With a regular system update I got the new glibc-2.20-r2. Since then my /var/log/messages fills with entries like: Mar 23 20:53:25 kiste kernel: traps: libvirtd[2065] trap invalid opcode ip:7f25ec34993a sp:7f25de1c2528 error:0 in libpthread-2.20.so[7f25ec33e000+16000] Mar 23 20:53:26 kiste kernel: traps: lightdm[2174] trap invalid opcode ip:7f1b1cdc693a sp:7ffcf413f658 error:0 in libpthread-2.20.so[7f1b1cdbb000+16000] Mar 23 20:53:26 kiste kernel: traps: ntpd[2028] trap invalid opcode ip:7f8c5e1e993a sp:7ffc5b933178 error:0 in libpthread-2.20.so[7f8c5e1de000+16000] Mar 23 21:09:38 kiste kernel: traps: dbus-daemon[1508] trap invalid opcode ip:7f0c4e7ef93a sp:7ffefcb1d118 error:0 in libpthread-2.20.so[7f0c4e7e4000+16000] Mar 23 21:10:22 kiste kernel: traps: libvirtd[2060] trap invalid opcode ip:7f946636493a sp:7f94581dd528 error:0 in libpthread-2.20.so[7f9466359000+16000] Affected software includes: accounts-daemon conftest dbus-daemon libvirtd lightdm ntpd polkitd systemd-udevd Since that update I'm unable to login via lightdm. I already did 'emerge -aev @world' twice since Monday. Reproducible: Always Steps to Reproduce: 1. Update to glibc-2.20-r2 2. Reboot 3. grep traps /var/log/messages Expected Results: libpthread-2.20.so within glibc should be fixed. Portage 2.2.14 (python 3.3.5-final-0, default/linux/amd64/13.0, gcc-4.8.3, glibc-2.20-r2, 3.18.9-gentoo x86_64) ================================================================= System uname: Linux-3.18.9-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E3-1245_v3_@_3.40GHz-with-gentoo-2.2 KiB Mem: 15282980 total, 14592372 free KiB Swap: 0 total, 0 free Timestamp of tree: Wed, 25 Mar 2015 18:15:01 +0000 ld GNU ld (Gentoo 2.24 p1.4) 2.24 app-shells/bash: 4.2_p53 dev-java/java-config: 2.2.0 dev-lang/perl: 5.20.1-r4 dev-lang/python: 2.7.9-r1, 3.3.5-r1, 3.4.1 dev-util/cmake: 2.8.12.2-r1 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.13.11 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.69 sys-devel/automake: 1.11.6-r1, 1.12.6, 1.13.4 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.8.3 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.4 sys-devel/make: 4.1-r1 sys-kernel/linux-headers: 3.18 (virtual/os-headers) sys-libs/glibc: 2.20-r2 Repositories: gentoo local-overlay ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="*" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O1 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /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" CXXFLAGS="-O1 -pipe -march=native" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--autounmask n" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildpkg candy cgroup collision-protect compress-build-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms split-elog splitdebug strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org http://ftp-stud.hs-esslingen.de/pub/Mirrors/gentoo" LANG="de_DE.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j9" 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="/home/portage/local-overlay" SYNC="rsync://rsync.de.gentoo.org/gentoo-portage" USE="7zip X acl acpi aes aio alsa amd64 avx avx2 bash-completion berkdb bluetooth bluray bzip2 cairo caps clang cli consolekit cracklib crypt css cups curl cxx dbus dri dvb dvd dvdread encode exif flac fma3 fontconfig fortran fuse gdbm gif gmp gnuplot gnutls gtk gtk3 iconv icu imagemagick ipv6 jpeg latex lcms ldap libnotify libv4l lm_sensors logrotate lvm lzma matplotlib matroska mime mmap mmx mmxext mng modules multilib ncurses netlink nfs nls nptl nsplugin ntp numa ogg openal opencl opengl openmp oss pam pcap pch pcre pdf png policykit popcnt posix pulseaudio python rdesktop readline rrdtool samba sdl session sna spice sqlite sse sse2 sse3 sse4_1 sse4_2 ssl ssse3 startup-notification tcpd theora threads tiff tls truetype udev unicode upnp upower usb v4l vaapi vorbis webgl wxwidgets x264 x265 xattr xcb xcomposite xft xinerama xml xv 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" 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 author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" 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 ublox ubx" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="de en" NGINX_MODULES_HTTP="access" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="aarch64 arm x86_64" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="intel i965" XFCE_PLUGINS="logout menu trash" 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, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
It seems that my problems with lightdm (and slim as alternative) are connected to D-Bus causing a trap: traps: dbus-daemon[1344] trap invalid opcode ip:7f500460c93a sp:7ffffec43498 error:0 in libpthread-2.20.so[7f5004601000+16000] and crashing. This prevents lightdm/slim from connecting to D-Bus and getting required information. No login is possible.
This looks like a duplicate of bug 528712
I can confirm that loading the microcode in the boot runlevel or not at all seems to prevent this from occuring. On the other hand: as transactional memory seems to not work (Intel has updated micro code that disables it) wouldn't it be reasonable to check which CPU generation is installed within glibc. And have a whitelist that would enable transactional memory functions for just those CPUs that are known to work?
*** This bug has been marked as a duplicate of bug 528712 ***
