Re: Oops when returning from hibernation with changed thunderbolt status

[Lukas Wunner <lukas@wunner.de>]

[cc += linux-efi]

On Thu, Nov 20, 2025 at 06:57:48AM +0100, Mika Westerberg wrote:
> On Wed, Nov 19, 2025 at 06:43:16PM +0100, Michael Guntsche wrote:
> > I started seeing this issue with kernel v6.15, it worked fine up to 6.14.
> > If my notebook went into hibernation with the docking station plugged
> > in and I then started it up again with the docking station unplugged
> > it would panic. Some times but not always it would also panic if the
> > dock was still connected.
> 
> Did you try to disable RTC_DRV_EFI? At least from the backtrace that's
> where it crashes.

The backtrace in the photo doesn't seem to betray what kind of call
was queued up on efi_rts_wq.  It doesn't have to be a set/get time
request.  efi_queue_work() is also called for set/get variable requests
among other things.  I recommend instrumenting __efi_queue_work()
with a call to dump_stack() to see where this is coming from.
Maybe add an msleep(5000) afterwards to allow time to take a picture.

Also the photo shows a UBSAN splat in drm/display/drm_mst_topology.c
220 msec before the oops, maybe it's related?

Thanks,

Lukas