From owner-svn-src-head@freebsd.org Wed Jan 27 21:37:45 2016 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 20279A7089A; Wed, 27 Jan 2016 21:37:45 +0000 (UTC) (envelope-from bdrewery@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id E1C591CEC; Wed, 27 Jan 2016 21:37:44 +0000 (UTC) (envelope-from bdrewery@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u0RLbhLF005005; Wed, 27 Jan 2016 21:37:43 GMT (envelope-from bdrewery@FreeBSD.org) Received: (from bdrewery@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u0RLbhRW005004; Wed, 27 Jan 2016 21:37:43 GMT (envelope-from bdrewery@FreeBSD.org) Message-Id: <201601272137.u0RLbhRW005004@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: bdrewery set sender to bdrewery@FreeBSD.org using -f From: Bryan Drewery Date: Wed, 27 Jan 2016 21:37:43 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r294957 - head/sys/dev/filemon X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 Jan 2016 21:37:45 -0000 Author: bdrewery Date: Wed Jan 27 21:37:43 2016 New Revision: 294957 URL: https://svnweb.freebsd.org/changeset/base/294957 Log: filemon_dtr: Lock the associated filemon handle before writing to it. Reported by: mjg MFC after: 2 weeks Sponsored by: EMC / Isilon Storage Division Modified: head/sys/dev/filemon/filemon.c Modified: head/sys/dev/filemon/filemon.c ============================================================================== --- head/sys/dev/filemon/filemon.c Wed Jan 27 21:27:05 2016 (r294956) +++ head/sys/dev/filemon/filemon.c Wed Jan 27 21:37:43 2016 (r294957) @@ -126,14 +126,16 @@ filemon_dtr(void *data) struct filemon *filemon = data; if (filemon != NULL) { - struct file *fp = filemon->fp; + struct file *fp; - /* Get exclusive write access. */ + /* Follow same locking order as filemon_pid_check. */ filemon_lock_write(); + filemon_filemon_lock(filemon); /* Remove from the in-use list. */ TAILQ_REMOVE(&filemons_inuse, filemon, link); + fp = filemon->fp; filemon->fp = NULL; filemon->pid = -1; @@ -141,6 +143,7 @@ filemon_dtr(void *data) TAILQ_INSERT_TAIL(&filemons_free, filemon, link); /* Give up write access. */ + filemon_filemon_unlock(filemon); filemon_unlock_write(); if (fp != NULL)