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    SubjectRe: Allocation of too much memory hangs system, kernel 2.2.*
    On 1 Jun 1999, H. Peter Anvin wrote:

    > Followup to: <>
    > By author: Jost Boekemeier <jostobfe@calvados.zrz.TU-Berlin.DE>
    > In newsgroup:
    > >
    > > When the kernel runs out of vmem it starts to kill all runnable
    > > processes. One of its first victims are apache, init (sic!) and
    > > your shell. :)
    > >
    > Uh, no. init *can't* be killed.

    It is perhaps not possible to kill init, but the kernel can stop init from
    working (if it was actually killed or not ...). The effects I've seen is
    that all processes that die end up as zombies and shutdown/reboot/halt
    stop working.

    I don't remember if I reported it or not, since I thought the "OOM"
    problem was well known and left for future Linux versions.
    (there were a lot of "OOM killer patches" that Andrea et al threw at each
    other, around late 2.1.1xx :)

    Some old(?) version of postgresql didn't like a sql statement of mine and
    decided it needed lots of memory to optimize/parse it. That killed almost
    everything on the machine (2.2.0 or 2.2.0-preX), I telnet'ed back and
    there were zombies everywhere.
    I didn't save the logfiles either, if init was killed the oom() should
    have logged that.

    And just to be sure I re-ran the same sql after rebooting and again random
    processes were killed, but this time init was not killed/stopped/...

    mm/memory.c does, on a task failing to 'put_dirty_page'
    force_sig(SIGKILL, task);
    which (I think) leads to
    force_sig_info(sig, (void*)1L, p);
    return send_sig_info(sig, info, t);

    Then there is a permissions check with lots of && expressions, where
    info == 1L
    This part is then not true, so the operation is allowed
    (!info || ((unsigned long)info != 1 && SI_FROMUSER(info))

    And then I'm lost ... I can't find where the kernel is stopped from
    killing init.

    I suppose I should provide better debugging info by repeatedly killing a
    machine (with a recent 2.2 kernel) until I manage to hit init, if that is


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