1 Timestamp of tree: Thu, 02 Feb 2012 08:45:01 +0000 distcc 3.0 x86_64-pc-linux-gnu [disabled] app-shells/bash: 4.1_p2 dev-java/java-config: 2.1.10 dev-lang/python: 2.5.4-r3, 2.6.4 dev-util/cmake: 2.8.1-r2 dev-util/pkgconfig: 0.23 sys-apps/baselayout: 2.0.1 sys-apps/openrc: 0.4.3-r3 sys-apps/sandbox: 2.2 sys-devel/autoconf: 2.13, 2.63-r1 sys-devel/automake: 1.6.3-r1, 1.9.6-r2, 1.10.2, 1.11.1 sys-devel/binutils: 2.22-r1 sys-devel/gcc: 4.4.5, 4.5.2 sys-devel/gcc-config: 1.4.0-r4 sys-devel/libtool: 2.2.6b sys-devel/make: 3.81-r2 sys-kernel/linux-headers: 2.6.38 (virtual/os-headers) sys-libs/glibc: 2.14.1-r2 Repositories: gentoo location: /mnt/portage/portage sync: rsync://mirror.yandex.ru/gentoo-portage priority: -1000 lcd-filtering location: /var/lib/layman/lcd-filtering masters: gentoo priority: 0 local location: /mnt/portage/local masters: gentoo priority: 1 Installed sets: @system ABI="amd64" ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA dlj-1.1 AdobeFlash-10.1 skype-eula" ACCEPT_PROPERTIES="*" ALSA_CARDS="hda-intel" 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" ANT_HOME="/usr/share/ant" 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" ARCH="amd64" AUTOCLEAN="yes" BOOTSTRAP_USE="cxx unicode multilib" CALLIGRA_FEATURES="kexi words flow plan stage tables krita karbon braindump" CAMERAS="ptp2" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -g -pipe -march=native" CFLAGS_amd64="-m64" CFLAGS_x32="-mx32" CFLAGS_x86="-m32" CHOST="x86_64-pc-linux-gnu" CHOST_amd64="x86_64-pc-linux-gnu" CHOST_x32="x86_64-pc-linux-gnu" CHOST_x86="i686-pc-linux-gnu" CLEAN_DELAY="5" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" COLLISION_IGNORE="/lib/modules" COLORFGBG="15;0" COLORTERM="rxvt" CONFIG_PROTECT="/etc /usr/share/openvpn/easy-rsa" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c /etc/udev/rules.d" CVS_RSH="ssh" CXXFLAGS="-O2 -g -pipe -march=native" DCCC_PATH="/usr/lib64/distcc/bin" DEFAULT_ABI="amd64" DISPLAY=":0.0" DISTCC_LOG="" DISTCC_VERBOSE="0" DISTDIR="/usr/distfiles" EDITOR="vim" ELIBC="glibc" EMERGE_DEFAULT_OPTS="-avt" EMERGE_WARNING_DELAY="10" EPREFIX="" EROOT="/" FCFLAGS="" FEATURES="assume-digests binpkg-logs distlocks ebuild-locks fixlafiles news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv" FETCHCOMMAND="wget -t 3 -T 60 --passive-ftp -O "${DISTDIR}/${FILE}" "${URI}"" FETCHCOMMAND_RSYNC="rsync -avP "${URI}" "${DISTDIR}/${FILE}"" FETCHCOMMAND_SFTP="bash -c "x=\${2#sftp://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec sftp -P \${port} \"\${host}:/\${x#*/}\" \"\$1\"" sftp "${DISTDIR}/${FILE}" "${URI}"" FETCHCOMMAND_SSH="bash -c "x=\${2#ssh://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec rsync --rsh=\"ssh -p\${port}\" -avP \"\${host}:/\${x#*/}\" \"\$1\"" rsync "${DISTDIR}/${FILE}" "${URI}"" FFLAGS="" FLTK_DOCDIR="/usr/share/doc/fltk-1.1.7-r3/html" GCC_SPECS="" GDK_USE_XFT="1" GENTOO_MIRRORS=" http://mirror.yandex.ru/gentoo-distfiles " 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" GRUB_PLATFORMS="" HG="/usr/bin/hg" HISTCONTROL="ignoredups" HISTFILESIZE="100000" HISTSIZE="100000" HOME="/home/monoid" HUSHLOGIN="FALSE" HZ="100" INFOPATH="/usr/share/info:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.22/info:/usr/share/gcc-data/x86_64-pc-linux-gnu/4.5.2/info" INPUT_DEVICES="keyboard mouse" JAVAC="/etc/java-config-2/current-system-vm/bin/javac" JAVA_HOME="/etc/java-config-2/current-system-vm" JDK_HOME="/etc/java-config-2/current-system-vm" KERNEL="linux" LANG="en_US.UTF-8" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LC_ALL="" LC_NUMERIC="C" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,--hash-style=both" LDFLAGS_amd64="-m elf_x86_64" LDFLAGS_x32="-m elf32_x86_64" LDFLAGS_x86="-m elf_i386" LESS="-R -M --shift 5" LESSOPEN="|lesspipe.sh %s" LIBDIR_amd64="lib64" LIBDIR_amd64_fbsd="lib64" LIBDIR_n32="lib32" LIBDIR_n64="lib64" LIBDIR_o32="lib" LIBDIR_ppc="lib32" LIBDIR_ppc64="lib64" LIBDIR_s390="lib32" LIBDIR_s390x="lib64" LIBDIR_sparc32="lib32" LIBDIR_sparc64="lib64" LIBDIR_x32="libx32" LIBDIR_x86="lib32" LIBDIR_x86_fbsd="lib32" LINGUAS="en ru" LOGNAME="monoid" LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.pdf=00;32:*.ps=00;32:*.txt=00;32:*.patch=00;32:*.diff=00;32:*.log=00;32:*.tex=00;32:*.doc=00;32:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:" MAKEOPTS="-j2 -l2" MANPAGER="vimmanpager" MANPATH="/etc/java-config-2/current-system-vm/man:/usr/local/share/man:/usr/share/man:/usr/share/binutils-data/x86_64-pc-linux-gnu/2.22/man:/usr/share/gcc-data/x86_64-pc-linux-gnu/4.5.2/man:/etc/java-config/system-vm/man/:/opt/intel/mkl/10.0.5.025/man:/usr/qt/3/doc/man:/opt/cuda/man" MKLROOT="/opt/intel/mkl/10.0.5.025" MULTILIB_ABIS="amd64 x86" MULTILIB_STRICT_DENY="64-bit.*shared object" MULTILIB_STRICT_DIRS="/lib32 /lib /usr/lib32 /usr/lib /usr/kde/*/lib32 /usr/kde/*/lib /usr/qt/*/lib32 /usr/qt/*/lib /usr/X11R6/lib32 /usr/X11R6/lib" MULTILIB_STRICT_EXEMPT="(perl5|gcc|gcc-lib|binutils|eclipse-3|debug|portage|udev)" NETBEANS="apisupport cnd groovy gsf harness ide identity j2ee java mobility nb php profiler soa visualweb webcommon websvccommon xml" OOO_FORCE_DESKTOP="gnome" OPENGL_PROFILE="nvidia" PAGER="vimpager" PATH="/home/monoid/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.5.2:/opt/ibm/systemsim-cell/bin:/usr/qt/3/bin:/usr/games/bin:/opt/cuda/computeprof/bin:/opt/cuda/bin" PHP_TARGETS="php5-3" PKGDIR="/usr/packages" PKG_CONFIG_PATH="/usr/qt/3/lib64/pkgconfig" PORTAGE_ARCHLIST="ppc sparc64-freebsd ppc-openbsd x86-openbsd ppc64 x86-winnt x86-fbsd ppc-aix alpha arm x86-freebsd s390 amd64 arm-linux x86-macos x64-openbsd ia64-hpux hppa x86-netbsd x86-cygwin amd64-linux ia64-linux x86 sparc-solaris x64-freebsd sparc64-solaris x86-linux x64-macos sparc m68k-mint ia64 mips ppc-macos x86-interix hppa-hpux amd64-fbsd x64-solaris m68k sh x86-solaris sparc-fbsd" PORTAGE_BINHOST_CHUNKSIZE="3000" PORTAGE_BIN_PATH="/usr/lib64/portage/bin" PORTAGE_COMPRESS_EXCLUDE_SUFFIXES="css gif htm[l]? jp[e]?g js pdf png" PORTAGE_CONFIGROOT="/" PORTAGE_DEBUG="0" PORTAGE_DEPCACHEDIR="/var/cache/edb/dep" PORTAGE_ELOG_CLASSES="warn error log" PORTAGE_ELOG_MAILFROM="portage@localhost" PORTAGE_ELOG_MAILSUBJECT="[portage] ebuild log for ${PACKAGE} on ${HOST}" PORTAGE_ELOG_MAILURI="root" PORTAGE_ELOG_SYSTEM="save_summary echo" PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS="5" PORTAGE_FETCH_RESUME_MIN_SIZE="350K" PORTAGE_GID="250" PORTAGE_GPG_SIGNING_COMMAND="gpg --sign --clearsign --yes --default-key "${PORTAGE_GPG_KEY}" --homedir "${PORTAGE_GPG_DIR}" "${FILE}"" PORTAGE_INST_GID="0" PORTAGE_INST_UID="0" PORTAGE_NICENESS="3" PORTAGE_OVERRIDE_EPREFIX="" PORTAGE_PYM_PATH="/usr/lib64/portage/pym" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_RSYNC_RETRIES="-1" PORTAGE_SYNC_STALE="30" PORTAGE_TMPDIR="/var/tmp" PORTAGE_TMPFS="/dev/shm" PORTAGE_VERBOSE="1" PORTAGE_WORKDIR_MODE="0700" PORTDIR="/mnt/portage/portage" PORTDIR_OVERLAY="/var/lib/layman/lcd-filtering /mnt/portage/local" PORT_LOGDIR_CLEAN="find "${PORT_LOGDIR}" -type f ! -name "summary.log*" -mtime +7 -delete" PRELINK_PATH_MASK="/usr/lib64/libfreebl3.so:/usr/lib64/libnssdbm3.so:/usr/lib64/libsoftokn3.so" PROFILE_ONLY_VARIABLES="ARCH ELIBC KERNEL USERLAND" PWD="/home/monoid" PYTHONDONTWRITEBYTECODE="1" QMAKESPEC="linux-g++" QTDIR="/usr/qt/3" QUICKPKG_DEFAULT_OPTS="--include-config=y --include-unmodified-config=y" RESUMECOMMAND="wget -c -t 3 -T 60 --passive-ftp -O "${DISTDIR}/${FILE}" "${URI}"" RESUMECOMMAND_RSYNC="rsync -avP "${URI}" "${DISTDIR}/${FILE}"" RESUMECOMMAND_SSH="bash -c "x=\${2#ssh://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec rsync --rsh=\"ssh -p\${port}\" -avP \"\${host}:/\${x#*/}\" \"\$1\"" rsync "${DISTDIR}/${FILE}" "${URI}"" ROOT="/" ROOTPATH="/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.5.2:/opt/ibm/systemsim-cell/bin:/usr/qt/3/bin:/opt/cuda/computeprof/bin:/opt/cuda/bin" RPMDIR="/usr/portage/rpm" RUBY_TARGETS="ruby18" SESSION_MANAGER="local/monoid.intra.ispras.ru:@/tmp/.ICE-unix/5817,unix/monoid.intra.ispras.ru:/tmp/.ICE-unix/5817" SHELL="/bin/bash" SHLVL="6" SSH_AGENT_PID="5814" SSH_AUTH_SOCK="/tmp/ssh-mCyrGRSy5813/agent.5813" SYMLINK_LIB="yes" SYNC="rsync://mirror.yandex.ru/gentoo-portage" TERM="rxvt-unicode" USE="X alsa amd64 bash-completion berkdb bzip2 cairo cli cracklib cscope cups custom-optimization cxx dri fortran gif gpm graphviz gs gtk iconv ipv6 jpeg jpeg2k mmx modules mp3 mudflap multilib ncurses newspr nptl nptlonly openal opengl openmp pcre png pppd readline session sse sse2 ssl svg sysfs system-sqlite tcpd tiff truetype unicode vim-pager vim-syntax vim-with-x vorbis xml xorg zlib" ALSA_CARDS="hda-intel" 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="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 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" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en ru" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="nvidia" 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" USER="monoid" USERLAND="GNU" USE_EXPAND="ALSA_CARDS ALSA_PCM_PLUGINS APACHE2_MODULES APACHE2_MPMS CALLIGRA_FEATURES CAMERAS COLLECTD_PLUGINS CROSSCOMPILE_OPTS DRACUT_MODULES DVB_CARDS ELIBC FCDSL_CARDS FOO2ZJS_DEVICES FRITZCAPI_CARDS GPSD_PROTOCOLS GRUB_PLATFORMS INPUT_DEVICES KERNEL LCD_DEVICES LINGUAS LIRC_DEVICES MISDN_CARDS NETBEANS_MODULES NGINX_MODULES_HTTP NGINX_MODULES_MAIL OFED_DRIVERS PHP_TARGETS QEMU_SOFTMMU_TARGETS QEMU_USER_TARGETS RUBY_TARGETS SANE_BACKENDS USERLAND VIDEO_CARDS XFCE_PLUGINS XTABLES_ADDONS" USE_EXPAND_HIDDEN="CROSSCOMPILE_OPTS ELIBC KERNEL USERLAND" USE_ORDER="env:pkg:conf:defaults:pkginternal:repo:env.d" VIDEO_CARDS="nvidia" VISUAL="vim" WINDOWID="46147588" WINDOWPATH="7" XAUTHORITY="/home/monoid/.Xauthority" XDG_DATA_DIRS="/usr/local/share:/usr/share:/usr/share" 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" _="/usr/bin/emerge" bash4="4.1.2(2)-release"
Maybe it's triggered if FifoIpcDaemon re-opens the fifo before ebuild-ipc has closed its end of the pipe. I'll make a test case to see if that kind of scenerio triggers POLLHUP.
(In reply to comment #1) > Maybe it's triggered if FifoIpcDaemon re-opens the fifo before ebuild-ipc has > closed its end of the pipe. This should fix it: http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=c36768027d04f10f7af4402f642e93144d1b353b
This should be fixed in 2.1.10.46 and 2.2.0_alpha86. Please re-open if the problem continues.
*** Bug 373233 has been marked as a duplicate of this bug. ***
