From nobody Tue Feb 10 08:28:04 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1522258605934541.134317505169; Wed, 28 Mar 2018 10:36:45 -0700 (PDT) Received: from localhost ([::1]:40302 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f1F09-0002tQ-2N for importer@patchew.org; Wed, 28 Mar 2018 13:36:45 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55768) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f1EwH-00004x-59 for qemu-devel@nongnu.org; Wed, 28 Mar 2018 13:32:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f1EwE-0003xM-Hf for qemu-devel@nongnu.org; Wed, 28 Mar 2018 13:32:45 -0400 Received: from relay.sw.ru ([185.231.240.75]:45864) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f1EwE-0003wK-8S for qemu-devel@nongnu.org; Wed, 28 Mar 2018 13:32:42 -0400 Received: from msk-vpn.virtuozzo.com ([195.214.232.6] helo=kvm.sw.ru) by relay.sw.ru with esmtp (Exim 4.90_1) (envelope-from ) id 1f1EwB-0005l7-6d; Wed, 28 Mar 2018 20:32:39 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org Date: Wed, 28 Mar 2018 20:32:35 +0300 Message-Id: <20180328173238.507470-2-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.11.1 In-Reply-To: <20180328173238.507470-1-vsementsov@virtuozzo.com> References: <20180328173238.507470-1-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH 1/4] scripts/qemugdb: get pthread_self from "info threads" command X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, vsementsov@virtuozzo.com, stefanha@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" When debugging a coredump, pthread_self can't be obtained from function arch_prctl. Moreover if qemu crashed in coroutine, we can't find 'start_thread' in current stack-trace. So, add a method, actually proposed in 1138f24645e9e, which should work for gdb version >=3D 7.3. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Stefan Hajnoczi --- scripts/qemugdb/coroutine.py | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/scripts/qemugdb/coroutine.py b/scripts/qemugdb/coroutine.py index ab699794ab..ffaa45c464 100644 --- a/scripts/qemugdb/coroutine.py +++ b/scripts/qemugdb/coroutine.py @@ -14,6 +14,7 @@ # GNU GPL, version 2 or (at your option) any later version. =20 import gdb +import re =20 VOID_PTR =3D gdb.lookup_type('void').pointer() =20 @@ -28,7 +29,17 @@ def get_fs_base(): return fs_base =20 def pthread_self(): - '''Fetch pthread_self() from the glibc start_thread function.''' + # Try read pthread_self from gdb command 'info threads'. + # Will fail for old gdb. + try: + threads =3D gdb.execute('info threads', False, True) + m =3D re.search('^\* 1 Thread (0x[0-9a-f]+)', threads, re.MULTI= LINE) + return int(m.group(1), 16) + except TypeError: + # gdb doesn't support third parameter for execute + pass + + # Try fetch pthread_self() from the glibc start_thread function. f =3D gdb.newest_frame() while f.name() !=3D 'start_thread': f =3D f.older() --=20 2.11.1