Created attachment 442226 [details] A perl script which fails to open a pipe. When attempting to run 'git difftool', I am getting the following error: $ git difftool -d Can't fork: Success at /usr/lib64/perl5/vendor_perl/5.20.2/Git.pm line 1587. I have narrowed down the problem to the fact that perl can't open a pipe for some reason. I've attached a test.pl script that demonstrates the problem on my system, yet works (as in it gives no error) on my Ubuntu laptop (where git difftool also works). This may or may not be related to another perl issue I'm having on the same system: https://bugs.gentoo.org/show_bug.cgi?id=589640 As mentioned in that bug, I have run perl-cleaner multiple times to no effect. My `emerge --info` output follows. Portage 2.2.28 (python 2.7.11-final-0, default/linux/amd64/13.0/desktop/plasma/systemd, gcc-4.9.3, glibc-2.22-r4, 4.5.2-gentoo x86_64) ================================================================= System uname: Linux-4.5.2-gentoo-x86_64-Intel-R-_Core-TM-_i7-4820K_CPU_@_3.70GHz-with-gentoo-2.2 KiB Mem: 49371492 total, 45481692 free KiB Swap: 4194300 total, 4194300 free Timestamp of repository gentoo: Thu, 28 Jul 2016 12:15:01 +0000 sh bash 4.3_p42-r1 ld GNU ld (Gentoo 2.25.1 p1.1) 2.25.1 distcc 3.2rc1 x86_64-pc-linux-gnu [disabled] ccache version 3.2.4 [disabled] app-shells/bash: 4.3_p42-r1::gentoo dev-java/java-config: 2.2.0-r3::gentoo dev-lang/perl: 5.20.2::gentoo dev-lang/python: 2.7.11-r2::gentoo, 3.4.3-r7::gentoo, 3.5.2::gentoo dev-util/ccache: 3.2.4::gentoo dev-util/cmake: 3.3.1-r1::gentoo dev-util/pkgconfig: 0.28-r2::gentoo sys-apps/baselayout: 2.2::gentoo sys-apps/openrc: 0.19.1::gentoo sys-apps/sandbox: 2.10-r1::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69::gentoo sys-devel/automake: 1.11.6-r1::gentoo, 1.12.6::gentoo, 1.14.1::gentoo, 1.15::gentoo sys-devel/binutils: 2.25.1-r1::gentoo sys-devel/gcc: 4.3.6-r1::gentoo, 4.7.4::gentoo, 4.8.5::gentoo, 4.9.3::gentoo, 5.3.0::gentoo sys-devel/gcc-config: 1.7.3::gentoo sys-devel/libtool: 2.4.6::gentoo sys-devel/make: 4.1-r1::gentoo sys-kernel/linux-headers: 4.6::gentoo (virtual/os-headers) sys-libs/glibc: 2.22-r4::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.namerica.gentoo.org/gentoo-portage priority: -1000 steam-overlay location: /var/lib/layman/steam-overlay masters: gentoo priority: 0 sunrise location: /var/lib/layman/sunrise masters: gentoo priority: 1 proaudio location: /var/lib/layman/proaudio masters: gentoo priority: 2 quarks location: /var/lib/layman/quarks masters: gentoo priority: 3 lostwoods location: /usr/local/portage/lostwoods masters: gentoo sunrise priority: 4 ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native -ggdb" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /var/lib/hsqldb /var/spool/munin-async/.ssh" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=native -ggdb" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildpkg 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="-O2 -pipe" GENTOO_MIRRORS="ftp://gentoo.mirrors.tds.net/gentoo http://gentoo.osuosl.org/ http://gentoo.mirrors.tds.net/gentoo http://mirrors.cs.wmich.edu/gentoo ftp://ftp.ussg.iu.edu/pub/linux/gentoo http://lug.mtu.edu/gentoo/ ftp://lug.mtu.edu/gentoo/" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j9" 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 --exclude=/.git" PORTAGE_TMPDIR="/var/tmp" USE="X a52 aac acpi aim amd64 bash-completion berkdb bluetooth bluray branding bzip2 cairo cdda cdr clamav cli cracklib crypt css cups cxx dbus declarative dri dts dvd dvdr emacs emboss encode evdev exif extras fam ffmpeg fftw firefox flac fontconfig fortran ftp gdbm gif glamor gnutls gpm gzip hddtemp iconv icq imap ipod ipv6 joystick jpeg jpeg2k kde kipi lcms ldap lib32 libnotify lm_sensors mad mmap mmx mmxext mng modules mp3 mp4 mpeg msn multilib mysql ncurses nls nptl ogg openal opengl openmp oscar pam pango pch pcre pdf phonon plasma png policykit posix ppds pulseaudio python qml qt3support qt4 qt5 raw rdesktop readline rss samba sdl seccomp semantic-desktop session sharedext sharedmem sockets spell sqlite sqlite3 sse sse2 ssl startup-notification static-libs subversion svg symlink systemd szip tcpd theora threads tiff truetype udev udisks unicode upower usb vdpau vnc vorbis wayland widgets win32codecs wxwidgets x264 xattr xcb xcomposite xinerama xml xscreensaver xv xvid yahoo zlib" ABI_X86="64" 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" 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" CPU_FLAGS_X86="aes avx mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3" DRACUT_MODULES="lvm" 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" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="en" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_5" RUBY_TARGETS="ruby20 ruby21" USERLAND="GNU" VIDEO_CARDS="nouveau nvidia" 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: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
It turned out it was related to #589640. I had enabled the "ithreads" use flag for perl for one of my projects, and it appears to be the source of the problems. Once I rebuilt without ithreads, both the test script and "git difftool" as expected.
