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Tue, 23 Jun 2020 14:23:26 +0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05NENONw14876672 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 23 Jun 2020 14:23:24 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3C4AC42042; Tue, 23 Jun 2020 14:23:24 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AE55142057; Tue, 23 Jun 2020 14:23:22 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.187.217]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 23 Jun 2020 14:23:22 +0000 (GMT) Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected) From: Christian Borntraeger To: mcgrof@kernel.org Cc: 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: <20200610154923.27510-5-mcgrof@kernel.org> <20200623141157.5409-1-borntraeger@de.ibm.com> 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: <20200623141157.5409-1-borntraeger@de.ibm.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=2020-06-23_06:2020-06-23,2020-06-23 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 mlxscore=0 bulkscore=0 spamscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 impostorscore=0 phishscore=0 mlxlogscore=878 cotscore=-2147483648 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006230108 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On 23.06.20 16:11, Christian Borntraeger wrote: > Jens Markwardt reported a regression in the linux-next runs. with "umh: fix > processed error when UMH_WAIT_PROC is used" (from linux-next) a linux bridge > with an KVM guests no longer activates : > > without patch > # ip addr show dev virbr1 > 6: virbr1: mtu 1500 qdisc noqueue state UP group default qlen 1000 > link/ether 52:54:00:1e:3f:c0 brd ff:ff:ff:ff:ff:ff > inet 192.168.254.254/24 brd 192.168.254.255 scope global virbr1 > valid_lft forever preferred_lft forever > > with this patch the bridge stays DOWN with NO-CARRIER > > # ip addr show dev virbr1 > 6: virbr1: mtu 1500 qdisc noqueue state DOWN group default qlen 1000 > link/ether 52:54:00:1e:3f:c0 brd ff:ff:ff:ff:ff:ff > inet 192.168.254.254/24 brd 192.168.254.255 scope global virbr1 > valid_lft forever preferred_lft forever > > This was bisected in linux-next. Reverting from linux-next also fixes the issue. > > Any idea? FWIW, s390 is big endian. Maybe some of the shifts inn the __KW* macros are wrong.