In the last days entering CTL-C at the bash prompt very often results in a logout: oot@gepard:/root(3)# uname -a Linux gepard 3.17.2-gentoo #1 SMP PREEMPT Sun Nov 2 00:11:48 CET 2014 x86_64 Intel(R) Core(TM) i7 CPU M 620 @ 2.67GHz GenuineIntel GNU/Linux root@gepard:/root(4)# ^C root@gepard:/root(4)# logout rose@gepard:/usr/local/portage/sci-libs/vtk(27)$ su - Passwort: ( I did not enter logout, this was generated by ^C ). rose@gepard:/usr/local/portage/sci-libs/vtk(29)$ emerge --info bash Portage 2.2.14 (python 2.7.8-final-0, default/linux/amd64/13.0/desktop/gnome/systemd, gcc-4.8.3, glibc-2.20, 3.17.2-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-3.17.2-gentoo-x86_64-Intel-R-_Core-TM-_i7_CPU_M_620_@_2.67GHz-with-gentoo-2.2 KiB Mem: 3903236 total, 930156 free KiB Swap: 12582908 total, 12544368 free Timestamp of tree: Tue, 11 Nov 2014 10:00:01 +0000 ld GNU ld (Gentoo 2.24 p1.4) 2.24 distcc[18536] (dcc_trace_version) distcc 3.2rc1 x86_64-pc-linux-gnu; built Nov 8 2014 22:04:16 [disabled] app-shells/bash: 4.3_p30-r1 dev-java/java-config: 2.2.0 dev-lang/perl: 5.20.1-r2 dev-lang/python: 2.7.8, 3.3.5-r1, 3.4.2 dev-util/cmake: 3.0.2 dev-util/pkgconfig: 0.28-r2 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.13.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.9.6-r3, 1.10.3, 1.11.6, 1.12.6, 1.14.1 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.8.3 sys-devel/gcc-config: 1.8 sys-devel/libtool: 2.4.3-r2 sys-devel/make: 4.1-r1 sys-kernel/linux-headers: 3.17-r1 (virtual/os-headers) sys-libs/glibc: 2.20 Repositories: gentoo sage-on-gentoo science sunrise x11 ago tlp local g-cpan g-octave Installed sets: @system ACCEPT_KEYWORDS="amd64 ~amd64" ACCEPT_LICENSE="* -@EULA PUEL Intel-SDP dlj-1.1 skype-eula skype-4.0.0.7-copyright googleearth AdobeFlash-11.x cadsoft Oracle-BCLA-JavaSE MakeMKV-EULA NVIDIA-CUDA Nero-AAC-EULA GIMPS" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=core2 -mtune=generic -Os -pipe -msse3 -msse4 -mcx16 -msahf -mpopcnt -mpreferred-stack-boundary=6" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /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-php5.6/ext-active/ /etc/php/cgi-php5.6/ext-active/ /etc/php/cli-php5.6/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="-march=core2 -mtune=generic -Os -pipe -msse3 -msse4 -mcx16 -msahf -mpopcnt -mpreferred-stack-boundary=6" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-march=core2 -mtune=generic -Os -pipe -msse3 -msse4 -mcx16 -msahf -mpopcnt -mpreferred-stack-boundary=6" GENTOO_MIRRORS="http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror http://ftp-stud.fht-esslingen.de/pub/Mirrors/gentoo/ ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo ftp://ftp.tu-clausthal.de/pub/linux/gentoo ftp://ftp.easynet.nl/mirror/gentoo/ " LANG="de_DE.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j5" 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_gepard" PORTDIR_OVERLAY="/var/lib/layman/sage-on-gentoo /var/lib/layman/science /var/lib/layman/sunrise /var/lib/layman/x11 /var/lib/layman/ago /var/lib/layman/tlp /usr/local/portage /var/lib/cpan /var/lib/g-octave" USE="64bit R X Xaw3d a52 aac acl acpi admin afs alsa amd64 ao apache2 apng applet archive armadillo arpack asf aspell atlas audacious audiofile automap automount bash-completion berkdb blas blast bluetooth bluray boost branding bzip2 cairo cdda cddb cdf cdio cdparanoia cdr cg cgi chm cli cmake colord cracklib crypt css cups curl cxx daap db dbi dbm dbus declarative designer devhelp device-mapper dga dia dirac djvu doc dot dri ds2490 ds9097 ds9097u dts dv dvb dvd dvdr dvi dynamicplugin eds egl elf emacs emboss emf encode epiphany evo examples exif expat extensions extra extras faac faad fam ffmpeg fftw firefox fits flac fltk fontconfig foomaticdb fortran fortran95 fpm fpx fuse g3dvl garmin gcj gd gdal gdbm gdu gedit geoip geolocation geos gfortran gif gimp git glade glamor glib glpk gml gmp gnome gnome-keyring gnome-online-accounts gnome-print gnuplot gnutls gold gphoto2 gpm grammar graphics graphtft graphviz grass gsl gsm gstreamer gtk gtk3 gudev guile hdaps hddtemp hdf hdf5 hdri html http httpd hvm hwdb iconv icq icu id3tag ide imagemagick imap inotify introspection ipod ipv6 irda ithreads jabber jadetex java java6 jbig jit john jpeg jpeg2k kate kdepim kdrive kerberos keymap kpathsea kvm ladspa lame lapack laptop latex lcms ldap lensfun libffi libkms libnotify libsamplerate libsecret lirc live lm_sensors lua lzma lzo mad mail maildir mapnik math matroska media-library mercurial mikmod mkl mmx mmxext mng mod modules mono motif mozilla mp3 mp4 mpeg mpi mplayer mtp multilib multimedia musepack musicbrainz mysql mysqli nautilus ncurses neXt netcdf netpbm network networking nfs nls nntp nptl nsplugin ntfs ntp numpy obex objc ocaml ocr octave odbc ofa ogdi ogg openexr opengl openmp openvg pam pango pcre pda pdf pdl2 perl plasma plotutils plugins png podcast policykit portaudio posix postgres postscript ppds preview-latex proj projectm pstricks pulseaudio python python-bindings q16 q32 qemu qhull qt3support qt4 quicktime raw readline reiserfs reports rle romio rpc rrdcgi rrdtool sage samba sasl schroedinger science sdk sdl secure-delete semantic-desktop server session shout sip slang slp smart smbclient smp sms sndfile snmp soap socialweb sockets sound soup sox speex spell sql sqlite sse sse2 sse4 sse4_1 sse4_2 ssl ssse3 startup-notification stlport subtitles subversion sudo suexec svg svm swig systemd szip t1lib tcl tcpd tex tex4ht texmacs theora thesaurus thinkpad threads thunderbird tidy tiff tk tools truetype udev udisks unicode upower usb utempter v4l vaapi vala valgrind vdpau video virt-network virtualbox visio vorbis vpx vtk wav webdav webdav-serf webkit wifi wmf wxwidgets x264 xa xattr xcb xetex xext xft xine xml xmlreader xmlrpc xpm xv xvid xvmc yaml youtube zlib zvbi" ABI_X86="64" ALSA_CARDS="intel8x0" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_core authn_dbm authn_default authn_file authz_core authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgid dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info lbmethod_byrequests log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif slotmem_shm so socache_shmcb speling status unique_id unixd userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="canon fuji ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CURL_SSL="nss" DRACUT_MODULES="caps lvm syslog" DVB_CARDS="usb-wt220u" 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="keyboard mouse evdev synaptics void" KERNEL="linux" LCD_DEVICES="cfontz hd44780 mtxorb ncurses X lcd2usb lcdlinux png usblcd" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="de fr ru" NETBEANS_MODULES="apisupport cnd dlight enterprise ergonomics groovy gsf harness ide identity j2ee java mobility nb php profiler websvccommon xml" OFFICE_IMPLEMENTATION="libreoffice" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" QEMU_SOFTMMU_TARGETS="arm i386 x86_64" QEMU_USER_TARGETS="arm i386 x86_64" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="nouveau displaylink" 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, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC, USE_PYTHON ================================================================= Package Settings ================================================================= app-shells/bash-4.3_p30-r1 was built with the following: USE="afs examples net nls plugins (readline) -bashlogger -mem-scramble -vanilla" ABI_X86="64" LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-rpath,/usr/lib64/bash"
that is funky. would you be able to capture strace of that since it reproduces so much ? is it new behavior to 4.3_p30 ? or did you just go from 4.2->4.3 ?
*** Bug 535952 has been marked as a duplicate of this bug. ***
If I login to orca, I use the following command xterm -bg black -fg white -sb -sl 500 -T orca -n orca -e ssh $X11FORWARD orca If I become root at orca (su -) almost every CTL-C logs me out as root, see also bug 535952. If I enter CTL-C as user rose (before or after I switched to root) at orca, CTL-C did at the last tests, what I expected ( I am not logged out). I can reproduce this behaviour, if I run strace xterm -bg black -fg white -sb -sl 500 -T orca -n orca -e ssh $X11FORWARD orca Is this the way, how I should use strace? At least the other way. First running xterm -bg black -fg white -sb -sl 500 -T orca -n orca -e ssh $X11FORWARD orca and then running strace su - does not work, because the second command fails immediatly with: ... read(4, "", 4096) = 0 close(4) = 0 munmap(0x7f28e3d78000, 4096) = 0 sendto(3, 0x120fda0, 53, MSG_NOSIGNAL, NULL, 0) = 53 close(3) = 0 exit_group(1) = ? +++ exited with 1 +++ The issues with losing of echo also described in bug 53595, happens also with local xterm for root, which was started with: xterm -u8 -ls -sb -sl 1000 -bg black -fg green -e su - Mostly 'strace xterm -u8 -ls -sb -sl 1000 -bg black -fg green -e su -' fails immediatly. But just now I could enter the root password and 'll' and ''CTL-c and was logged out again. The last output was: poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) read(4, "l", 4096) = 1 read(4, 0x11544dc, 4096) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{"M\1\5\0\30\0\240\3\27\0\240\3\225\0008\1\0 \4\0M\1\5\0\30\0\240\3\27\0\240\3"..., 60}, {NULL, 0}, {"", 0}], 3) = 60 recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\3.\327\3\230z|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\0\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\2.\327\3\370z|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\0\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) write(4, "l", 1) = 1 recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [4]) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) read(4, "l", 4096) = 1 read(4, 0x11544dc, 4096) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{"M\1\5\0\30\0\240\3\27\0\240\3\233\0008\1\0 \4\0M\1\5\0\30\0\240\3\27\0\240\3"..., 60}, {NULL, 0}, {"", 0}], 3) = 60 recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\3.\332\3`{|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\0\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\2%\332\3p}|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\0\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\0026\332\3\320~|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\4\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) write(4, "\3", 1) = 1 recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [4]) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) read(4, "^C\r\nroot@impala:/root(1)# ", 4096) = 26 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{"M\1\5\0\30\0\240\3\27\0\240\3\241\0008\1\0 \4\0M\2\5\0\30\0\240\3\27\0\240\3"..., 40}, {NULL, 0}, {"", 0}], 3) = 40 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) ioctl(3, FIONREAD, [0]) = 0 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) ioctl(3, FIONREAD, [0]) = 0 read(4, 0x11544dc, 4096) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{"=\0\4\0\36\0\240\3\2\0\326\0\n\0\1\0E \n\0\36\0\240\3\10\0\240\3\0\0\240\3"..., 496}, {NULL, 0}, {"", 0}], 3) = 496 recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\16\0\342\3\30\0\240\3\0\0>\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, {0, 0}) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\0036\352\3X\177|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\4\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\3%\352\3\250\177|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\4\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [3]) recvmsg(3, {msg_name(0)=NULL, msg_iov(1)=[{"\2.\352\3_\214|\33\301\2\0\0\30\0\240\3\0\0\0\0\343\10\270\5\330\0\320\0\0\0\1\0", 4096}], msg_controllen=0, msg_flags=0}, 0) = 32 recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) write(4, "l", 1) = 1 recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa910, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) recvmsg(3, 0x7fffe88aabf0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) select(5, [3 4], [], NULL, NULL) = 1 (in [4]) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa9f0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) read(4, "llogout\r\n", 4096) = 9 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN|POLLOUT}], 1, 4294967295) = 1 ([{fd=3, revents=POLLOUT}]) writev(3, [{"M\1\5\0\30\0\240\3\27\0\240\3\225\0008\1\0 \n\0M\7\10\0\30\0\240\3\27\0\240\3"..., 52}, {NULL, 0}, {"", 0}], 3) = 52 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) ioctl(3, FIONREAD, [0]) = 0 recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=28912, si_uid=1203, si_status=130, si_utime=2, si_stime=0} --- wait4(-1, NULL, 0, NULL) = 28912 rt_sigaction(SIGCHLD, {0x42cd40, [CHLD], SA_RESTORER|SA_RESTART, 0x7f4c33b824b0}, {0x42cd40, [], SA_RESTORER|SA_RESTART|SA_NOCLDSTOP, 0x7f4c33b824b0}, 8) = 0 wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes) rt_sigreturn() = -1 EAGAIN (Resource temporarily unavailable) recvmsg(3, 0x7fffe88aa8e0, 0) = -1 EAGAIN (Resource temporarily unavailable) poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) ioctl(3, FIONREAD, [0]) = 0 read(4, 0x11544dc, 4096) = -1 EIO (Input/output error) kill(4294938384, SIGHUP) = -1 ESRCH (No such process) rt_sigaction(SIGCHLD, {SIG_DFL, [], SA_RESTORER|SA_RESTART, 0x7f4c33b824b0}, {0x42cd40, [CHLD], SA_RESTORER|SA_RESTART, 0x7f4c33b824b0}, 8) = 0 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f4c3577ca50) = 29482 wait4(29482, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 29482 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=29482, si_uid=1203, si_status=0, si_utime=0, si_stime=0} --- rt_sigaction(SIGCHLD, {0x42cd40, [CHLD], SA_RESTORER|SA_RESTART, 0x7f4c33b824b0}, NULL, 8) = 0 ioctl(4, TCFLSH, 0x1) = 0 close(4) = 0 exit_group(0) = ? +++ exited with 0 +++
I just tried: strace -f xterm -u8 -ls -sb -sl 1000 -bg black -fg green -e su - I can enter the root password. But then the command exits immediatly with: poll([{fd=3, events=POLLIN}], 1, 0) = 0 (Timeout) read(4, 0xe744dc, 4096) = -1 EIO (Input/output error) kill(4294937484, SIGHUP) = -1 ESRCH (No such process) ioctl(4, TCFLSH, 0x1) = 0 close(4) = 0 exit_group(0) = ? +++ exited with 0 +++
you won't be able to strace it directly because it's a set*id program. you have to run `su -` like normal, then in a diff terminal attach `strace -f` to it, and then do the things to trigger the bad behavior. also, please use the "-o log" option to strace and attach the logs instead of pasting as large comments. you might want to check /dev/pts/ permissions ... i've noticed that when they're incorrect, the new bash can't take over the tty, so the CTRL+C will kill it and the parent bash will resume.
