From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Parschauer Subject: Re: 3.12.y: srcu warning during free_dev() with dm-multipath Date: Mon, 22 Jun 2015 14:22:54 +0200 Message-ID: <5587FE1E.5000503@profitbricks.com> References: <55819FD1.4010306@profitbricks.com> <5587CD74.40401@profitbricks.com> <5587E281.5030606@gmail.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5587E281.5030606@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development List-Id: dm-devel.ids On 22.06.2015 12:25, Zdenek Kabelac wrote: > Dne 22.6.2015 v 10:55 Sebastian Parschauer napsal(a): >> Really, no response? Again? >> >> Why doesn't that surprise me if sending a bug report to Red Hat not >> using their kernel,... Thanks a lot! So this is how discrimination feels >> like,... >> > > Have you checked your problem exists in the latest upstream kernel ? It likely doesn't. I can't roll out the latest greatest unstable upstream kernel into a public IaaS cloud where I can see the problem from time to time but in a test environment it's more difficult to reproduce. We also have custom code running in different unrelated parts which would have to be adapted. > If you are resolving issue with kernel 3.12 - it's likely a thing for > your distribution and its maintenance support? We are our own distribution. So I'm just the distribution maintainer asking the authors of a patch if that one could be related instead of doing reverse engineering. Maintainers should have a feeling for their code and also care for important fixes so that these find their way into the stable trees - no matter which distribution. Maybe that's the difference between homebrew FOSS and commercial FOSS. But there are upstream kernel maintainers who do care for linux-stable. I'd like to mention md maintainer Neil Brown here. > Upstream (and this is upstream ml) is close to release 4.1 kernel - so > you are fixing couple years old issue? What kind of action do you expect ? Just a hint at which patches to look at. You maintain a 3.10 kernel for RHEL 7. That one is also old and not latest upstream. I'll try the patch. Cheers, Sebastian >> On 17.06.2015 18:26, Sebastian Parschauer wrote: >>> Hi dm developers, >>> >>> we hit the srcu warning in cleanup_srcu_struct() when removing >>> dm-multipath devices. We run v3.12.40 but there is no change compared to >>> v3.12.44 in drivers/md/dm.c or kernel/srcu.c. >>> >>> Would the following upstream commit fix this? >>> >>> 63a4f06 dm: fix add_disk() NULL pointer due to race with free_dev() >>> >>> Thanks, >>> Sebastian >> > > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel