From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9759FC433DF for ; Fri, 26 Jun 2020 05:24:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 604AC20775 for ; Fri, 26 Jun 2020 05:24:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726942AbgFZFYY (ORCPT ); Fri, 26 Jun 2020 01:24:24 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:61164 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725306AbgFZFYX (ORCPT ); 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Fri, 26 Jun 2020 05:22:39 +0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05Q5Ma3Z48824420 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 26 Jun 2020 05:22:36 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4385911C064; Fri, 26 Jun 2020 05:22:36 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CFED011C04C; Fri, 26 Jun 2020 05:22:34 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.13.118]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 26 Jun 2020 05:22:34 +0000 (GMT) Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected) To: Luis Chamberlain Cc: Christoph Hellwig , ast@kernel.org, axboe@kernel.dk, bfields@fieldses.org, bridge@lists.linux-foundation.org, chainsaw@gentoo.org, christian.brauner@ubuntu.com, chuck.lever@oracle.com, davem@davemloft.net, dhowells@redhat.com, gregkh@linuxfoundation.org, jarkko.sakkinen@linux.intel.com, jmorris@namei.org, josh@joshtriplett.org, keescook@chromium.org, keyrings@vger.kernel.org, kuba@kernel.org, lars.ellenberg@linbit.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-security-module@vger.kernel.org, nikolay@cumulusnetworks.com, philipp.reisner@linbit.com, ravenexp@gmail.com, roopa@cumulusnetworks.com, serge@hallyn.com, slyfox@gentoo.org, viro@zeniv.linux.org.uk, yangtiezhu@loongson.cn, netdev@vger.kernel.org, markward@linux.ibm.com, linux-s390 References: <20200623141157.5409-1-borntraeger@de.ibm.com> <3118dc0d-a3af-9337-c897-2380062a8644@de.ibm.com> <20200624144311.GA5839@infradead.org> <9e767819-9bbe-2181-521e-4d8ca28ca4f7@de.ibm.com> <20200624160953.GH4332@42.do-not-panic.com> <4e27098e-ac8d-98f0-3a9a-ea25242e24ec@de.ibm.com> <4d8fbcea-a892-3453-091f-d57c03f9aa90@de.ibm.com> <1263e370-7cee-24d8-b98c-117bf7c90a83@de.ibm.com> <20200626025410.GJ4332@42.do-not-panic.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200626025410.GJ4332@42.do-not-panic.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-26_01:2020-06-26,2020-06-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 adultscore=0 impostorscore=0 mlxscore=0 phishscore=0 priorityscore=1501 cotscore=-2147483648 suspectscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006260035 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On 26.06.20 04:54, Luis Chamberlain wrote: > On Wed, Jun 24, 2020 at 08:37:55PM +0200, Christian Borntraeger wrote: >> >> >> On 24.06.20 20:32, Christian Borntraeger wrote: >> [...]> >>> So the translations look correct. But your change is actually a sematic change >>> if(ret) will only trigger if there is an error >>> if (KWIFEXITED(ret)) will always trigger when the process ends. So we will always overwrite -ECHILD >>> and we did not do it before. >>> >> >> So the right fix is >> >> diff --git a/kernel/umh.c b/kernel/umh.c >> index f81e8698e36e..a3a3196e84d1 100644 >> --- a/kernel/umh.c >> +++ b/kernel/umh.c >> @@ -154,7 +154,7 @@ static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info) >> * the real error code is already in sub_info->retval or >> * sub_info->retval is 0 anyway, so don't mess with it then. >> */ >> - if (KWIFEXITED(ret)) >> + if (KWEXITSTATUS(ret)) >> sub_info->retval = KWEXITSTATUS(ret); >> } >> >> I think. > > Nope, the right form is to check for WIFEXITED() before using WEXITSTATUS(). But this IS a change over the previous code, no? I will test next week as I am travelling right now.