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Date:      Sun, 15 Nov 1998 09:33:11 -0800
From:      David Greenman <dg@root.com>
To:        Dennis <dennis@etinc.com>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: pmap_remove_pages problem 
Message-ID:  <199811151733.JAA03798@root.com>
In-Reply-To: Your message of "Sun, 15 Nov 1998 12:15:54 EST." <3.0.32.19981115121552.006cc944@etinc.com> 

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>Every few days I have a 2.2.7-RELEASE machine that panics in the
>pmap_remove_pages routing. Its usually in the middle of night when
>nothing is going on.
>
>When is this function called, and what might be the cause of the
>problem? Note that the same problem occurred in 2.2.6, so its not
>a bad kernel build.

   A stack traceback might be useful. pmap_remove_pages is called when a
process execs or exits in order to remove any and all pages in the process
address space. Panics in it often indicate damage to the physical to virtual
(pv) lists that happened sometime earlier, and is usually not related to the
events going on at the time. Usually the problem is caused by improper
management of virtual memory while in an interrupt context, but could have
other causes.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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