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Date:      Tue, 25 Apr 1995 15:53:37 -0400 (EDT)
From:      Peter Dufault <dufault@hda.com>
To:        current@freefall.cdrom.com
Subject:   panic: pmap_zero_page: CMAP busy
Message-ID:  <199504251953.PAA19684@hda.com>

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I built a kernel from this morning's sup and it dies on a "Dell Dimension
486DX250" with the panic:

> pmap_zero_page: CMAP busy

It starts up single user fine, but will panic as soon as you type ps.
"ps" will go in to "pmap_zero_page" 26 times and on the 27'th time will
find that CMAP2 is already non-zero.

The Stack backtrace is

pmap_zero_page
vm_page_zero_fill
vm_fault
trap_pfault
trap(27, ...)

I don't have much experience with this system though it boots the GENERIC
kernel on the last SNAP fine.

-- 
Peter Dufault               Real Time Machine Control and Simulation
HD Associates, Inc.         Voice: 508 433 6936
dufault@hda.com             Fax:   508 433 5267



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