what does this mean?

[Steve Iribarne (GMail)]

My code is hitting in sched.c ->

        if (unlikely(in_interrupt())) {
                printk("Scheduling in interrupt\n");
                BUG();
        }
It is hitting this printk.  So is this telling me I'm calling schedule
from within an interrupt?  How can this be?  Has anyone else seen
something like this and can anyone give me a hint as to what to look
for.

Thanks.
-stv