Re: Userspace process crashes with PREEMPT

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From: Mikulas Patocka <mikulas@xxxxxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 31 May 2008 11:02:38 +0200 (CEST)

> Hi
> 
> I have an Ultra 5 (360MHz, 256MB) with kernel 2.6.25.4 and I see userspace 
> process crashes when I run kernel compiled with preempt. The crashes 
> happen once in few hours, a good test for them is to compile kernel in a 
> loop --- the crashes happen in cc1 or as.

Thanks for the report, I remember you mentioning this at
LinuxTAG the other day.

> BTW. I saw another problem --- when I compile kernel with 64kB pages, it 
> crashes on load (it doesn't even switch to Linux console) ... is it known 
> problem?

It's known to be broken.  I simply suggest that people not try
to use such esoteric features until I have a lot of time to
try and either make them work or remove them.
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