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    SubjectRe: Kernel falls apart under light memory pressure (i.e. linking vmlinux)
    [cc linux-mm]

    On Thu, May 12, 2011 at 7:54 AM, Andrew Lutomirski <luto@mit.edu> wrote:
    > On Thu, May 12, 2011 at 1:46 AM, Andi Kleen <andi@firstfloor.org> wrote:
    >>> Here's a nice picture of alt-sysrq-m with lots of memory free but the
    >>> system mostly hung.  I can still switch VTs.
    >>
    >> Would rather need backtraces. Try setting up netconsole or crashdump
    >> first.
    >
    > Here are some logs for two different failure mores.
    >
    > incorrect_oom_kill.txt is an OOM kill when there was lots of available
    > swap to use.  AFAICT the kernel should not have OOM killed at all.
    >
    > stuck_xyz is when the system is wedged with plenty (~300MB) free
    > memory but no swap.  The sysrq files are self-explanatory.
    > stuck-sysrq-f.txt is after the others so that it won't have corrupted
    > the output.  After taking all that data, I waited awhile and started
    > getting soft lockup messges.
    >
    > I'm having trouble reproducing the "stuck" failure mode on my
    > lockdep-enabled kernel right now (the OOM kill is easy), so no lock
    > state trace.  But I got one yesterday and IIRC it showed a few tty
    > locks and either kworker or kcryptd holding (kqueue) and
    > ((&io->work)).
    >
    > I compressed the larger files.
    >
    > --Andy
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