From owner-freebsd-current@FreeBSD.ORG Sat Jul 28 13:36:24 2007 Return-Path: Delivered-To: current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2937E16A41B for ; Sat, 28 Jul 2007 13:36:24 +0000 (UTC) (envelope-from marck@rinet.ru) Received: from woozle.rinet.ru (woozle.rinet.ru [195.54.192.68]) by mx1.freebsd.org (Postfix) with ESMTP id 9F84D13C4D3 for ; Sat, 28 Jul 2007 13:36:23 +0000 (UTC) (envelope-from marck@rinet.ru) Received: from localhost (localhost [127.0.0.1]) by woozle.rinet.ru (8.14.1/8.14.1) with ESMTP id l6SDaLpu085297; Sat, 28 Jul 2007 17:36:21 +0400 (MSD) (envelope-from marck@rinet.ru) Date: Sat, 28 Jul 2007 17:36:21 +0400 (MSD) From: Dmitry Morozovsky To: Maksim Yevmenkin In-Reply-To: Message-ID: <20070728173355.O42349@woozle.rinet.ru> References: <20070727141421.H42349@woozle.rinet.ru> X-NCC-RegID: ru.rinet X-OpenPGP-Key-ID: 6B691B03 MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (woozle.rinet.ru [0.0.0.0]); Sat, 28 Jul 2007 17:36:22 +0400 (MSD) Cc: current@freebsd.org Subject: Re: possible showstopper: kbdmux hangs -current X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Jul 2007 13:36:24 -0000 On Fri, 27 Jul 2007, Maksim Yevmenkin wrote: MY> On 7/27/07, Dmitry Morozovsky wrote: MY> > Hi there, MY> > MY> > on some of my mobos -current hangs early (when starning init) if kbdmux is MY> > included in kernel (both on i386 and amd64); this seems to be some race, as MY> > hangs are not 100% reproducible. What info should I provide to debug? MY> MY> the usual suspects are MY> MY> 1) while (KBDMUX_CHECK_CHAR(kbd)) { ... } loop in kbdmux_kbd_event(). MY> could you please try to put some debug printf's into it and make sure MY> it does not stuck there. errrm. Added two printfs with ppsratecheck - and, as usual, 'specialist presense effect' is in place: no single hang since, both on stock GENERIC and my own stripped down kernel so far (approx 20 reboots). Will try further. MY> MY> 2) callout. kbdmux callout initialized as non mp-safe to make sure MY> giant is held. MY> MY> 3) task queue. kbdmux(4) uses taskqueue_swi_giant. MY> MY> you might want to try uncomment section at line 81 in kbdmux.c. this MY> should add private lock for kbdmux(4). not sure it will work though - MY> many things has changed since i tried it. MY> MY> > I'm using only PS2 keyboards, and have no other format keyboards handy; MY> > however, I can obtain USB keyb if needed. MY> MY> are you using ps/2 mouse? if so, try to disconnect it and see if this helps. No, there is no mouse attached. Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------