Re: acpi issues on FreeBSD-current_r350103 on Thinkpad A485

On ds., jul. 20 2019, Evilham wrote:
>>> Serious issue:
>>> I was just debugging this right now, more infos with a proper
>>> bug
>>> report will come, but I think the system encounters a deadlock
>>> sometimes with the drm-kmod / amdgpu which results in a kernel
>>> panic.
>>> It is a serious issue, but it allows me to use the computer 
>>> for
>>> work,
>>> it doesn't happen every couple hours, but it does happen a
>>> couple
>>> times a day.
>>>
>>> FWIW, this is part of the crashlog:
>>>
>>> WARNING !drm_modeset_is_locked(&plane->mutex) failed at
>>> /wrkdirs/usr/ports/graphics/drm-fbsd12.0-kmod/work/kms-drm-6365030/drivers/gpu/drm/drm_atomic_helper.c:821
>>> [Multiple times...]
>>> kernel trap 22 with interrupts disabled
>>>  kernel trap 22 with interrupts
>>>  disabled
>>> kernel trap 22 with interrupts disabled
>>> kernel trap 22 with interrupts disabled
>>>  panic: spin lock held too long


And this is why I wanted to do more debugging before raising an 
issue :-).

It kept happening without drm-kmod but the backtrace was 
different, which allowed me to reduce it to a piece of alpha 
Software I use pretty much all the time: WireGuard.
See: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239351

So, update: there is no *serious* issue when using the ThinkPad 
A485, it works mostly fine with minor annoyances (including the 
fact that installation media won't work out of the box).
--
Evilham