Bug 209209 – kde-base/kdm-4.0.x - logging in as root causes segfault

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Andriy Baranskyy 2008-02-07 09:56:46 UTC]

After the upgrade to KDE-4 (both 4.0.0 and 4.0.1), kdm crashes when trying to login as root producing the following segfault message in dmesg: kdm[3577]: segfault at 00000000 eip 08051154 esp bfe2bc50 error 4. After this X restarts and brings me back to the login screen.
Please note that my kdmrc file has AllowRootLogin=true.

Reproducible: Always

Steps to Reproduce:
0. Modify kdmrc to allow root logins
1. Install kdm-4.0.0 or kdm-4.0.1
2. Login as root through the GUI screen

Actual Results:  
kdm[3577]: segfault at 00000000 eip 08051154 esp bfe2bc50 error 4

Expected Results:  
Successful commit as root, which may be useful in some situations

[Comment 1 Andriy Baranskyy 2008-02-07 10:12:49 UTC]

p.s. http://forums.gentoo.org/viewtopic-t-649709-highlight-kde+root.html

[Comment 2 Jakub Moc (RETIRED) 2008-02-07 16:10:41 UTC]

Stick a backtrace and emerge --info here as the bug page told you.

http://www.gentoo.org/proj/en/qa/backtraces.xml

[Comment 3 Andriy Baranskyy 2008-02-07 16:18:52 UTC]

emerge --info:
Portage 2.1.4.1 (default-linux/x86/2007.0, gcc-4.2.2, glibc-2.7-r1, 2.6.24-tuxonice i686)
=================================================================
System uname: 2.6.24-tuxonice i686 Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz
Timestamp of tree: Thu, 07 Feb 2008 13:30:01 +0000
ccache version 2.4 [enabled]
app-shells/bash:     3.2_p33
dev-java/java-config: 1.3.7, 2.0.33-r1
dev-lang/python:     2.5.1-r5
dev-python/pycrypto: 2.0.1-r6
dev-util/ccache:     2.4-r7
sys-apps/baselayout: 2.0.0_rc6-r1
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r1
sys-devel/automake:  1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils:  2.18-r1
sys-devel/gcc-config: 1.4.0-r2
sys-devel/libtool:   1.5.26
virtual/os-headers:  2.6.24
ACCEPT_KEYWORDS="x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/kde/4.0/env /usr/kde/4.0/share/config /usr/kde/4.0/shutdown /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/terminfo /etc/texmf/web2c /etc/udev/rules.d"
CXXFLAGS="-O2 -march=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="ccache distlocks metadata-transfer sandbox sfperms strict unmerge-orphans userfetch"
GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo"
LINGUAS="en pl uk be de"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="3dfx 3dnow 3dnowext 7zip X Xaw3d a52 aac aalib accessibility acl acpi adns alsa amr amrnb amrr amrwb ao arts automount bash-completion berkdb bidi bitmap-fonts bluetooth branding bzip2 c++ cairo caps cddb cdparanoia cisco cli cpudetection cracklib crypt css cups curl daap dbus dga directfb divx dri dts dv dvd dvdnav dvdr dvdread emovix enca encode exif fam fax fbcon ffmpeg firefox flac font-server fontconfig fortran ftp gd gdbm geoip ggi gif glib glitz gmail gmedia gnutls gpg2-experimental gphoto2 gpm gsm gtk hal htmlhandbook http hyperestraier iconv icq imagemagick inotify ipod ipv6 ipw3945 isdnlog java javascriptjpeg jpeg2k justify kde kdrive kerberos ladspa lame latex ldap libcaca libwww lilo live lm_sensors lzo mad matroska matrox mbrola md5sum midi mjpeg mmap mmxmmxext mng modplug motif mp2 mp3 mp4 mp4live mpeg mpeg2 mplayer msn mtp mudflap musepack musicbrainz mysql nas ncurses neXt net netbeans netboot network network-cron networking nfs nis nls nptl nptlonly nsplugin ntp nvidia nvram nvtv obex odbc ogg openal openct openexr opengl openmp openssh openvpn oss overlays pam pch pcmcia pcre pcsc-lite pda pdf perl pic player plotutils plugins pmu png portaudio pppd pulseaudio python qt-static qt3 qt3support qt4 quicktime radiorar raw readline real realmedia reflection rtc samba sasl scanner sdl session slang slp smartcard sndfile snmp speech speex spell spl sql sqlite sqlite3 srtsse sse2 ssl ssse3 svg tcpd tetex tga theora threads tiff tk truetype truetype-fonts type1-fonts unicode usb v4l v4l2 vcd vidix visualization vorbis wav wavpack wifi win32codecs wma wmf wmp wxwindows x264 x86 xanim xcb xcomposite xine xinerama xorg xpm xprint xv xvid xvmc yv12 zeroconf zip 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 mulaw multi null plug rateroute 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 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" ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en pl uk be de" USERLAND="GNU" VIDEO_CARDS="nvidia nv vesa"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LDFLAGS, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

[Comment 4 Andriy Baranskyy 2008-02-07 16:20:20 UTC]

Not sure how to do a backtrace in this case.

[Comment 5 Andriy Baranskyy 2008-02-17 01:31:59 UTC]

Recompiled kdm-4.0.1 without kerberos and pam use flags and the issue seems to have been fixed.