Re: [5.10.y] "driver core: platform: use bus_type functions" causes freeze on shutdown

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Mon, Mar 09, 2026 at 06:34:47PM -0700, Barry K. Nathan wrote:
> On 3/9/26 07:43, Greg Kroah-Hartman wrote:
> > On Mon, Mar 09, 2026 at 07:03:33AM -0700, Barry K. Nathan wrote:
> > > To be very clear, I want to emphasize up front that this is regarding
> > > the *current 5.10.y queue*, and not any 5.10.y release. This does not
> > > affect any currently released 5.10.y kernel.
> > > 
> > > When I apply the current 5.10.y queue on top of 5.10.252, the result
> > > is a kernel that consistently freezes on shutdown, both when running
> > > directly on my Lenovo ThinkPad T14 Gen 1 (Debian 12 bookworm running on
> > > an Intel Core i5-10310U) and when running in a virt-manager VM (I didn't
> > > put much thought into it and just happened to pick a Debian 13 trixie VM
> > > for my testing).
> > > 
> > > (Just once in my testing, there was a visible kernel panic, but there
> > > was also screen corruption, and it looks to me like it might've frozen
> > > up partway through the panic being printed on the screen, so I'm not
> > > sure how useful it would be. I did take a photo so I guess I could
> > > post it up somewhere if it might be useful, or maybe I'll try to type
> > > it in from the photo later today or tomorrow.)
> > > 
> > > I bisected manually, and it turned out to be this patch:
> > > "driver core: platform: use bus_type functions"
> > > (driver-core-platform-use-bus_type-functions.patch)
> > 
> > That patch has been dropped from the queue earlier this morning, so all
> > should be fine.
> > 
> > thanks,
> > 
> > greg k-h
> 
> $ git pull
> Already up to date.
> $ fgrep bus_type queue-5.10/series
> driver-core-platform-use-bus_type-functions.patch
> 
> It doesn't look like the patch has been dropped yet from the
> 5.10.y queue in the stable-queue git repo on kernel.org.
> 
> (At least as of this writing, around 6:30 PM PDT, you can go to
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10
> and see that the patch is still there.)
> 
> 
> By the way, if dropping this patch turns out not to be the correct course
> of action, I think backporting one additional patch will fix it.
> 
> I applied the following patch directly from mainline to test it; it
> applied with an offset but no fuzz. I did some brief testing and it
> seems to fix the problem (no more freezing on shutdown).
> 
> mainline commit 46e85af0cc53f35584e00bb5db7db6893d0e16e5
> driver core: platform: don't oops in platform_shutdown() on unbound devices

Ugh, my fault, I was confusing this with a different patch.  I'll go
drop all of these now, thanks for confirming.

greg k-h