> I found Linux hangs when printk is inserted to the function schedule().
> Sure, it doesn't make much sense to add such a line to schedule(). But Linux
> shouldn't hang anyway, right? It's assumed that printk can be inserted
> safely to anywhere. So, is it a bug of Linux?
Its a known deadlock in 2.4:
schedule -> printk() -> dmesg output -> klogd wakes up -> repeat
It is not a hard fix and its basically one of a few places where you
cannot call printk(), which is otherwise a very robust funciton.
Robert Love
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