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Subjectlinux hangs with printk on schedule()
Date
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?

The linux I am running is 2.4.18-14, the same version used by Redhat 8.0.
The scheduler is Ingo's O(1) scheduler.


Here is a fragment of the code
****************************************************************
switch (prev->state) {
------
default:
printk("deactivating task pid=%d
comm=%s\n",prev->pid,prev->comm);
deactivate_task(prev, rq);
}
******************************************************************

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