From owner-freebsd-bugs@FreeBSD.ORG Mon Aug 9 08:20:08 2010 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E259A1065672 for ; Mon, 9 Aug 2010 08:20:07 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 9DD9F8FC1A for ; Mon, 9 Aug 2010 08:20:07 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id o798K7eK079366 for ; Mon, 9 Aug 2010 08:20:07 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id o798K7ZO079365; Mon, 9 Aug 2010 08:20:07 GMT (envelope-from gnats) Resent-Date: Mon, 9 Aug 2010 08:20:07 GMT Resent-Message-Id: <201008090820.o798K7ZO079365@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, jaroslav.suchanek@avg.com Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0E87E1065675 for ; Mon, 9 Aug 2010 08:10:03 +0000 (UTC) (envelope-from Jaroslav.Suchanek@avg.com) Received: from ms.grisoft.cz (ms.avg.com [193.85.188.248]) by mx1.freebsd.org (Postfix) with ESMTP id B5C8B8FC1A for ; Mon, 9 Aug 2010 08:10:02 +0000 (UTC) Received: from deimos.cz.avg.com (unknown [192.168.200.161]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by ms.grisoft.cz (Postfix) with ESMTP id D2E433824A for ; Mon, 9 Aug 2010 09:59:01 +0200 (CEST) Received: from jardas.grisoft.cz (192.168.200.87) by mail.cz.avg.com (192.168.200.162) with Microsoft SMTP Server (TLS) id 8.3.83.0; Mon, 9 Aug 2010 09:59:01 +0200 Received: from jardas.grisoft.cz (localhost [127.0.0.1]) by jardas.grisoft.cz (8.14.4/8.14.3) with ESMTP id o797wn9v001529 for ; Mon, 9 Aug 2010 09:58:49 +0200 (CEST) (envelope-from jarda@jardas.grisoft.cz) Received: (from jarda@localhost) by jardas.grisoft.cz (8.14.4/8.14.4/Submit) id o797wnFm001528; Mon, 9 Aug 2010 09:58:49 +0200 (CEST) (envelope-from jarda) Message-Id: <201008090758.o797wnFm001528@jardas.grisoft.cz> Date: Mon, 9 Aug 2010 09:58:49 +0200 From: To: X-Send-Pr-Version: 3.113 Cc: Subject: bin/149464: dlclose can access freed memory and crash X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: jaroslav.suchanek@avg.com List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Aug 2010 08:20:08 -0000 >Number: 149464 >Category: bin >Synopsis: dlclose can access freed memory and crash >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Aug 09 08:20:07 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Jaroslav Suchanek >Release: FreeBSD 8.0-RELEASE-p2 amd64 >Organization: >Environment: System: FreeBSD jardas.grisoft.cz 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #3: Mon Mar 1 12:02:47 CET 2010 root@jardas.grisoft.cz:/usr/obj/usr/src/sys/JSKERNEL amd64 >Description: This might be related to pr bin/42397. Consider this situation: - a binary loads two shared libraries A and B via dlopen() - both A and B loads shared library C via dlopen() - the binary calls dlclose on A. While unloading A the reference count of C is correctly decreased - the binary calls dlclose on B and crash occurs. The C is correctly unmapped though >How-To-Repeat: Run the attached test case. >Fix: I don't know yet. >Release-Note: >Audit-Trail: >Unformatted: