Tomas Kalibera wrote:
 > Hi Gilles,
 > thanks for looking at it. Your analysis is correct, I don't indeed have 
 > CONFIG_PREEMPT_RT kernel, but only CONFIG_PREEMPT, sorry for the confusion.
 > I've put the kernel config, sources, and binary on the web, so that you 
 > can be sure you're really looking on the kernel that is crashing, 

It looks like do_wp_page, the caller of cow_user_page calls it with
spinlock unlocked. So nothing prevents a rescheduling to happen and
reschedule a real-time process, which can call fork. Now, I wonder what
prevents do_wp_page to be called in the same conditions...



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