> Not known to me...
>
> Can you get any traces from the lockup? NMI watchdog or sysrq+p and +t?
>
> Did any previous 2.4.x work reliably?
I can confirm that it is not highmem related because today we had the same
lockup on 2.4.25 wo/highmem. Only thing left to be ruled out is grsec patch.
It will be tested soon and then I will inform you.
What is the status of megaraid2 driver? Is it safe to use it in production or
that isn't recommended?