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From: "alphazo at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/16125] New: Issue with glibc lock elision implementation for Haswell CPU
Date: Tue, 05 Nov 2013 22:03:00 -0000
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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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