On 2017-05-18 13:08:32 [+0200], Fawad Lateef wrote:

Hi Sebastian,

Hi Fawad,

quoted

Of this "page fault" happens on boot, it has to do something without
your .config + hw combination. If it happens at rune-time it is probably
triggered by a driver or an application is triggering this.

Yes, this happens at run-time and not always. Sometimes hardware just
hangs/stalls.

So this sounds like a race condition.

As now RT is widely used on ARM so to me seems like it something
related to hardware design/setting OR application.

Another question: Is RT user-space application can make kernel/system
crash? As to me kernel should kill the app but let itself running
_but_ not sure in the case of RT patched kernel.

This is correct. With RT or without it: a use space should not be able
to crash the kernel.
It is possible that a race within a driver triggers more reliably on RT.
I would recommend to strip down the system to the minimum where the
issue should not trigger. And then slowly increase the "enabled"
hardware components so you might get an idea when or what could cause
it.

Thanks,

Fawad Lateef

Sebastian