We are having some problems with mythbackend randomly shuting down. It seems to happen under larger loads, like simultaineously 2 programs recording, 2 programs going the commercial flagging and maybe 2 or 3 people on the network watching programs. Each time it happens I get different data in mythbackend.log which will be attached after I post this. No messages about this appear in dmesg. There is some stuff in /var/log/messages that may be part of it so I'm including that in the attachment also. dragonfly ~ # emerge --info Portage 2.1.1-r2 (default-linux/x86/2006.0, gcc-4.1.1, glibc-2.4-r4, 2.6.17-gentoo-r2 i686) ================================================================= System uname: 2.6.17-gentoo-r2 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz Gentoo Base System version 1.12.6 Last Sync: Fri, 08 Dec 2006 21:00:01 +0000 app-admin/eselect-compiler: [Not Present] dev-java/java-config: 1.3.7, 2.0.30 dev-lang/python: 2.3.5-r2, 2.4.3-r4 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.60 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.13-r4 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.17-r2 ACCEPT_KEYWORDS="x86" AUTOCLEAN="yes" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=pentium4 -fomit-frame-pointer -pipe" CHOST="i686-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.3/env /usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3.4/env /usr/kde/3.4/share/config /usr/kde/3.4/shutdown /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config" CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/gconf /etc/java-config/vms/ /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-O2 -march=pentium4 -fomit-frame-pointer -pipe" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://gentoo.osuosl.org/ http://gentoo.seren.com/gentoo ftp://gentoo.mirrors.tds.net/gentoo" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/home/portage_temp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="x86 X alsa apache2 audiofile berkdb bitmap-fonts caps cdr cli cracklib crypt cups dlloader dri dvd dvdr dvdread eds elibc_glibc emboss encode firebird flac fluidsynth foomaticdb fortran gdbm gif gimp gimpprint gnome gpm gstreamer gtk gtk2 i8x0 iconv imlib input_devices_keyboard input_devices_mouse ipv6 isdnlog jack jack-tmpfs jpeg kde kernel_linux ladcca ladspa libg++ libwww mad mikmod mjpeg mmx motif mp3 mpeg mysql mythtv ncurses nls nptl nptlonly ogg opengl oss pam pcre perl png ppds pppd python qt3 qt4 quicktime readline reflection sdl session sndfile spell spl sse sse2 ssl tcltk tcpd threads transcodei truetype truetype-fonts type1-fonts udev usb userland_GNU userlocales v4l v4l2 video_cards_i810 video_cards_mesa vorbis xml xorg xscreensaver xv xvid zlib" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LC_ALL, LDFLAGS, LINGUAS, PORTAGE_RSYNC_EXTRA_OPTS dragonfly ~ # dragonfly ~ # uname -a Linux dragonfly 2.6.17-gentoo-r2 #4 SMP PREEMPT Fri Nov 24 14:20:30 PST 2006 i686 Intel(R) Pentium(R) 4 CPU 3.00GHz GenuineIntel GNU/Linux dragonfly ~ # dragonfly ~ # eix -I ivtv * media-tv/ivtv Available versions: 0.4.5 ~0.4.7 ~0.4.8 0.6.3 ~0.6.4 ~0.6.5 0.7.1 ~0.7.2 [M]0.8.0 [M]0.8.0-r1 [M]0.8.1 [M]0.8.1-r1 [M]0.9.0 Installed: 0.7.1 Homepage: http://www.ivtvdriver.org Description: ivtv driver for Hauppauge PVR PCI cards dragonfly ~ # eix -I mythtv * media-tv/mythtv Available versions: 0.19_p10505 0.20_p11244 0.20_p11281 0.20_p11444 0.20_p11626 Installed: 0.20_p11626 Homepage: http://www.mythtv.org Description: Homebrew PVR project * x11-themes/mythtv-themes Available versions: 0.19 0.20 Installed: 0.20 Homepage: http://www.mythtv.org/ Description: A collection of themes for the MythTV project. Found 2 matches. dragonfly ~ #
Created attachment 104864 [details] mythbackend crash info
I have had a second crash with the same sort of failure. It's about 3 weeks since I posted the first crash and haven't received a response of any type so far. Attaching tonight's crash results after this posting.
Created attachment 107232 [details] mythbackend crash - 2nd time
None of the crashes are happening in MythTV code. All your crashes are happening in glibc which is odd. It's possible that something is just screwy with your system. If you say it's under high load then it could be a chipset/memory/kernel issue. It could also be heat flipping a bit. There really is no code that can be fixed or any magical fix. If you did the same thing on a totally different box, then it would run fine.
Since the time I posted these crashes I switched back to a UP kernel. The crashes almost never happen now. Once every 2 weeks instead of twice a day. While this is better it's not perfect. It might possibly be a heat issue. That's a good thing for me to check. With the SMP kernel it did seem to happen under heavy load like when we were recording two programs while at the same time running transcode on two programs. I'll see about getting better fans.
Well glad it's getting better. It sounds like it's hardware/heat related for sure.
