From owner-freebsd-current Mon Mar 12 10:50:25 2001 Delivered-To: freebsd-current@freebsd.org Received: from meow.osd.bsdi.com (meow.osd.bsdi.com [204.216.28.88]) by hub.freebsd.org (Postfix) with ESMTP id E1FDA37B719 for ; Mon, 12 Mar 2001 10:50:22 -0800 (PST) (envelope-from jhb@FreeBSD.org) Received: from laptop.baldwin.cx (john@jhb-laptop.osd.bsdi.com [204.216.28.241]) by meow.osd.bsdi.com (8.11.2/8.11.2) with ESMTP id f2CIoBA81585; Mon, 12 Mar 2001 10:50:11 -0800 (PST) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.4.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Mon, 12 Mar 2001 10:49:51 -0800 (PST) From: John Baldwin To: "Alexander N. Kabaev" Subject: RE: -CURRENT no longer boots Cc: current@FreeBSD.org, Dag-Erling Smorgrav Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 12-Mar-01 Alexander N. Kabaev wrote: > Do you have WITNESS_SKIPSPIN option in your kernel config? > > Here is what supposedly causing the trouble: > > a) the process p_spinlocks variable is initialized to one in fork1 during > the process creation > b) the sched_lock is released later in fork_exit, but the process' > p_spinlocks field is not decreased because sched_lock is not tracked by > the > witness subsystem > b) process tried to grab Giant but sees p_spinlocks > 0 ... instant panic :) c) As part of the new witness code, move p_spinlocks (well, a variation thereof) to be a per-CPU variable. > The quick and dirty fix is to either set debug.witness_skipspin=0 in > /boot/loader.conf or modify witness_enter function to ignore p_skipspin > counter > if debug.witness_skipspin is non-zero. Just don't use the skipspin stuff, it shouldn't hurt at all. The new witness code will hopefully be in by the end of the week. *crosses fingers* -- John Baldwin -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message