From owner-freebsd-bugs@FreeBSD.ORG Tue Jan 23 01:00:37 2007 Return-Path: X-Original-To: freebsd-bugs@hub.freebsd.org Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id C99DA16A402 for ; Tue, 23 Jan 2007 01:00:37 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [69.147.83.40]) by mx1.freebsd.org (Postfix) with ESMTP id 93F4D13C474 for ; Tue, 23 Jan 2007 01:00:37 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.13.4/8.13.4) with ESMTP id l0N10b3K004120 for ; Tue, 23 Jan 2007 01:00:37 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.13.4/8.13.4/Submit) id l0N10bjN004119; Tue, 23 Jan 2007 01:00:37 GMT (envelope-from gnats) Resent-Date: Tue, 23 Jan 2007 01:00:37 GMT Resent-Message-Id: <200701230100.l0N10bjN004119@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, Jessica Han Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 74E8D16A401 for ; Tue, 23 Jan 2007 00:59:01 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [69.147.83.33]) by mx1.freebsd.org (Postfix) with ESMTP id 663E413C4BF for ; Tue, 23 Jan 2007 00:59:01 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.13.1/8.13.1) with ESMTP id l0N0x1uV047146 for ; Tue, 23 Jan 2007 00:59:01 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.13.1/8.13.1/Submit) id l0N0x1c9047145; Tue, 23 Jan 2007 00:59:01 GMT (envelope-from nobody) Message-Id: <200701230059.l0N0x1c9047145@www.freebsd.org> Date: Tue, 23 Jan 2007 00:59:01 GMT From: Jessica Han To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.0 Cc: Subject: gnu/108229: Infinite loop with kgdb while debugging mis-match kernel/core X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Jan 2007 01:00:37 -0000 >Number: 108229 >Category: gnu >Synopsis: Infinite loop with kgdb while debugging mis-match kernel/core >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: change-request >Submitter-Id: current-users >Arrival-Date: Tue Jan 23 01:00:36 GMT 2007 >Closed-Date: >Last-Modified: >Originator: Jessica Han >Release: FreeBSD 6.1-RELEASE >Organization: Juniper Networks >Environment: i386 >Description: I got an infinite loop while trying to debug a kernel core on FreeBSD 6.1, note that I happened to be debugging a wrong "kernel" binary for the core dump. # uname -sr FreeBSD 6.1-RELEASE #kgdb kernel vmcore.0 kgdb: kvm_read: invalid address (0x50012) kgdb: kvm_read: invalid address (0x7) kgdb: kvm_read: invalid address (0xf5c) kgdb: kvm_read: invalid address (0xf5c) kgdb: kvm_read: invalid address (0xf5c) I've got a patch to fix it, can somebody review and commit it if it is okay? Thanks, Jessica >How-To-Repeat: >Fix: Patch attached with submission follows: --- /6.1-vanila/src/gnu/usr.bin/gdb/kgdb/kthr.c Wed Sep 14 22:32:10 2005 +++ gnu/usr.bin/gdb/kgdb/kthr.c Thu Nov 16 12:37:41 2006 @@ -92,12 +92,16 @@ dumptid = -1; while (paddr != 0) { - if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) + if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) { warnx("kvm_read: %s", kvm_geterr(kvm)); + break; + } addr = (uintptr_t)TAILQ_FIRST(&p.p_threads); while (addr != 0) { - if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td)) + if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td)) { warnx("kvm_read: %s", kvm_geterr(kvm)); + break; + } kt = malloc(sizeof(*kt)); kt->next = first; kt->kaddr = addr; >Release-Note: >Audit-Trail: >Unformatted: