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    SubjectRe: unaligned accesses in SLAB etc.
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    From: mroos@linux.ee
    Date: Wed, 15 Oct 2014 00:19:36 +0300 (EEST)

    >> > I'd like to know that your another problem is related to commit
    >> > bf0dea23a9c0 ("mm/slab: use percpu allocator for cpu cache"). So,
    >> > if the commit is reverted, your another problem is also gone
    >> > completely?
    >>
    >> The other problem has been present forever.
    >
    > Umm? I am afraid I have been describing it badly. This random
    > SIGBUS+SIGSEGV problem is new - I have not seen it before.

    Sorry, I thought it was the same bug that causes git corruptions
    for you. I misunderstood.

    > I have been able to do kernel compiles for years on sparc64 (modulo
    > specific bugs in specific configurations) and 3.17 + start/end swap
    > patch seems also stable for most machine. With yesterdays git + align
    > patch, it dies with SIGBUS multiple times during compilation so it's a
    > new regression for me.
    >
    > Will try reverting that commit tomorrow.

    If that fails, please try to bisect, it will help us a lot.

    > My only other current sparc64 problems that I am seeing - V210/V440 die
    > during bootup if compiled with gcc 4.9 and V480 dies with FATAL
    > exceptions during bootups since previous kernel release. Maybe also
    > exit_mmap warning - I do not know if they have been fixed, I see them
    > rarely.

    The gcc-4.9 case is interesting, are you saying that a gcc-4.9 compiled
    kernel works fine on other systems?


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