kern/161887: [vm] [panic] panic at vm_page_wire with FreeBSD 9.0 Beta 3 [regression]

[Andriy Gapon]

The following reply was made to PR kern/161887; it has been noted by GNATS.

From: Andriy Gapon <avg at FreeBSD.org>
To: bug-followup at FreeBSD.org, bsdboot at gmail.com
Cc:  
Subject: Re: kern/161887: [vm] [panic] panic at vm_page_wire with FreeBSD
 9.0 Beta 3 [regression]
Date: Sun, 30 Oct 2011 12:31:25 +0200

 Do you build your test module as a part of a kernel+modules build or do you
 build it in isolation?  If the latter, then this could be a known obscure problem.
 
 A standalone module build doesn't get some important definitions from kernel
 config (e.g. via  opt_global.h) and can be in a serious disagreement with the
 kernel.  In particular, if a kernel is built with SMP option, but a module build
 doesn't have SMP defined, then they will have different definitions of
 PA_LOCK_COUNT and thus would work on different actual locks when manipulating
 the same page.
 
 -- 
 Andriy Gapon