After upgrade to glibc-2.21-r1, openrc's fstabinfo and mountinfo throw "double free or corruption" errors on my Thecus n1200 NAS. I was able to boil it down to a test case as shown below. Reproducible: Always Steps to Reproduce: cat > t.c <<EOF #include <mntent.h> int main(void) { FILE *fp = setmntent("/etc/fstab", "r"); getmntent(fp); endmntent(fp); } EOF gcc -o t t.c ./t Actual Results: *** Error in `./t': double free or corruption (!prev): 0x102e4008 *** ======= Backtrace: ========= /lib/libc.so.6[0xfe9c6b8] /lib/libc.so.6[0xfea3e3c] /lib/libc.so.6[0xfea4be8] /lib/libc.so.6(fclose+0x1f4)[0xfe8eea4] /lib/libc.so.6(endmntent+0x2c)[0xff08578] ./t[0x100004a4] /lib/libc.so.6[0xfe41938] /lib/libc.so.6[0xfe41ad8] ======= Memory map: ======== 00100000-00103000 r-xp 00000000 00:00 0 [vdso] 0fe20000-0ff84000 r-xp 00000000 08:01 7864443 /lib/libc-2.21.so 0ff84000-0ff9c000 ---p 00164000 08:01 7864443 /lib/libc-2.21.so 0ff9c000-0ffa0000 r--p 0016c000 08:01 7864443 /lib/libc-2.21.so 0ffa0000-0ffa1000 rw-p 00170000 08:01 7864443 /lib/libc-2.21.so 0ffa1000-0ffa4000 rw-p 00000000 00:00 0 0ffb0000-0ffd1000 r-xp 00000000 08:01 7864442 /lib/ld-2.21.so 0ffef000-0fff0000 r--p 0002f000 08:01 7864442 /lib/ld-2.21.so 0fff0000-0fff1000 rw-p 00030000 08:01 7864442 /lib/ld-2.21.so 10000000-10001000 r-xp 00000000 08:01 14418124 /home/michael/t 1001f000-10020000 r--p 0000f000 08:01 14418124 /home/michael/t 10020000-10021000 rw-p 00010000 08:01 14418124 /home/michael/t 102e4000-10305000 rwxp 00000000 00:00 0 [heap] b7cb1000-b7cb2000 rw-p 00000000 00:00 0 b7cb7000-b7cb9000 rw-p 00000000 00:00 0 bfaa3000-bfac4000 rw-p 00000000 00:00 0 [stack] Aborted - calling getmntent at least once is necessary to trigger the problem. My guess is that getmntent is actually corrupting something which is only detected on endmntent. - does not happen on arm or amd64. Corruption might still happen though but not be detected. - /var/log/rc.log backups show that it did not happen on previous reboots. - previous glibc version according to /var/log/emerge.log was 2.20-r2. emerge --info Portage 2.2.20.1 (python 3.4.3-final-0, default/linux/powerpc/ppc32/13.0, gcc-4.9.3, glibc-2.21-r1, 4.1.6 ppc) ================================================================= System uname: Linux-4.1.6-ppc-e300c1-with-gentoo-2.2 KiB Mem: 126580 total, 11148 free KiB Swap: 975532 total, 974296 free Timestamp of repository gentoo: Wed, 26 Aug 2015 18:30:01 +0000 sh bash 4.3_p39 ld GNU ld (Gentoo 2.25.1 p1.0) 2.25.1 distcc 3.2rc1 powerpc-unknown-linux-gnu [disabled] app-shells/bash: 4.3_p39::gentoo dev-lang/perl: 5.22.0::gentoo dev-lang/python: 2.7.10::gentoo, 3.4.3::gentoo dev-util/pkgconfig: 0.28-r3::gentoo sys-apps/baselayout: 2.2::gentoo sys-apps/openrc: 0.17::gentoo sys-apps/sandbox: 2.6-r1::gentoo sys-devel/autoconf: 2.13::gentoo, 2.69-r1::gentoo sys-devel/automake: 1.4_p6-r2::gentoo, 1.5-r2::gentoo, 1.6.3-r2::gentoo, 1.7.9-r3::gentoo, 1.9.6-r4::gentoo, 1.11.6-r1::gentoo, 1.14.1::gentoo, 1.15::gentoo sys-devel/binutils: 2.25.1::gentoo sys-devel/gcc: 4.9.3::gentoo sys-devel/gcc-config: 1.8::gentoo sys-devel/libtool: 2.4.6-r1::gentoo sys-devel/make: 4.1-r1::gentoo sys-kernel/linux-headers: 4.1::gentoo (virtual/os-headers) sys-libs/glibc: 2.21-r1::gentoo Repositories: gentoo location: /usr/portage sync-type: rsync sync-uri: rsync://rsync.gentoo.org/gentoo-portage priority: -1000 local-overlay location: /usr/local/portage masters: gentoo priority: 0 Installed sets: @system ACCEPT_KEYWORDS="ppc ~ppc" ACCEPT_LICENSE="* -@EULA" CBUILD="powerpc-unknown-linux-gnu" CFLAGS="-O2 -mcpu=603e -fno-strict-aliasing -pipe -fsigned-char" CHOST="powerpc-unknown-linux-gnu" CONFIG_PROTECT="/etc /etc/stunnel/stunnel.conf /usr/share/gnupg/qualified.txt" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -mcpu=603e -fno-strict-aliasing -pipe -fsigned-char" DISTDIR="/usr/portage/distfiles" EMERGE_DEFAULT_OPTS="--jobs=2 --load-average=4 --with-bdeps=y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs collision-protect 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" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="ftp://linux.rz.ruhr-uni-bochum.de/gentoo-mirror/ ftp://ftp.uni-erlangen.de/pub/mirrors/gentoo ftp://ftp.join.uni-muenster.de/pub/linux/distributions/gentoo ftp://ftp.wh2.tu-dresden.de/pub/mirrors/gentoo ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo" LANG="en_GB.UTF-8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" 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" PORTAGE_TMPDIR="/var/tmp" USE="bzip2 cracklib crypt cxx hardened iconv ipv6 kerberos mbox modules ncurses nptl nptlonly openssl pam pcre ppc readline recode ssl tcpd truetype unicode xinetd zlib" ABI_PPC="32" ALSA_CARDS="aoa aoa-fabric-layout aoa-onyx aoa-soundbus aoa-soundbus-i2s aoa-tas aoa-toonie powermac usb-audio via82xx" 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="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" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_4" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev glint mach64 mga nv r128 radeon savage tdfx trident dummy v4l" 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, MAKEOPTS, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
excellent test case. this was introduced by this upstream commit: https://sourceware.org/git/?p=glibc.git;a=commit;h=fb87ee96d7dd0714d52004e4676629f8d9db732f
pushed upstream for 2.23, and to the 2.22 and 2.21 branches pulled into Gentoo's 2.22 & 2.21 patchsets: http://sources.gentoo.org/gentoo/src/patchsets/glibc/2.21/00_all_0022-getmntent-fix-memory-corruption-w-blank-lines-BZ-188.patch?revision=1.1 http://sources.gentoo.org/gentoo/src/patchsets/glibc/2.22/00_all_0021-getmntent-fix-memory-corruption-w-blank-lines-BZ-188.patch?revision=1.1 and pushed in our 2.21-r1/2.22 ebuilds: http://gitweb.gentoo.org/repo/gentoo.git/commit/?id=68ff87d0a0bbe2d5794a0d8d6ac2f10b6ab438c2 no bump as it seems to only come up on a few systems. hopefully we get a security issue or something for 2.21 and revbump it then ;).
Awesome! Remerged glibc - problem gone. Thanks!
