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[Launchpad Bug Tracker <1642390@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package glibc - 2.24-7ubuntu2

---------------
glibc (2.24-7ubuntu2) zesty; urgency=medium

  * Disable lock-elision on all targets to avoid regressions (LP:
#1642390)

glibc (2.24-7ubuntu1) zesty; urgency=medium

  * Merge with 2.24 from Debian sid, with upstream and packaging
updates.

glibc (2.24-7) unstable; urgency=medium

  [ Samuel Thibault ]
  * hurd-i386/tg-hurdsig-SA_SIGINFO.diff: Fix passing address to legacy SIGBUS
    handlers.
  * hurd-i386/tg-libpthread-gsync-mutex.diff: New patch to make mutexes use
    gsync too.
  * hurd-i386/tg-NOFOLLOW.diff: New patch to fix O_NOFOLLOW errors.
  * hurd-i386/tg-NOFOLLOW-DIRECTORY.diff: New patch to fix O_NOFOLLOW |
    O_DIRECTORY errors.

  [ Aurelien Jarno ]
  * debian/patches/git-updates.diff: update from upstream stable branch.
  * debian/rules: build with -no-pie -fno-PIE. Closes: #845512, #845521.

  [ Matthias Klose ]
  * Allow to inject the libc-dev dependency on linux-libc-dev by the build
    environment.

glibc (2.24-6) unstable; urgency=medium

  [ Samuel Thibault ]
  * libc0.3.symbols.hurd-i386: Drop removed RPCs.
  * hurd-i386/cvs-libpthread.diff: Update to latest upstream version.
    - hurd-i386/cvs-libpthread-static-weak.diff: Drop, merged upstream.
    - hurd-i386/cvs-pthread-atfork.diff: Drop, merged upstream.
    - hurd-i386/cvs-setcancelstate.diff: Drop, merged upstream.
  * hurd-i386/tg-libpthread-gsync-spin.diff: New patch to make spinlocks use
    gsync too.  Thanks Svante Signell for investigating issues with the first
    version.
  * hurd-i386/tg-ONSTACK.diff: New patch to fix SS_ONSTACK support.
    Closes: #551470.
  * hurd-i386/tg-extern_inline.diff: Update to upstream.
    - hurd-i386/tg-sigstate_thread_reference.diff: Refresh.
    - hurd-i386/tg-gsync-libc.diff: Refresh.
  * hurd-i386/tg-hurdsig-SA_SIGINFO.diff: Update to upstream.
  * hurd-i386/tg-EGREGIOUS-fr.diff: New patch to fix grammar in french
    translation.

  [ Aurelien Jarno ]
  * debian/patches/git-updates.diff: update from upstream stable branch:
    - Fix pread/pwrite syscalls on SH4.
    - Fix build on powerpc/ppc64el with binutils from trunk.  Closes: #843691.
    - Fix flexible array usage in gconv.h.  Closes: #841304.
    - Fix linknamespace parallel test failures.  Closes: #844132.
  * debian/patches/any/submitted-unicode-9.0.0.diff: proposed patch to update
    Unicode support to version 9.0.0.  Closes: #842466.
  * debian/patches/localedata/locale-C.diff: update to Unicode 9.0.0.
  * debian/patches/localedata/submitted-en_AU-date_fmt.diff: improve date_fmt
    for en_AU locale.  Closes: #841916.

glibc (2.24-5) unstable; urgency=medium

  [ Aurelien Jarno ]
  * debian/sysdeps/linux.mk: fix cross-compilation by also looking at headers
    in $(LINUX_HEADERS).
  * debian/testsuite-xfail-debian.mk: allow nptl/tst-stack4 to fail on HPPA.

  [ Samuel Thibault ]
  * hurd-i386/cvs-libpthread-static-weak.diff: New patch to fix weak
    references when linking in libpthread statically.
  * hurd-i386/cvs-pthread-atfork.diff: New patch to fix unregistering atfork
    handlers at library unload. Closes: #841068.
  * debhelper.in/libc-dev.install.hurd-i386: Install libpthread_nonshared.a.

glibc (2.24-4) unstable; urgency=medium

  [ Samuel Thibault ]
  * hurd-i386/tg-hurdsig-SA_SIGINFO.diff: Fix preemptors and thus
    hurd_safe_*.
  * hurd-i386/tg-hurdsig-fixes.diff: Fix uninitialized value.
  * hurd-i386/submitted-exec_filename.diff: Add missing includes, fix const
    warning.
  * hurd-i386/cvs-mallocfork.diff: New patch to fix concurrency between
    hurd_malloc and fork, triggered by malloc/tst-malloc-fork-deadlock.
  * hurd-i386/cvs-libpthread.diff: Update to latest upstream version.
    Closes: #839742.
  * hurd-i386/libpthread_build.diff: Refresh.
  * hurd-i386/libpthread_version.diff: Refresh.
  * hurd-i386/unsubmitted-libc_alloca_cutoff.diff: Refresh.
  * hurd-i386/cvs-hidden.diff: Drop, merged upstream.
  * hurd-i386/cvs-libpthread-2.23.diff: Drop, merged upstream.
  * hurd-i386/cvs-libpthread-api.diff: Drop, merged upstream.
  * hurd-i386/cvs-libpthread_build.diff: Drop, merged upstream.
  * hurd-i386/cvs-libpthread_clean2.diff: Drop, merged upstream.
  * hurd-i386/cvs-pt-kill.diff: Drop, merged upstream.
  * hurd-i386/libpthread-versions.diff: Drop, merged upstream.
  * hurd-i386/libpthread_clean.diff: Drop, merged upstream.
  * hurd-i386/libpthread_sigmask.diff: Drop, merged upstream.
  * hurd-i386/libpthread_spin-lock.diff: Drop, merged upstream.
  * hurd-i386/unsubmitted-libpthread-semaphore.h.diff: Drop, merged upstream.
  * hurd-i386/tg-pthread_deps.diff: New patch, fixes references to libc
    symbols.
  * testsuite-xfail-debian.mk: Clear fixed hurd-i386 test.
  * control: Drop hurd dependency from libc-bin: the reason for the dep has
    disappeared.
  * hurd-i386/unsubmitted-libc_alloca_cutoff.diff: Rename to
    hurd-i386/tg-allocalim.diff.
  * hurd-i386/unsubmitted-timer_routines.diff: Rename to
    hurd-i386/tg-timer_routines.diff.
  * hurd-i386/tg-glibc-2.24-restore-malloc-hook.diff: Restore malloc_hook for
    now for mach-defpager.
  * hurd-i386/cvs-setcancelstate.diff: New patch to work around a bug with
    newer libpthread snapshot.

  [ Adam Conrad ]
  * debian/rules.d/tarball.mk: Apply --no-renames to make the diff readable.
  * debian/rules.d/tarball.mk: Avoid filterdiff bugs with git pathspec magic.
  * debian/patches/git-updates.diff: Update to 2.24 master to test the above.

  [ John David Anglin ]
  * debian/patches/hppa/cvs-atomic-machine.diff: New patch from upstream to
    fix nptl/tst-stack4 on hppa.  Closes: #838574.

  [ Aurelien Jarno ]
  * debian/sysdeps/linux.mk: Install both kernel and library headers symlinks
    using a single for loop.
  * debian/sysdeps/linux.mk: Also install a /usr/include/<triplet>/arch
    symlink if it exists, needed for the tilegx architecture.
  * debian/control.in/main: add a dependency on lsb-base (>= 3.0-6) for ncsd.
  * debian/debhelper.in/nscd.init: also invalidate services and netgroup
    during reload.  Closes: #793649.
  * debian/control.in/main, debian/rules.d/debhelper.mk: install nscd systemd
    files. Closes: #767707.
  * debian/patches/localedata/locale-C.diff: switch back transliterations to
    combining.  Closes: #840199.
  * debian/debhelper.in/locales.postinst: improve locales-all detection.
    Closes: #840901.
  * debian/patches/i386/local-cpuid-level2.diff: replace by upstream patch
    cvs-cpuid-level2.diff.
  * debian/control.in/main: slightly relax the build-dependency on g++-6 to
    make lintian happy.

 -- Adam Conrad <adconrad@xxxxxxxxxx>  Mon, 05 Dec 2016 05:36:48 -0700

** Changed in: glibc (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1642390

Title:
  Disable lock-elision in glibc pending upstream changes

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Xenial:
  Fix Released
Status in glibc source package in Yakkety:
  Fix Released

Bug description:
  [ SRU Justification ]
  A long thread on debian-devel[1] has pointed out that hardware lock elision behaves differently (arguably, more correctly) in the face of incorrect pthread usage, especially where double-unlocks are concerned.  While this isn't itself a bug, it's quite true that we have no way of knowing right now just how many third party sources are buggy, and as people are upgrading to hardware that supports this feature, more software may crash in the future.

  The long-term goal should be to try to ferret out all the bad actors
  here, fix them, and re-enable hardware lock elision as the default,
  but the sane conservative choice seems to be to just disable the
  feature entirely for now, while we (the glibc upstream community) work
  on making lock elision a per-process opt-in.

  [1] https://lists.debian.org/debian-devel/2016/11/msg00210.html

  [ Proposed Fix ]
  This SRU will disable lock elision entirely, thus avoiding the problematic codepaths.  A future SRU will re-enable building those codepaths, but in such a way that they're disabled by default with a per-process environment twiddle to enable it on demand.

  [ Regression Potential ]
  There's a potential for performance regressions, however given that most x86 users are only just now upgrading to hardware that supports this feature, the status quo is that this codepath is dead to most users.  As for s390x and PPC, we've had requests to disable lock elision by default on both arches (entirely on s390x, conditionally on PPC), and those requests will be somewhat satisfied by this SRU, and cleaned up in the future SRU where we integrate the upstream-concensus patch to allow it to be conditionally re-enabled.

  [ Testing ]
  autopkgtest regressions will be our guide here on if this SRU is causing any issues.

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