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TNorthover
Guru
Joined: 25 Jan 2004
Posts: 434
Location: Edinburgh, UK
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 Posted: Wed Nov 25, 2009 4:05 pm Post subject: Multi-core bus error |
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With a multi-core machine, I keep seeing "Bus Error" on various builds. Normally this would make me worry about my hardware, but it's consistent (only certain packages) and always fixable by using "-j1" on the build, and there are no problems with anything else. All this makes me think it's some issue like a file not being complete when read by another thread or something.
But it's still been nagging at my mind, so I'm wondering if anyone else encounters this? Or even better if someone has a precise explanation of why it's throwing a bus error rather than anything else. |
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tony-curtis
Tux's lil' helper
Joined: 20 May 2006
Posts: 111
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| Posted: Thu Nov 26, 2009 1:53 am Post subject: |
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Which packages in particular?
will answer questions about 32/64 bit, architecture etc. |
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Akkara
Bodhisattva
Joined: 28 Mar 2006
Posts: 6702
Location: &akkara
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| Posted: Thu Nov 26, 2009 2:02 am Post subject: |
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This is a bit of a wild guess here, but it might be a marginal power supply or components that have degraded over time (especially the capacitors in the Vcore regulator), or maybe just a loose connector or ram that needs re-seating. Compiling certain packages stresses the hardware more than others, and if voltages aren't to spec it may cause errors. Running -j1 uses only one core which limits the maximum load that's placed on the components.
Does it happen always at the exact same point while compiling those packages? Consistency will tend to rule out hardware issues. |
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TNorthover
Guru
Joined: 25 Jan 2004
Posts: 434
Location: Edinburgh, UK
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| Posted: Fri Nov 27, 2009 8:26 am Post subject: |
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So it seems it is just me. Hmm.
| Akkara wrote: | | This is a bit of a wild guess here, but it might be a marginal power supply or components that have degraded over time (especially the capacitors in the Vcore regulator), ir maybe just a loose connector or ram that needs re-seating. |
That's worth a shot, thanks.
| Quote: | | Does it happen always at the exact same point while compiling those packages? Consistency will tend to rule out hardware issues. |
It's not consistent within a build, but then concurrency issues would produce that too and I don't get the impression that it's limited to stressful packages.
| tony-curtis wrote: | | Which packages in particular? |
Parts of kde are favourite, but embarrassingly I can't think of one at the moment. Older versions of kdelibs used to trigger it but that seems to have been fixed.
I'd be surprised if there is a global solution beyond not using high -j, but "emerge --info" gives
| Code: | Portage 2.2_rc33 (default/linux/amd64/10.0/desktop, gcc-4.3.4, glibc-2.9_p20081201-r2, 2.6.31-gentoo-r1 x86_64)
=================================================================
System uname: Linux-2.6.31-gentoo-r1-x86_64-Intel-R-_Core-TM-_i7_CPU_940_@_2.93GHz-with-gentoo-1.12.13
Timestamp of tree: Fri, 27 Nov 2009 07:30:01 +0000
app-shells/bash: 4.0_p28
dev-java/java-config: 1.3.7-r1, 2.1.9-r1
dev-lang/python: 2.6.4, 3.1.1-r1
dev-python/pycrypto: 2.0.1-r8
dev-util/cmake: 2.6.4-r3
sys-apps/baselayout: 1.12.13
sys-apps/sandbox: 2.2
sys-devel/autoconf: 2.13, 2.63-r1
sys-devel/automake: 1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.2
sys-devel/binutils: 2.18-r3
sys-devel/gcc-config: 1.4.1
sys-devel/libtool: 2.2.6b
virtual/os-headers: 2.6.27-r2
ACCEPT_KEYWORDS="amd64"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -mtune=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/config"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /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 /etc/udev/rules.d"
CXXFLAGS="-march=native -mtune=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks fixpackages parallel-fetch preserve-libs protect-owned sandbox sfperms strict unmerge-orphans userfetch"
GENTOO_MIRRORS="http://gentoo.virginmedia.com/ http://www.mirrorservice.org/sites/www.ibiblio.org/gentoo/"
LANG="en_GB.UTF-8"
LC_ALL="en_GB.UTF-8"
LDFLAGS="-Wl,-O1"
LINGUAS="en_GB"
MAKEOPTS="-j9"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
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/portage/local/layman/kde-testing /usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac acl acpi alsa amd64 berkdb bluetooth branding bzip2 cairo cdr cli consolekit cracklib crypt cups dbus doc dri dts dvd dvdr eds emacs emboss encode evo fam firefox flac fortran gdbm gif gnome gpm gstreamer gtk hal iconv imap ipv6 jpeg kde latex ldap libnotify mad mikmod mmx modules mp3 mp4 mpeg mudflap multilib ncurses nls nptl nptlonly offensive ogg opengl openmp pam pcre pdf perl plasma png pni ppds pppd python qt3support qt4 quicktime readline reflection sdl session smp spell spl sqlite sse sse2 ssl ssse3 startup-notification svg sysfs tcpd threads thunar tiff truetype unicode usb vorbis x264 xft xml xorg xulrunner xv xvid zlib" 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" 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 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" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="en_GB" USERLAND="GNU" VIDEO_CARDS="nv vesa ati"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, FFLAGS, INSTALL_MASK, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS |
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Portage & Programming
