[Bugs] [Bug 1369042] thread CPU saturation limiting throughput on write workloads

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1369042



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: http://review.gluster.org/15233 committed in release-3.8 by Pranith
Kumar Karampuri (pkarampu at redhat.com) 
------
commit 036c4fcab82d4e69bf3e53d93f7da9b0b1dd900c
Author: Pranith Kumar K <pkarampu at redhat.com>
Date:   Tue Aug 2 15:19:00 2016 +0530

    cluster/afr: copy loc before passing to syncop

    Problem:
    When io-threads is enabled on the client side, io-threads destroys the
    call-stub in which the loc is stored as soon as the c-stack unwinds.
    Because afr is creating a syncop with the address of loc passed in
    setxattr by the time syncop tries to access it, io-threads would have
    already freed the call-stub. This will lead to crash.

    Fix:
    Copy loc to frame->local and use it's address.

    > Reviewed-on: http://review.gluster.org/15070
    > CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    > Smoke: Gluster Build System <jenkins at build.gluster.org>
    > NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    > Reviewed-by: Ravishankar N <ravishankar at redhat.com>

    BUG: 1369042
    Change-Id: I16987e491e24b0b4e3d868a6968e802e47c77f7a
    Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
    Signed-off-by: Oleksandr Natalenko <oleksandr at natalenko.name>
    Reviewed-on: http://review.gluster.org/15233
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Ravishankar N <ravishankar at redhat.com>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>

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