[Cc'ing LKML and linux-fsdevel to cast a wider net and raise awareness] On Tue, Nov 10 2015 at 10:02am -0500, Boštjan Škufca @ Teon.si <bostjan@xxxxxxx> wrote: > On 10 November 2015 at 15:39, Zdenek Kabelac <zkabelac@xxxxxxxxxx> wrote: > > Dne 10.11.2015 v 14:14 Boštjan Škufca @ Teon.si napsal(a): > >> > >> Hi all, > >> > >> 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 > > So 4.1.13 is ok in this respect, or is this unknown ATM? > > Does it depend on underlying storage at all, or not? MD does not seem > to be listed in stack trace. We don't yet have a reliable reproducer. So if your test proves to reliably reproduce the issue for you then we may be able to make much quicker progress. While the bug manifests as a crash in dm_any_congested (either NULL pointer or GPF) it _seems_ that the problem is further up the stack in the vfs and/or mm (by passing garbage into dm_any_congested via call to queue->backing_dev_info.congested_fn). But all possibilities are still on the table... again not much to go on yet. Please feel free to test using the 4.4 stable@ commit Zdenek referenced (but I'm skeptical it'll fix this issue if you aren't reactivating volumes or anything): http://git.kernel.org/linus/ad5f498f610 Also, you're welcome to update this BZ as you collect additional info: https://bugzilla.redhat.com/1279941 Thanks, Mike -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
