$ which notfound which: no notfound in (/opt/gentoo/usr/local/bin:/opt/gentoo/usr/bin:/opt/gentoo/bin:/opt/gentoo/opt/bin:/opt/gentoo/usr/sbin:/opt/gentoo/sbin:/opt/gentoo/usr/x86_64-apple-darwin13/gcc-bin/4.2.1:/usr/bin:/bin) $ notfound Segmentation fault: 11 $ export LC_ALL=C $ stillnotfound Segmentation fault: 11 $ definitionofmadness Segmentation fault: 11 $ /usr/bin/true # Ensure we're running an external command, not a shell builtin $ working -bash: working: command not found $ unset LC_ALL $ brokenagain Segmentation fault: 11 It appears that if the system language cannot be detected, then any attempt to execute a command which doesn't exist will result in bash issuing a "Segmentation fault: 11" message (although the invoking shell does not appear to be further affected). If LC_ALL is set, then there is no effect until a valid external binary *is* executed, at which point commands which aren't present will generate the appropriate message. The segfault message returns, though, as soon as LC_ALL is undefined. Setting LC_LANG (or other LC_* variables) seems to have no effect on the issue. The URL above has further discussion of this issue relating to the MacPorts build (so it's not just a Gentoo thing...)
Portage 2.2.8-prefix (prefix/darwin/macos/10.9/x64, gcc-4.2.1, unavailable, 13.1.0 x86_64) ================================================================= System uname: Darwin-13.1.0-x86_64-i386-64bit Timestamp of tree: Tue, 22 Apr 2014 18:06:40 +0000 app-shells/bash: 4.2_p45-r1 dev-lang/python: 2.7.5-r4::srcshelton dev-util/cmake: 2.8.12.2 dev-util/pkgconfig: 0.28-r1 sys-devel/autoconf: 2.69 sys-devel/automake: 1.14 sys-devel/gcc-config: 1.8-r00.1 sys-devel/libtool: 2.4.2 sys-devel/make: 4.0-r1 Repositories: gentoo_prefix timebomb_overlay srcshelton ACCEPT_KEYWORDS="amd64 amd64-linux x64-macos ~x64-macos" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-apple-darwin13" CFLAGS="-arch x86_64 -march=core-avx-i -mmacosx-version-min=10.9 -fcolor-diagnostics -ftrapv -O3 -pipe" CHOST="x86_64-apple-darwin13" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/terminfo" CXXFLAGS="-arch x86_64 -march=core-avx-i -mmacosx-version-min=10.9 -fcolor-diagnostics -ftrapv -O3 -pipe" DISTDIR="/opt/gentoo/usr/portage/distfiles" FCFLAGS="" FEATURES="assume-digests binpkg-logs buildpkg candy clean-logs collision-protect compress-build-logs compressdebug config-protect-if-modified distlocks downgrade-backup ebuild-locks fail-clean fixlafiles force-prefix merge-sync news nostrip parallel-fetch parallel-install preserve-libs protect-owned sfperms split-elog split-log splitdebug strict stricter unknown-features-warn unmerge-backup unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="" GENTOO_MIRRORS="http://distfiles.gentoo.org" LC_ALL="C" LDFLAGS="-Wl,-dead_strip_dylibs" MAKEOPTS="-j7" PKGDIR="/opt/gentoo/usr/portage/packages/clang" PORTAGE_CONFIGROOT="/opt/gentoo/" 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="/Volumes/Scratch/tmp" PORTDIR="/opt/gentoo/usr/portage" PORTDIR_OVERLAY="/opt/gentoo/usr/portage/local/timebomb /opt/gentoo/usr/portage/local/overlay" USE="aqua berkdb bzip2 clang coreaudio cracklib crypt cxx expat gdbm gmp iconv icu idn ipv6 libedit lzma lzo mmx mmxext modules mpfr ncurses nls objc objc++ pcre perl prefix python python2 readline sqlite sse sse2 ssl threads unicode x64-macos xml zlib" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd 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 author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="Darwin" 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" KERNEL="Darwin" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7" RUBY_TARGETS="ruby19 ruby20" 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" USE_PYTHON="2.7" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC
Recently there were updates in the MacPorts ticket regarding the cause being tracked down to the OS X implementation of gettext: > bash calls 'gettext' in the child process to print the 'command not found' error, and 'gettext' may call the function 'CFPreferencesCopyAppValue', which is not async-signal-safe. In particular, the bug happens if LC_ALL, LC_MESSAGES and LANG are all not set and 'gettext' is called for the first time in a child process (because otherwise CFPreferencesCopyAppValue is not called as the result is cached) I think that this gettext bug may also be the root cause of a tar bug that I've seen recently on OS X. tar fails when dealing with compressed archives when LC_ALL is unset: > % tar tjf foo.tar.bz2 > tar: Child died with signal 11 > tar: Error is not recoverable: exiting now
I'm going to assume this is fixed in recent editions of the systems, toolchains and software packages affected.
