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Wed, 24 Jun 2020 17:58:41 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05OHwd2W27590710 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 24 Jun 2020 17:58:39 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 79AC4A4055; Wed, 24 Jun 2020 17:58:39 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 11C24A4053; Wed, 24 Jun 2020 17:58:38 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.22.164]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 24 Jun 2020 17:58:37 +0000 (GMT) From: Christian Borntraeger 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: <20200610154923.27510-5-mcgrof@kernel.org> <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> 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: <20200624160953.GH4332@42.do-not-panic.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-24_11:2020-06-24,2020-06-24 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 cotscore=-2147483648 mlxscore=0 phishscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 impostorscore=0 bulkscore=0 mlxlogscore=748 priorityscore=1501 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006240117 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 24.06.20 18:09, Luis Chamberlain wrote: > On Wed, Jun 24, 2020 at 05:54:46PM +0200, Christian Borntraeger wrote: >> >> >> On 24.06.20 16:43, Christoph Hellwig wrote: >>> On Wed, Jun 24, 2020 at 01:11:54PM +0200, Christian Borntraeger wrote: >>>> Does anyone have an idea why "umh: fix processed error when UMH_WAIT_PROC is used" breaks the >>>> linux-bridge on s390? >>> >>> Are we even sure this is s390 specific and doesn't happen on other >>> architectures with the same bridge setup? >> >> Fair point. AFAIK nobody has tested this yet on x86. > > Regardless, can you enable dynamic debug prints, to see if the kernel > reveals anything on the bridge code which may be relevant: > > echo "file net/bridge/* +p" > /sys/kernel/debug/dynamic_debug/control > > Luis When I start a guest the following happens with the patch: [ 47.420237] virbr0: port 2(vnet0) entered blocking state [ 47.420242] virbr0: port 2(vnet0) entered disabled state [ 47.420315] device vnet0 entered promiscuous mode [ 47.420365] virbr0: port 2(vnet0) event 16 [ 47.420366] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 47.420373] virbr0: toggle option: 12 state: 0 -> 0 [ 47.420536] virbr0: port 2(vnet0) entered blocking state [ 47.420538] virbr0: port 2(vnet0) event 16 [ 47.420539] virbr0: br_fill_info event 16 port vnet0 master virbr0 and the nothing happens. without the patch [ 33.805410] virbr0: hello timer expired [ 35.805413] virbr0: hello timer expired [ 36.184349] virbr0: port 2(vnet0) entered blocking state [ 36.184353] virbr0: port 2(vnet0) entered disabled state [ 36.184427] device vnet0 entered promiscuous mode [ 36.184479] virbr0: port 2(vnet0) event 16 [ 36.184480] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 36.184487] virbr0: toggle option: 12 state: 0 -> 0 [ 36.184636] virbr0: port 2(vnet0) entered blocking state [ 36.184638] virbr0: port 2(vnet0) entered listening state [ 36.184639] virbr0: port 2(vnet0) event 16 [ 36.184640] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 36.184645] virbr0: port 2(vnet0) event 16 [ 36.184646] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 37.805478] virbr0: hello timer expired [ 38.205413] virbr0: port 2(vnet0) forward delay timer [ 38.205414] virbr0: port 2(vnet0) entered learning state [ 38.205427] virbr0: port 2(vnet0) event 16 [ 38.205430] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 38.765414] virbr0: port 2(vnet0) hold timer expired [ 39.805415] virbr0: hello timer expired [ 40.285410] virbr0: port 2(vnet0) forward delay timer [ 40.285411] virbr0: port 2(vnet0) entered forwarding state [ 40.285418] virbr0: topology change detected, propagating [ 40.285420] virbr0: decreasing ageing time to 400 [ 40.285427] virbr0: port 2(vnet0) event 16 [ 40.285432] virbr0: br_fill_info event 16 port vnet0 master virbr0 [ 40.765408] virbr0: port 2(vnet0) hold timer expired [ 41.805415] virbr0: hello timer expired [ 42.765426] virbr0: port 2(vnet0) hold timer expired [ 43.805425] virbr0: hello timer expired [ 44.765426] virbr0: port 2(vnet0) hold timer expired [ 45.805418] virbr0: hello timer expired and continuing....