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SubjectRe: Kernel panic during drm/nouveau init 5.3.0-rc7-next-20190903
On Mon, Sep 23, 2019 at 9:38 AM Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> > > 'Git bisect' has identified the following commits as being 'bad'.
> > >
> > > b96f3e7c8069b749a40ca3a33c97835d57dd45d2 is the first bad commit
> > > commit b96f3e7c8069b749a40ca3a33c97835d57dd45d2
> > > Author: Gerd Hoffmann <kraxel@redhat.com>
> > > Date: Mon Aug 5 16:01:10 2019 +0200
> > >
> > > drm/ttm: use gem vma_node
> > >
> > > Drop vma_node from ttm_buffer_object, use the gem struct
> > > (base.vma_node) instead.
> > >
> > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > > Reviewed-by: Christian König <christian.koenig@amd.com>
> > > Link: http://patchwork.freedesktop.org/patch/msgid/20190805140119.7337-9-kraxel@redhat.com
>
> > > Today, I upgraded the kernel to 5.3.0-next-20190919, which booted fine
> > > with no Xorg regressions to report.
> > >
> > > Just wondering if the earlier kernels would not boot for me because of
> > > the changes introduced by the 'bad' commits being perhaps incomplete?
>
> Yes, we had a regression in nouveau, fixed by this patch (in drm-misc-next):
>
> commit 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
> Author: Thierry Reding <treding@nvidia.com>
> Date: Wed Aug 14 11:00:48 2019 +0200
>
> drm/nouveau: Initialize GEM object before TTM object
>
> TTM assumes that drivers initialize the embedded GEM object before
> calling the ttm_bo_init() function. This is not currently the case
> in the Nouveau driver. Fix this by splitting up nouveau_bo_new()
> into nouveau_bo_alloc() and nouveau_bo_init() so that the GEM can
> be initialized before TTM BO initialization when necessary.
>
> Fixes: b96f3e7c8069 ("drm/ttm: use gem vma_node")
> Acked-by: Gerd Hoffmann <kraxel@redhat.com>
> Acked-by: Ben Skeggs <bskeggs@redhat.com>
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20190814093524.GA31345@ulmo
>
> HTH,
> Gerd
>

Terrific.
Thanks for the info.

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