linux-kernel - Mysterious RTC hangs on x86_64

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Date:	Wed, 02 May 2007 15:36:03 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Marcos Pinto <markybob@...il.com>, Andi Kleen <ak@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>
Subject: Mysterious RTC hangs on x86_64 - fixed, sort of

With this patch, /sbin/hwclock no longer hangs my AMD64 machine when run 
after reaching multiuser.  What I don't understand is why.  I have the 
RTC based sound sequencer timer as a module, but not loaded, and the 
error message I added to indicate broken rtc control does not fire.

So why is it that if I stop taking the rtc_task_lock and issuing the 
callbacks which should never be held or exist that my system no longer 
hard freezes?

Zach

View attachment "x86_64-rtc-mystery.patch" of type "text/x-patch" (810 bytes)

View attachment "rtc.config" of type "text/plain" (324 bytes)