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Re: kern/46481: page fault in uvmspace_free -> uvm_unmap_remove -> pmap_remove -> pmap_pdes_invalid

To: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/46481: page fault in uvmspace_free -> uvm_unmap_remove -> pmap_remove -> pmap_pdes_invalid
From: Chuck Silvers <chuq%chuq.com@localhost>
Date: Thu, 31 May 2012 21:22:34 -0700

I also see this problem quite easily, with both 6.0_BETA2 and -current.

it was introduced by this change:
http://mail-index.netbsd.org/source-changes/2012/04/20/msg033858.html
(support for 256 CPUs on amd64)

with that change reverted, this problem no longer occurs,
nor do other problems that I've seen on native amd64.

-Chuck

References:
- kern/46481: page fault in uvmspace_free -> uvm_unmap_remove -> pmap_remove -> pmap_pdes_invalid
  - From: dieter . NetBSD

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