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From: John Dyson <dyson>
Message-Id: <199510090258.TAA20302@freefall.freebsd.org>
Subject: Re: vm_page_free panic with KTRACE
To: peter@haywire.dialix.com (Peter Wemm)
Date: Sun, 8 Oct 1995 19:58:21 -0700 (PDT)
Cc: freebsd-current@freebsd.org
In-Reply-To: <45a1q9$gi$1@haywire.DIALix.COM> from "Peter Wemm" at Oct 9, 95 10:35:53 am
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> 
> swallace@ece.uci.edu (Steven Wallace) writes:
> 
> >I just noticed that doing a ktrace will cause a vm_page_free panic:
> >vm_page_free:  offset(46092288), bmapped(0), busy(1), PG_BUSY - freeing busy pg.
> 
> >Just do a ktrace and then during or shortly after while swapping
> >it will panic.  Don't do ktrace, system up for long time.
> >Same ktrace/free bug in today -current and sept 25 -current kernel of mine.
> 
> >Steven
> 
> >P.S.  I *need* ktrace to debug the stupid ibcs2 emulator (:
> 
> Ahh.. So I wasn't imagining it!  I've had this turn up occasionally
> for quite some time now.
> 
> The last time was a couple of days ago when I was trying to ktrace the
> -current "port" of screen which doesn't work.  (it only works if
> setuid is turned off)
> 
> -Peter
> 
Working on it and awaiting a response from Steven if my work-around fixes
the problem for now!!!

John
dyson@freebsd.org