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    SubjectRe: [PATCH] ARM: futex: fix clobbering oldval
    Hi Jon,

    On Tue, Dec 06, 2011 at 06:58:34PM +0000, Jon Masters wrote:
    > On Thu, 2011-09-22 at 18:26 +0100, Will Deacon wrote:
    > > Hi,
    > >
    > > On Thu, Sep 22, 2011 at 03:53:35AM +0100, mhban wrote:
    > > > This patch fixes clobbering oldval bug. oldval should be preserved for next
    > > > compare operation.
    > > >
    > > > Change-Id: I2a63bc1bdb8de330eb9e1ac02d7da1f77e6e8c3c
    > > > Signed-off-by: Minho Ban <mhban@samsung.com>
    > >
    > > It would have been nice to have been CC'd on this...
    > >
    > > I ran LTP tests on this, so I'm surprised that this was broken (the tests
    > > passed). Well spotted anyway!
    >
    > This appears to be the cause of our "stuck builder" problem in Fedora
    > building certain large packages, such as OpenJDK. Some of our guys are
    > still monitoring the situation in case there's a secondary issue.
    >
    > Was there ever any additional followup on this topic?

    Yup, check commit df77abca ("ARM: 7099/1: futex: preserve oldval in SMP
    __futex_atomic_op"). It should be in stable for all affected kernels too.

    Cheers,

    Will


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