Hi,


Are there other events (not system calls) that initiate a switch to secondary 
mode?

exceptions (CPU exceptions, e.g. page faults). I presume, you have
done mlockall(CURRENT | FUTURE), haven't you?

As a starting point, take a look at what /proc/xenomai/faults provides.

Moreover, enable "Nucleus debugging support" in your kernel config. If
it's an exception indeed, you would see a message like :

"Switching %s to secondary mode after exception #%u from "
                            "user-space at 0x%lx (pid %d)\n"

with proper parameters, of course.


--
Best regards,
Dmitry Adamushko

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