After update from glibc-2.29-r2 to glibc-2.29-r7 some programs start crashing after a fork from processes launched before update (thus linked with old glibc). Restart of these processes or system reboot fixes this issue. I ran into this at least on two different systems. All my systems already rebooted, so I no longer able to reproduce. Some examples: autocompletion in bash: $ scp tm*** stack smashing detected ***: <unknown> terminated p/ dante socks proxy: ... sockd[577]: *** stack smashing detected ***: <unknown> terminated sockd[577]: Dec 11 02:31:41 (1576020701.916460) sockd[577]: warning: EOF from negotiate-child 506234 sockd[577]: Dec 11 02:31:41 (1576020701.916593) sockd[577]: warning: sigchld(): negotiate-child 506234 exited unexpectedly on signal SIGABRT sockd[577]: *** stack smashing detected ***: <unknown> terminated sockd[577]: Dec 11 02:31:46 (1576020706.434433) sockd[577]: warning: EOF from negotiate-child 655231 sockd[577]: Dec 11 02:31:46 (1576020706.434590) sockd[577]: warning: sigchld(): negotiate-child 655231 exited unexpectedly on signal SIGABRT ... $ emerge --info glibc Portage 2.3.79 (python 3.6.9-final-0, default/linux/amd64/17.1, gcc-9.2.0, glibc-2.29-r7, 4.19.88-gentoo x86_64) ================================================================= System Settings ================================================================= System uname: Linux-4.19.88-gentoo-x86_64-Intel-R-_Core-TM-_i5_CPU_660_@_3.33GHz-with-gentoo-2.6 KiB Mem: 8021036 total, 745612 free KiB Swap: 8388604 total, 8251900 free Timestamp of repository gentoo: Tue, 10 Dec 2019 22:00:01 +0000 Head commit of repository gentoo: 2f6487cbe8408792dfb391362b29443630915554 Head commit of repository puleglot: c4622a5f445d25a2c0bd4dbb8fa436abfe819700 sh dash 0.5.9.1-r3 ld GNU ld (Gentoo 2.32 p2) 2.32.0 distcc 3.3.3 x86_64-pc-linux-gnu [disabled] app-shells/bash: 4.4_p23-r1::gentoo dev-java/java-config: 2.2.0-r4::gentoo dev-lang/perl: 5.30.1::gentoo dev-lang/python: 2.7.16::gentoo, 3.6.9::gentoo dev-util/cmake: 3.14.6::gentoo sys-apps/baselayout: 2.6-r1::gentoo sys-apps/sandbox: 2.13::gentoo sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r4::gentoo sys-devel/automake: 1.13.4-r2::gentoo, 1.16.1-r1::gentoo sys-devel/binutils: 2.32-r1::gentoo sys-devel/gcc: 9.2.0-r2::gentoo sys-devel/gcc-config: 2.1::gentoo sys-devel/libtool: 2.4.6-r3::gentoo sys-devel/make: 4.2.1-r4::gentoo sys-kernel/linux-headers: 4.19::gentoo (virtual/os-headers) sys-libs/glibc: 2.29-r7::gentoo Repositories: gentoo location: /var/db/repos/gentoo sync-type: rsync sync-uri: rsync://10.8.10.1/gentoo-portage priority: -1000 sync-rsync-verify-metamanifest: yes sync-rsync-verify-max-age: 24 sync-rsync-extra-opts: sync-rsync-verify-jobs: 2 crossdev location: /var/db/repos/crossdev masters: gentoo priority: 100 puleglot location: /var/db/repos/puleglot sync-type: git sync-uri: https://puleglot.ru/git/gentoo/puleglot-overlay.git masters: gentoo priority: 900 local location: /usr/local/portage masters: gentoo priority: 1000 Installed sets: @devel ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="@FREE" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -march=core2 -mtune=core2 -pipe" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/easy-rsa /usr/share/gnupg/qualified.txt" 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 /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -march=core2 -mtune=core2 -pipe" DISTDIR="/var/cache/distfiles" EMERGE_DEFAULT_OPTS="--dynamic-deps=n --with-bdeps=y --binpkg-respect-use=y --ask-enter-invalid" ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR" FCFLAGS="-O2 -march=core2 -mtune=core2 -pipe" FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs buildpkg cgroup clean-logs compress-build-logs config-protect-if-modified distlocks ebuild-locks fixlafiles ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned sandbox sfperms split-log strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr" FFLAGS="-O2 -march=core2 -mtune=core2 -pipe" GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles/ http://distfiles.gentoo.org/" LANG="ru_RU.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j2" PKGDIR="/var/cache/binpkgs" 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 acl acpi aio alsa amd64 amr ape asyncns avahi bash-completion berkdb bluetooth bluray branding bzip2 cairo caps cdda cddb cdparanoia cdr cli colord crypt cryptsetup cups cxx dbus dconf device-mapper djvu dri dts dvd dvdr eds egl evo exif faac faad ffmpeg flac fontconfig fortran fuse gdbm gif gnome gnome-keyring gnome-online-accounts gpm gstreamer gtk gtk3 hardened iconv icu idn ieee1394 introspection ipv6 jpeg jpeg2k lcms libass libnotify libsecret libtirpc lz4 lzma mac maildir mms mp3 mp4 multilib musepack musicbrainz nautilus ncurses networkmanager nls nptl ogg opengl openmp opus pam pcre perl pie png policykit postscript pulseaudio python raw readline samba sasl seccomp speex spell split-usr ssl ssp startup-notification svg systemd theora tiff tls truetype udev unicode upnp-av urandom usb vaapi vdpau vim-syntax vorbis vpx wavpack wayland webp x264 xattr xfs xtpax xv xvid xz zeroconf zlib zstd" ABI_X86="64" ADA_TARGET="gnat_2018" 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" APACHE2_MPMS="prefork" CALLIGRA_FEATURES="karbon sheets words" CAMERAS="*" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2 sse3 ssse3 sse4_1" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" GRUB_PLATFORMS="efi-64 pc" INPUT_DEVICES="evdev libinput" KERNEL="linux" L10N="en ru" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" NETBEANS_MODULES="apisupport cnd groovy gsf harness ide identity j2ee java mobility nb php profiler soa visualweb webcommon websvccommon xml" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_6" PYTHON_TARGETS="python2_7 python3_6" QEMU_SOFTMMU_TARGETS="aarch64 arm i386 mips mips64 mips64el mipsel x86_64" QEMU_USER_TARGETS="aarch64 arm" RUBY_TARGETS="ruby24 ruby25" USERLAND="GNU" VIDEO_CARDS="amdgpu radeon radeonsi intel vesa mga" 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, INSTALL_MASK, LC_ALL, LINGUAS, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS ================================================================= Package Settings ================================================================= sys-libs/glibc-2.29-r7::gentoo was built with the following: USE="caps multiarch (multilib) (ssp) -audit (-cet) -compile-locales -doc -gd -headers-only -nscd (-profile) (-selinux) -suid -systemtap -test (-vanilla)" ABI_X86="(64)" CFLAGS="-march=core2 -mtune=core2 -pipe -O2 -fno-strict-aliasing" CXXFLAGS="-march=core2 -mtune=core2 -pipe -O2 -fno-strict-aliasing" FEATURES="multilib-strict distlocks usersync config-protect-if-modified strict unmerge-orphans xattr protect-owned news buildpkg userpriv pid-sandbox assume-digests sandbox compress-build-logs network-sandbox unknown-features-warn ipc-sandbox cgroup binpkg-dostrip fixlafiles parallel-fetch clean-logs binpkg-docompress merge-sync sfperms split-log ebuild-locks userfetch binpkg-logs preserve-libs usersandbox unmerge-logs"
We'll need a backtrace or a step-by-step reproducer to get the idea why crashes started happening. They might either be application errors that fail to handle errors that come from libc (if resolver changed on disk for example) or some genuine glibc bug (of a new or an old version).
