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Date: Thu, 27 Jun 2002 07:15:51 -0700
From: Andrew Morton <akpm@zip.com.au>
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To: anton wilson <anton.wilson@camotion.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: printks in the scheduler freeze during scripts
References: <200206271349.JAA16318@test-area.com>
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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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