From owner-freebsd-hackers Fri May 5 23:12:29 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from obie.softweyr.com (obie.softweyr.com [204.68.178.33]) by hub.freebsd.org (Postfix) with ESMTP id ED39037B521 for ; Fri, 5 May 2000 23:12:22 -0700 (PDT) (envelope-from wes@softweyr.com) Received: from softweyr.com (Foolstrustident!@homer.softweyr.com [204.68.178.39]) by obie.softweyr.com (8.8.8/8.8.8) with ESMTP id AAA10055; Sat, 6 May 2000 00:12:18 -0600 (MDT) (envelope-from wes@softweyr.com) Message-ID: <3913B80E.F899DCE9@softweyr.com> Date: Sat, 06 May 2000 00:13:34 -0600 From: Wes Peters Organization: Softweyr LLC X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 4.0-STABLE i386) X-Accept-Language: en MIME-Version: 1.0 To: Warner Losh Cc: hackers@FreeBSD.ORG Subject: Re: Can NMI drop a hanging FreeBSD kernel into DDB? References: <200005060453.WAA59241@harmony.village.org> <20000505122029.C29830@fw.wintelcom.net> <200005051831.LAA25307@george.lbl.gov> <200005060456.WAA59299@harmony.village.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Warner Losh wrote: > > In message <200005060453.WAA59241@harmony.village.org> Warner Losh writes: > : However, it won't work if you are hacking pci hardware and manage to > : hang the PCI bus. > > Unless, of course, the trap handler is in cache as well as the > debugger routines you need. On rare occasions this is true, but > almsot all the time it isn't. There's not a good way to force it > either since if you knew you were about to hang the pci bus, you'd not > do the action that would hang it :-). No cache-line-locking on x86? Sigh. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message