From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zdenek Kabelac Subject: Re: Bug in dm_any_congested? Date: Tue, 10 Nov 2015 15:39:04 +0100 Message-ID: <56420188.7030406@redhat.com> References: Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252"; Format="flowed" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: 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 Dne 10.11.2015 v 14:14 Bo=9Atjan =8Akufca @ Teon.si napsal(a): > Hi all, > > (I am not sure if this is the right address for this bug, but dm_* is > the first function listed in trace) > > this happened when I tried dd-ing LV, which resides on RAID10 sw > storage, to network via netcat. The actual user-visible manifestation > was segfault of dd that was used for reading. > > On first request the error reported was "unable to handle kernel NULL > pointer dereference...", but on subsequent tries this changed to > "general protection fault", see below. > > HW is a bit dated, but had no problems with it up to now, and SW raid > is used here. Kernel was 4.2.4. > > Is this the right mlist for such bug? Hi Yes the issue is known - but source is not fully known. I've opened public BZ: https://bugzilla.redhat.com/1279941 There is some potential fix - but unclear what it solves: http://git.kernel.org/linus/ad5f498f610 Regards Zdenek