With kernels (3.12.0 in my case) compiled with gcc-4.8.1 I experience severel problems probably related to unix pipes. Package emerging hangs during the install phase in an epoll_wait(3, ... system call. e.g. "emerge @module-rebuild" where it would in my case rebuild nvidia-drivers and VirtualBox drivers hangs during dependency calculation. Error Messages like this in my cron output (probably from makewhatis): bzcat: I/O or other error, bailing out. Possible reason follows. bzcat: Broken pipe Input file = /usr/share/man/man5/./make.conf.5.bz2, output file = (stdout) Kernels compiled with gcc-4.7.3 do not expose those issues. Reproducible: Always Steps to Reproduce: 1.compile kernel with gcc-4.8.1 2.boot it 3.try the above mentioned actions Portage 2.2.7 (default/linux/amd64/13.0/desktop/gnome, gcc-4.8.1, glibc-2.17, 3.12.0-gentoo-tom_1 x86_64) ================================================================= System uname: Linux-3.12.0-gentoo-tom_1-x86_64-Intel-R-_Core-TM-_i7_CPU_920_@_2.67GHz-with-gentoo-2.2 KiB Mem: 6107368 total, 395320 free KiB Swap: 6399996 total, 6336584 free Timestamp of tree: Fri, 15 Nov 2013 11:15:01 +0000 ld GNU ld (GNU Binutils) 2.23.2 distcc 3.1 x86_64-pc-linux-gnu [disabled] ccache version 3.1.9 [disabled] app-shells/bash: 4.2_p45 dev-java/java-config: 2.2.0::java-overlay dev-lang/python: 2.7.5-r4, 3.2.5-r3, 3.3.2-r2 dev-util/ccache: 3.1.9-r3 dev-util/cmake: 2.8.12 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.4_p6-r1, 1.9.6-r3, 1.10.3, 1.11.6, 1.12.6, 1.13.2, 1.14 sys-devel/binutils: 2.23.2 sys-devel/gcc: 4.6.4, 4.7.3-r1, 4.8.1-r1 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.11 (virtual/os-headers) sys-libs/glibc: 2.17 Repositories: gentoo local zugaina science ramereth kde-sunset eva eyolfson bitcoin ladi bangert java-overlay proaudio tmacedo amielke-overlay retroshare-overlay sunrise foo-overlay maggu2810-overlay gentoo-zh roslin gentoo-haskell Krontage armagetron ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=native -msse4.1 -pipe -ggdb" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/maven-bin-3.0/conf /usr/share/maven-bin-3.1/conf /usr/share/polkit-1/actions /var/bind /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.4/ext-active/ /etc/php/apache2-php5.5/ext-active/ /etc/php/cgi-php5.4/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cli-php5.4/ext-active/ /etc/php/cli-php5.5/ext-active/ /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" CXXFLAGS="-O2 -march=native -msse4.1 -pipe -ggdb" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--jobs --load-average=10 --with-bdeps y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs compressdebug config-protect-if-modified distlocks ebuild-locks fixlafiles installsources merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="ftp://gentoo.inode.at/source http://gentoo.inode.at ftp://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/" LANG="en_US.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j8" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-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="/usr/local/portage /var/lib/layman/zugaina /var/lib/layman/science /var/lib/layman/ramereth /var/lib/layman/kde-sunset /var/lib/layman/eva /var/lib/layman/eyolfson /var/lib/layman/bitcoin /var/lib/layman/ladi /var/lib/layman/bangert /var/lib/layman/java-overlay /var/lib/layman/pro-audio /var/lib/layman/tmacedo /var/lib/layman/amielke-overlay /var/lib/layman/retroshare-overlay /var/lib/layman/sunrise /var/lib/layman/foo-overlay /var/lib/layman/maggu2810-overlay /var/lib/layman/gentoo-zh /var/lib/layman/roslin /var/lib/layman/haskell /var/lib/layman/krontage /var/lib/layman/armagetron" SYNC="rsync://rsync1.at.gentoo.org/gentoo-portage" USE="X a52 aac aalib acl acpi alsa amd64 amr apache2 avahi avi bash-completion berkdb bitmap-fonts bluetooth branding bzip2 cairo caps cdda cdr cli clutter colord cpdflib cracklib crypt css cuda cups curl curlwrappers cxx dba dbus dga dio divx4linux dri dts dv dvd dvdr dvdread eds emboss encode evo exif fam ffmpeg fftw firefox flac flash foomaticdb fortran ftp fuse gconf gd gdbm gif glitz gmp gnome gnome-keyring gnome-online-accounts gphoto2 gpm gstreamer gtk gtk2 gtk3 gtkhtml iconv icu ieee1394 imagemagick imap imlib introspection ipv6 jack java java6 javascript jpeg kipi ladspa lcms ldap libcaca libnotify libsecret libvisual logrotate lzo mad matroska mbrola mime ming mmx mng modules mono mp3 mp4 mpeg mudflap multilib mysql nas nautilus ncurses networkmanager nls nptl nptlonly nvidia odbc ogg opengl openmp osc pam pango pcmcia pcre pdf pdflib php plotutils png pnp policykit ppds pulseaudio qt3support qt4 quicktime readline samba scanner sdl session sharedmem shotwell smartcard smp socialweb sockets sox speex spell sse sse2 ssl ssse3 startup-notification svg systemd tcpd theora threads tiff tracker truetype type1 udev udisks unicode upower usb userlocales utf8 v4l v4l2 vcd vdpau vhosts vorbis wifi win32codecs wxwidgets wxwindows x264 xattr xcb xinerama xml xml2 xrandr xulrunner xv xvid xvmc zeitgeist zlib zvbi" 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" APACHE2_MODULES="unixd actions authn_core authz_core alias auth_basic auth_digest authn_anon authn_dbd authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif so socache_shmcb speling status unique_id userdir usertrack vhost_alias" APACHE2_MPMS="event" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" 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="evdev keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="pdfimport" LINGUAS="en de" NGINX_MODULES_HTTP="access auth_basic autoindex browser charset empty_gif fastcgi geo gzip limit_conn limit_req map memcached proxy referer rewrite scgi split_clients ssi upstream_ip_hash userid uwsgi sub" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-4" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2 python3_3" QEMU_USER_TARGETS="arm" RUBY_TARGETS="ruby19 ruby18" SANE_BACKENDS="pixma net" 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" USE_PYTHON="2.7 3.2 3.3" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS
Looks like a duplicate of bug #487558. Which version of nvidia-drivers do you have?
nividia-drivers-331.20 ... doesn't look even similar to bug #487558 to me. My problems are reproducable and happen always in the same way. Compiling the kernel with gcc-4.7.3 completeley removes all those issues. So it clearly looks like some gcc-4.8.1<->kernel problem to me. Broken optimizations, whatever...
1) Please attach/post relevant dmesg output. 2) Please attach your kernel .config to this bug report.
Created attachment 363626 [details] 3.12.0 kernel config
Seems not to be gcc-4.8.1 issue. I've rebuilt everything including the kernel with gcc-4.7.3 and got the same "epoll_wait(3, .." hang when emerging libseccomp at the end of the qmerge phase. Though, the "bzcat: I/O or other error, bailing out. ..." errors have disappeared. I'll go back to a 3.11 kernel and try again. No dmesg output.
emerging works on 3.11.6, so this is probably a linux-3.12.0 related issue. I just wonder how I managed to reemerge the whole @world using gcc-4.7.3 yesterday because I'm pretty sure I did it on 3.12.0 only using a gcc-4.7.3 compiled kernel? I hope this is not some kind of nondeterministic error.
... but on 3.11.6 the > bzcat: I/O or other error, bailing out. Possible reason follows. > bzcat: Broken pipe > Input file = /usr/share/man/man1/./nvidia-smi.1.bz2, output file = (stdout) are back again :(
Stop, do not investigate this report further. It's probably related to some patch from btrfs-next/master or libsata/for-next I merged in on my own. Emerging workes on an unmodified linux-3.12.0-gentoo kernel. I will have to investigate this further by my myself. Sorry for the inconvenience I may have caused.
It turned out to be a problem with the BFQ scheduler (using the BFQ patches from genpatches 3.12-1). Going back to CFQ remedied the issue.
