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    SubjectRe: PROBLEM: memory corrupting bug, bisected to 6dda9d55

    On Mon, 11 Oct 2010 15:30:22 +0100
    Mel Gorman <> wrote:

    > On Sat, Oct 09, 2010 at 04:57:18AM -0500, wrote:
    > > (What a big Cc: list... scripts/ made me do it.)
    > >
    > > This will be a long story with a weak conclusion, sorry about that, but it's
    > > been a long bug-hunt.
    > >
    > > With recent kernels I've seen a bug that appears to corrupt random 4-byte
    > > chunks of memory. It's not easy to reproduce. It seems to happen only once
    > > per boot, pretty quickly after userspace has gotten started, and sometimes it
    > > doesn't happen at all.
    > >
    > A corruption of 4 bytes could be consistent with a pointer value being
    > written to an incorrect location.

    It's corruption of user memory, which is unusual. I'd be wondering if
    there was a pre-existing bug which 6dda9d55bf545013597 has exposed -
    previously the corruption was hitting something harmless. Something
    like a missed CPU cache writeback or invalidate operation.

    How sensitive/vulnerable is PPC32 to such things?

     \ /
      Last update: 2010-10-11 23:05    [W:0.023 / U:111.508 seconds]
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