On 31 Oct 2007 at 22:46, Brian Kroth wrote:

> but not ever (yet) with this
> 
> cactid --verbosity=5 -f 1 -l 10

what does the -l switch do?

> The version of cactid in portage is slightly old.  After updating from 
> 0.8.6i-r1 to 0.8.6j the problem seems to happen less frequently, but 
> still happens.  With that in mind might this actually be a software 
> problem and not a kernel problem?  Shouldn't PAX be preventing userland 
> software from screwing up the page table?

i'm almost sure it's a bug somewhere in vma mirroring as that's the
only thing i changed in .22 and on and it does play with page locking
(the bad page state is triggered because a to-be-freed page is still
locked, that's means there's a missing unlock somewhere in the code,
but i couldn't figure it out from the code yet).

> I can send more kernel output if anyone's interested.  Any thoughts on 
> what else I should be doing to test this?

i'll need your mm/memory.o from the failing kernel and if it occured on
multiple machines or kernels, indicate which of your report corresponds
to which .o (well, i can find it out from the disasm eventually, but it
helps me if i don't have to ;-). then can you send me a /proc/pid/maps file
from cactid and nagios (if you use grsec make sure that addresses are not
hidden and preferably not randomized either)?

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