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    SubjectRe: 2.6.17-rc5-mm1
    Robert Hancock wrote:
    > Martin Bligh wrote:
    >>> We have to get to the bottom of this - there's a shadow over about 500
    >>> patches and we don't know which.
    >>> iirc I tried to reproduce this a couple of weeks back and failed.
    >>> Are you able to narrow it down to a particular LTP test? It was
    >>> mtest01 or
    >>> something like that? Perhaps we can identify a particular command line
    >>> which triggers the fault in a standalone fashion?
    >> The LTP output is here:
    >> The last test run was memset01
    >> From a good test run
    >> (
    >> the one after memset01 is a second instance of the same.
    >> Which is bad I suppose, in that it's likely an intermittent failure.
    >> Perhaps you can try running memset01 in a loop? I don't have such a
    >> box set up here right now, I'm afraid ... will see what I can do.
    >> OTOH, it looks like this might be a different failure than the double
    >> fault we saw in previous -mm's, which was consistently in mtest01, IIRC.
    > As a shot in the dark, I've seen problems on my Athlon 64 box with a
    > program that does memset on a huge chunk of memory repeatedly which
    > causes the machine to panic in various ways, lock up or reboot. Is this
    > what that test is doing? I suspect my problem is caused by a AMD Athlon
    > 64/Opteron CPU erratum 97 "128-Bit Streaming Stores May Cause Coherency
    > Failure". The Newcastle CPU I have has this bug which can cause loss of
    > coherency on non-temporal stores, which the glibc memset function uses.
    > The BIOS is supposed to apply a workaround but I've no way of knowing if
    > mine (Asus A8N-SLI Deluxe) is..
    > And no it's not a memory problem, the system passes memtest86 overnight
    > without error. The problem usually shows up within a minute of starting
    > the continuous-memset program..

    All sounds very sensible ... but not sure why -mm would hit it all the
    time, and never mainline ...


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