From owner-freebsd-alpha  Thu Jun 14  8:59:55 2001
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Date: Thu, 14 Jun 2001 11:59:42 -0400
From: Alfred Perlstein <alfred@freebsd.org>
To: Andrew Gallatin <gallatin@cs.duke.edu>
Cc: jhb@freebsd.org;, freebsd-alpha@freebsd.org
Subject: Re: alpha pmap corruption continues
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References: <15144.55776.3763.28141@grasshopper.cs.duke.edu>
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* Andrew Gallatin <gallatin@cs.duke.edu> [010614 11:36] wrote:
> 
> John,
> 
> With your http://people.freebsd.org/~jhb/patches/vm.patch and
> with rev 1.60 of alpha/trap.c reverted, I'm still seeing what
> looks like pmap corruption with a (mostly) GENERIC kernel on a UP
> alpha a few minutes into a -j32 buildworld.
[snip]
> 
> db> e vm_faults_no_vm_mtx
> vm_faults_no_vm_mtx:    b7c70
> db> e vm_faults_no_giant
> vm_faults_no_giant:     0
> db> 
> 
> 
> So.. maybe this is a dumb question, but it looks like the vm_mtx was
> locked in vm_map_lookup as part of the vm fault path.  But, it SHOULD
> have gotten locked in exit1(), around pmap_remove_pages, shouldn't it?  So,
> shouldn't there have been a lock-recursion message in there?
> 
> I don't understand.

Since John has made giant required by all vm code again, the only
panics you should see relating to vm_mtx are failed assertions,
that is unless John missed a spot where giant was needed.

-- 
-Alfred Perlstein [alfred@freebsd.org]
Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.

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