Messages in this thread | | | Date | Tue, 6 Apr 2004 10:02:45 +0300 | From | Oleg Drokin <> | Subject | Re: [2.4] NMI WD detected lockup during page alloc |
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Hello!
On Tue, Apr 06, 2004 at 12:12:55AM +0200, Andrea Arcangeli wrote: > > In addition to what I have compiled in: > > # lsmod > > Module Size Used by Not tainted > > ppp_deflate 4568 1 (autoclean) > you may want to disable compression, this sounds like mm corruption and > compression isn't trivial to handle in kernel skbs (though I doubt this > is the problem but it's easy to disable).
Ok.
> > ipt_state 1016 4 (autoclean) > the hang while unloading this module may also be a sign of a bug in the > module so it would be nice if you could reproduce also w/o the above > ips_state.
Unfortunatelly this is not as easy to do, though I believe there is just some sort or race on unload that is not being hit until module is unloaded and therefore it is completely not related.
> If this still doesn't help then you can try to go UP again, SMP is > harder at stressing the memory bus and see if it stabilizes. Other thing > you can do is to remove half of the ram and see if it stabilizes to try > to identify buggy ram slots.
There I have ECC RAM, passed 14 days of memtest (yes, I know memtest uses only 1 CPU), so I do not think I have memory problems, though this is not absolute guarantee against that of course. Also running in UP mode for weeks is not all that funny and still proves nothing as I do not have clear way to reproduce it in certain time.
> Overall it's unlikely the oops is useful unfortunately since that piece > of the kernel is the most stressed ever, and it just signals random mm > corruption. I assume this is the first time you've got the nmi watchdog > oops, if you could get it again it would be more interesting, I'd expect > next time you would get it in another place.
Well, I had a hang before this oops and that was main reason I enabled NMI watchdog. At that first hang nothing get to serial console so I guessed it was similar spinlock deadlock. We'll see what I get when another NMI watchdog thing occurs. I run with spinlock debug this time, so hopefully if spinlock is really just corrupted, its magic would be corrupted as well and I get clear warning about that.
Thank you.
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