When shutting down or closing the session the system freezes, the screen only shows the wallpaper. Looking at /var/log/pax.log it seems that PaX is killing gnome-settings-daemon: Apr 4 22:21:54 baraddur kernel: [17932.102390] PAX: execution attempt in: (null), 00000000-00000000 00000000 Apr 4 22:21:54 baraddur kernel: [17932.102404] PAX: terminating task: /usr/libexec/gnome-settings-daemon(gnome-settings-):4934, uid/euid: 1000/1000, PC: 00000324375b2640, SP: 000003ad53d9f9b8 Apr 4 22:21:54 baraddur kernel: [17932.102416] PAX: bytes at PC: ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? Apr 4 22:21:54 baraddur kernel: [17932.102470] PAX: bytes at SP-8: 0000000000000000 0000032451fbc5a9 000003ad53d9fad8 0000000000000000 0000000000000000 0000002a1752a420 000003ad53d9fad0 0000032451fbc5f5 0000000000000000 0000032451fa6093 0000000000000000 This is the content of /var/log/syslog before I had to do a hard reset: Apr 4 22:21:54 baraddur shutdown[18125]: shutting down for system halt Apr 4 22:21:57 baraddur init: Switching to runlevel: 0 Apr 4 22:22:00 baraddur sshd[4737]: Received signal 15; terminating. Apr 4 22:22:00 baraddur smartd[4665]: smartd received signal 15: Terminated Apr 4 22:22:00 baraddur smartd[4665]: smartd is exiting (exit status 0) Apr 4 22:22:11 baraddur dnsmasq[4539]: saliendo al recibir SIGTERM Reproducible: Always Steps to Reproduce: 1. Close session or shutdown. 2. See frozen screen. jorgeml@baraddur ~ $ sudo emerge --info Portage 2.1.10.49 (hardened/linux/amd64, gcc-4.5.3, glibc-2.13-r4, 3.2.2-hardened-r1 x86_64) ================================================================= System uname: Linux-3.2.2-hardened-r1-x86_64-AMD_Phenom-tm-_II_X6_1055T_Processor-with-gentoo-2.0.3 Timestamp of tree: Wed, 04 Apr 2012 14:45:01 +0000 distcc 3.1 x86_64-pc-linux-gnu [disabled] app-shells/bash: 4.2_p20 dev-java/java-config: 2.1.11-r3 dev-lang/python: 2.7.2-r3, 3.2.2 dev-util/cmake: 2.8.6-r4 dev-util/pkgconfig: 0.26 sys-apps/baselayout: 2.0.3 sys-apps/openrc: 0.9.8.4 sys-apps/sandbox: 2.5 sys-devel/autoconf: 2.13, 2.68 sys-devel/automake: 1.9.6-r3, 1.10.3, 1.11.1 sys-devel/binutils: 2.21.1-r1 sys-devel/gcc: 4.5.3-r2 sys-devel/gcc-config: 1.5-r2 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r1 sys-kernel/linux-headers: 3.1 (virtual/os-headers) sys-libs/glibc: 2.13-r4 Repositories: gentoo lcd-filtering ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=native -O2 -pipe -floop-interchange -floop-strip-mine -floop-block" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /usr/share/themes/oxygen-gtk/gtk-2.0 /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/games/angband/edit/ /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="-march=native -O2 -pipe -floop-interchange -floop-strip-mine -floop-block" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--with-bdeps=y --jobs" FEATURES="assume-digests binpkg-logs buildsyspkg collision-protect distlocks ebuild-locks fixlafiles news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch xattr" FFLAGS="" GENTOO_MIRRORS="http://gentoo.tiscali.nl/ http://ftp.snt.utwente.nl/pub/os/linux/gentoo" LANG="es_ES.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LINGUAS="es_ES es en en_GB" MAKEOPTS="-j 12 -l 10" 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="/var/lib/layman/lcd-filtering" SYNC="rsync://rsync.nl.gentoo.org/gentoo-portage" USE="3dnow 3dnowext 64bit X a52 aac aacplus acl addressbook alsa amd64 amr apng artworkextra aspell assistant audio autoipd avahi avcodec avformat banshee bash-completion berkdb bittorrent bluetooth boo bookmarks bootchart bpm branding bzip2 cairo calendar call caps cdda cdparanoia cdr celt cheese chromium cli clucene clutter colord connection-sharing consolekit coverart cracklib crypt css cups cxx daap dbus declarative detex dirac dmraid download dri drm dtmf dts dvd ebook eds embedded evo exif extensions extra extras fam fat festival ffmpeg firefox firefox-bookmarks firefox3 flac flickr fluidsynth fontconfig fts fuse gallium games gdbm gdm gdu gedit gensplash geoip geolocation gif git glchess glitz gnome gnome-keyring gnome-online-accounts gnome-shell gnutls gphoto2 gpm graphics graphite grub gsm gstreamer gtk gtk3 gudev hardened history holidays howl-compat hpcups hpijs hwdb hyperestraier icons iconv icu id3tag idn ieee1394 image innodb inotify ios iphone iplayer iptc ipv6 irc ithreads jabber java javascript jingle jpeg justify karma kdrive keymap kpathsea kqemu kvm lame lastfm lastfmfingerprint latex latex3 lcdfilter lcms lensfun libcanberra libkms libnotify libvirtd lightning lm_sensors lvm lyrics lzma lzo mad map matroska mbrola mdadm mdnsresponder-compat mikmod mjpeg mmx mmxext mng modules mono mp3 mp3tunes mpeg mpi mplayer mtp mudflap multilib music musicbrainz mysql nautilus ncurses networkmanager nls nodrm nowlistening nptl nptlonly nsplugin ntfs offensive ofx ogg ogm opengl openmp otr pam pango parted passiv pax_kernel pcap pcre pdf pdfimport playlist plugins pm-utils png policykit pppd privacy private-headers projectm pulseaudio python qalculate qemu qt3support rdesktop rdp readline redeyes resolvconf romio rss rubber samba sasl scanner schroedinger science sdl search secure-delete seed sendto sensord session shutdown sip sipim skype smp socialweb sound speex spell spice sql sqlite sse sse2 ssl startup-notification stats stream stun subtitles subversion svg switcher symlink synctex sysfs syslog system-sqlite system-v8 taglib tcpd telepathy templates terminal test-programs tex4ht texteffect theora threads thumbnail thumbnails tidy tiff totem tracker truetype udev unicode unlock-notify upnp urandom usb usbredir uswsusp utils v4l v4l2 vaapi vala vcd vcdx vde vhosts video videos vim vim-pager vim-syntax virt-network vlc vnc vorbis vpx wav wavpack web webcam webgl webinterface webkit webm webp webpresence webstart x264 xattr xcb xcomposite xine xml xmp xorg xscreensaver xulrunner xv xvid youtube zeitgeist zeroconf zip zlib" ALSA_CARDS="snd-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 sheets stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog contextswitch cpu cpufreq entropy filecount hddtemp java mysql network notify_desktop processes protocols sensors thermal uptime users vmem" DRACUT_MODULES="lvm mdraid syslog plymouth" 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" GRUB_PLATFORMS="pc" INPUT_DEVICES="evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="es_ES es en en_GB" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="radeon" 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
I can confirm that gnome-settings-daemon-3.2.2-r1 and 3.2.3 is killed by PaX on a hardened system when logging out of a gnome-3 or cinnamon session. However, I cannot reproduce the system freeze, and I therefore suspect that it is being caused by something else. @hardened, can you suggest how to debug the gnome-settings-daemon PaX crash? Judging by the log, it is being caused by a null function pointer dereference somewhere, but if I ssh in from another machine and attach gdb to the gnome-settings-daemon process, I simply get "Program terminated with signal SIGKILL, Killed." at logout without a chance to get a backtrace.
I did some further investigation with the help of SSH an additional machine. While logged in GNOME I used skill to kill my user session and I was kicked backed to the GDM login screen. I tried to stop the XDM service but it did not work (GDM still on the screen). Gnome-settings-daemon was still running and it was not possible to kill it. At the moment I am running PaX in softmode and I can shutdown properly. Please let me know if I can help with the troubleshooting.
(In reply to comment #1) > @hardened, can you suggest how to debug the gnome-settings-daemon PaX crash? > Judging by the log, it is being caused by a null function pointer > dereference somewhere, but if I ssh in from another machine and attach gdb > to the gnome-settings-daemon process, I simply get "Program terminated with > signal SIGKILL, Killed." at logout without a chance to get a backtrace. If PaX is killing it, you'll get some information in the dmesg logs. strace or gdb will show what it was doing before the SIGKILL which maybe useful. Can you post strace -f leading up to the SIGKILL as well as the last lines of dmesg.
Please try with 3.6
Thanks for your work on this. Unfortunately I am not longer using Gentoo so I cannot test this. Sorry about that.
Ok well, feel free to reopen if your ever try it again.
