Hi,
Yes, I also confirmed that it hits on the
mainline as well.
Unfortunately, the cause of the issue is not trivial.
Anyway, thanks for reporting.
Regards,
Ryusuke Konishi
On Wed, Dec 4, 2019 at 1:20 AM Walton Hoops <me@xxxxxxxxxxxxxxx> wrote:
>
> FYI, Arch got 5.4.1 this morning, and it looks like the issue is still
> present.
>
> On 11/20/19 12:34 AM, Ryusuke Konishi wrote:
> > As the result of bisection, it turned out that commit
> > f4bdb2697ccc9cecf1a9de86905c309ad901da4c on 5.3.y
> > ("mm/filemap.c: don't initiate writeback if mapping has no dirty pages")
> > triggers the crash.
> >
> > This patch was back ported from upstream kernel 5.4-rc1, and
> > applied to 4.19.84 as well.
> >
> > Will look into the change further and why it doesn't hit latest
> > kernels (5.4-rc8, etc).
> >
> > Regards,
> > Ryusuke Konishi
> >
> >
> >
> >
> >
> >
> > On Wed, Nov 20, 2019 at 12:46 AM Ryusuke Konishi
> > <konishi.ryusuke@xxxxxxxxx> wrote:
> >>
> >> Yeah, this looks a regression of the 5.3.11 stable kernel.
> >>
> >> I could reproduce the crash with 5.3.11.
> >>
> >> 5.3, 5.3.10 and 5.4-rc8 all worked fine.
> >>
> >> The regression would be identified by bisecting commits
> >> between kernel 5.3.10 and 5.3.11.
> >>
> >> Thanks,
> >> Ryusuke Konishi
> >>
> >> 2019年11月19日(火) 23:40 <linux-nilfs-ml.via.forwarder@xxxxxxxxxxxx>:
> >>>
> >>> I believe I have the same issue as Walton Hoops.
> >>>
> >>> I do not have a serial console, and all my filesystems are NILFS2,
> >>>
> >>> so I do not currently have an easy means to capture the crash.
> >>>
> >>> However, I experienced the same Kernel BUG on upgrading to kernel 5.11
> >>>
> >>> from 5.10. Reverting back to 5.10 results in a clean boot.
> >>>
> >>> The actual kernels I use are the Ubuntu 'mainline kernels'
> >>>
> >>> 5.3.10-050310-generic works
> >>>
> >>> 5.3.11-050311-generic crashes with Kernel BUG.
> >>>
> >>> So I suspect a change between those two versions has triggered the problem.
> >>>
> >>>
