From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f196.google.com ([209.85.210.196]:33302 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404531AbgFXQJ4 (ORCPT ); Wed, 24 Jun 2020 12:09:56 -0400 Date: Wed, 24 Jun 2020 16:09:53 +0000 From: Luis Chamberlain Subject: Re: linux-next: umh: fix processed error when UMH_WAIT_PROC is used seems to break linux bridge on s390x (bisected) Message-ID: <20200624160953.GH4332@42.do-not-panic.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9e767819-9bbe-2181-521e-4d8ca28ca4f7@de.ibm.com> Sender: linux-s390-owner@vger.kernel.org List-ID: To: Christian Borntraeger 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 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