Re: printks in the scheduler freeze during scripts

From: Andrew Morton (
Date: Thu Jun 27 2002 - 09:15:51 EST

anton wilson wrote:
> I'm running linux 2.4.17 and Redhat 7.2 with the preemptive and low latency
> patches, and whenever I stick printks in the scheduler(void) my system
> freezes somewhere after it tries to load the system font. Where it stops
> seems to be random. I can only run under single user mode without my system
> freezing. Does anyone have any clues why? Or any better ways to go about
> tracking the scheduling of processes in the scheduler?

printk() calls wake_up(), to give klogd a kick. So a printk
from the scheduler tends to deadlock. Just delete the
last two lines of kernel/printk.c:release_console_sem() and it
should work OK.
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