[Bug nptl/16125] New: Issue with glibc lock elision implementation for Haswell CPU

[Bug nptl/16125] New: Issue with glibc lock elision implementation for Haswell CPU

[alphazo at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16125

            Bug ID: 16125
           Summary: Issue with glibc lock elision implementation for
                    Haswell CPU
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: alphazo at gmail dot com
                CC: drepper.fsp at gmail dot com

Created attachment 7268
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7268&action=edit
Kdenlive BT

I just installed ArchLinux on a brand new Intel i7 4770S (Haswell) because my
old laptop was unable to handle HD content properly under Kdenlive. I have the
exact package versions on both machines but when disabling a simple effect in
Kdenlive I get a seg fault on the new machine.

You can see my bug report on Kdenlive bug tracker here:
http://www.kdenlive.org/mantis/view.php?id=3186

and ArchLinux bug tracker there: 
https://bugs.archlinux.org/task/37617 

I looked at the trace and found this stuff about lock elision that seems very
(hardware) specific to Haswell CPU.

I looked at the PKGBUILD for the pre-compiled glibc 2.18-9 that ships with
ArchLinux and it has the "--enable-lock-elision" switch so I used ABS to
recompile it without this switch. And yes problem is gone.

Is this a problem with Kdenlive code or lock elision implementation in current
glibc when ran on Haswell processors ? Don't know if this is related but I also
had some repetive issues with Digikam when using the default glibc.

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[Bug nptl/16125] Issue with glibc lock elision implementation for Haswell CPU

[allan at archlinux dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16125

Allan McRae <allan at archlinux dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |allan at archlinux dot org

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[Bug nptl/16125] Issue with glibc lock elision implementation for Haswell CPU

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16125

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
This is the sort of thing that can't readily be debugged from a standalone bug
report as it depends heavily on the specific environment in which libc is used.
 Please work with the libc-help@sourceware.org list on debugging it.

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[Bug nptl/16125] Issue with glibc lock elision implementation for Haswell CPU

[allan at archlinux dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16125

Allan McRae <allan at archlinux dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Allan McRae <allan at archlinux dot org> ---
Marking this as an upstream issue:

http://www.kdenlive.org/mantis/view.php?id=3186

http://quickgit.kde.org/?p=kdenlive.git&a=commitdiff&h=d049b327afc02b499266b5c895b13e438490b7c0&o=plain

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[Bug nptl/16125] Issue with glibc lock elision implementation for Haswell CPU

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16125

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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