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    SubjectRe: frequent lockups in 3.18rc4
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    On Tue, Nov 25, 2014 at 9:24 PM, Juergen Gross <jgross@suse.com> wrote:
    >
    > Working on it. Triggering it via sysrq(l) isn't working: machine hung
    > up. I'll try a dump, but this might take some time due to the machine
    > size...

    Actually, in that patch that did this:

    - pgd = pgd_offset(current->active_mm, address);
    + pgd = (pgd_t *)__va(read_cr3()) + pgd_index(address);

    make the code do:

    pgd = (pgd_t *)__va(read_cr3()) + pgd_index(address);
    WARN_ON(pdg != pgd_offset(current->active_mm, address));

    and now you should get a nice backtrace for exactly when it happens,
    but it's on a working kernel, so nothing will lock up.

    Hmm?

    And leave it running for a while, and see if the trace is always the
    same, or if there are variations on it...

    Thanks,

    Linus


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