Bug 201035

Summary:	I2C bus probing crash on OpenChrome DRM
Product:	Drivers	Reporter:	Kevin Brace (kevinbrace)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	blocking
Priority:	P1
Hardware:	x86-64
OS:	Linux
URL:	https://cgit.freedesktop.org/openchrome/drm-openchrome/log/?h=drm-next-4.20
Kernel Version:	4.19 rc1	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	kern.log for VIA Embedded EPIA-M830 mainboard

Description Kevin Brace 2018-09-06 18:34:52 UTC

OpenChrome DRM was working fine (i.e., able to normally boot Xubuntu 16.04) until DRM maintainer's version of Linux 4.18 rc4.
When I upgraded to Linux 4.18 rc7, it stopped working.
I also upgraded to Linux 4.19 rc1, but it crashes for a similar reason.
It appears that there is a NULL pointer reference when probing for I2C bus.
The bug was observed on HP 2133 mini-note and VIA Embedded EPIA-M830 mainboard.

Comment 1 Kevin Brace 2018-09-06 18:38:43 UTC

Created attachment 278351 [details]
kern.log for VIA Embedded EPIA-M830 mainboard