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    SubjectRe: [2.6.36-rc regression] occasional complete system hangs on sparc64 SMP
    David Miller writes:
    > From: Mikael Pettersson <mikpe@it.uu.se>
    > Date: Sun, 3 Oct 2010 23:36:16 +0200
    >
    > > I've been testing older kernels and can now say that 2.6.35-git5
    > > and newer kernels are definitely affected, but 2.6.35-git4 seems
    > > solid. I'll dig deeper into the .35-git4->git5 changes towards
    > > the end of next week.
    > >
    > > I never got any data out of sysrq-y or any other sysrq when a hang
    > > occurs; usually they'd just print the name of the command but no data,
    > > sometimes they'd oops and crash the kernel even harder.
    >
    > So I haven't been ignoring this report, but I cannot reproduce
    > it on the SB2500 I have access to right now.
    >
    > I've been doing gcc builds and testsuite runs in a loop for
    > several days.
    >
    > Occaisionally I get a dying 'as' which I have seen before and
    > plan to investigate, but no hard hangs and no crashes.
    >
    > I'll keep prodding, but if you can narrow it down further
    > please let us know.

    I've looked at the .35-git4 to -git5 changes, and unfortunately
    they cannot be relevant for the sparc64 hangs: the bulk of the
    changes are x86-only, and the remaining few are totally harmless.

    So either .35-git4 is also broken, even though I haven't been
    able to break it after a week of gcc bootstraps and test runs,
    or some of the hangs I've seen in later kernels have been caused
    by some other bug. Either way, I don't think I can make progress
    bisecting & testing older kernels.


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