From owner-svn-src-head@freebsd.org  Wed Feb 15 01:35:27 2017
Return-Path: <owner-svn-src-head@freebsd.org>
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 AD01CCDF84E;
 Wed, 15 Feb 2017 01:35:27 +0000 (UTC)
 (envelope-from markj@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 799B9238;
 Wed, 15 Feb 2017 01:35:27 +0000 (UTC)
 (envelope-from markj@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v1F1ZQbt059612;
 Wed, 15 Feb 2017 01:35:26 GMT (envelope-from markj@FreeBSD.org)
Received: (from markj@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id v1F1ZQjf059611;
 Wed, 15 Feb 2017 01:35:26 GMT (envelope-from markj@FreeBSD.org)
Message-Id: <201702150135.v1F1ZQjf059611@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: markj set sender to
 markj@FreeBSD.org using -f
From: Mark Johnston <markj@FreeBSD.org>
Date: Wed, 15 Feb 2017 01:35:26 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r313755 -
 head/sys/cddl/contrib/opensolaris/uts/common/dtrace
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: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 15 Feb 2017 01:35:27 -0000

Author: markj
Date: Wed Feb 15 01:35:26 2017
New Revision: 313755
URL: https://svnweb.freebsd.org/changeset/base/313755

Log:
  Check for an exiting process when enabling PID provider probes.
  
  MFC after:	1 week

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c	Wed Feb 15 00:16:52 2017	(r313754)
+++ head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c	Wed Feb 15 01:35:26 2017	(r313755)
@@ -1248,6 +1248,13 @@ fasttrap_pid_enable(void *arg, dtrace_id
 #else
 	if ((p = pfind(probe->ftp_pid)) == NULL)
 		return;
+	if ((p->p_flag & P_WEXIT) != 0) {
+		PROC_UNLOCK(p);
+		return;
+	}
+
+	_PHOLD(p);
+	PROC_UNLOCK(p);
 #endif
 
 	/*
@@ -1255,13 +1262,6 @@ fasttrap_pid_enable(void *arg, dtrace_id
 	 * the chance to execute the trap instruction we're about to place
 	 * in their process's text.
 	 */
-#ifdef __FreeBSD__
-	/*
-	 * pfind() returns a locked process.
-	 */
-	_PHOLD(p);
-	PROC_UNLOCK(p);
-#endif
 	fasttrap_enable_callbacks();
 
 	/*