Bug 120591
| Summary: | BUG() in dmesg after loading nouveau module | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Dmitrii Tcvetkov (demfloro) |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | CLOSED CODE_FIX | ||
| Severity: | high | CC: | demfloro, imirkin |
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| Kernel Version: | 4.7-rc3 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
dmesg
kernel config fix dmesg with patched kernel |
||
Created attachment 220571 [details]
kernel config
Looks like commit f045f459d925138fe7d6193a8c86406bda7e49da Author: Ben Skeggs <bskeggs@redhat.com> Date: Thu Jun 2 12:23:31 2016 +1000 drm/nouveau/fbcon: fix out-of-bounds memory accesses does not properly deal with disabled fbdev emulation. Can you add a if (fbcon->helper.fbdev) before that added line in nouveau_fbcon_init? I assume that will resolve your issue. Created attachment 220611 [details]
fix
Suggested by Ilia Mirkin
Thanks, that change helped, nouveau loaded successfully, Xorg started normally. Created attachment 220621 [details]
dmesg with patched kernel
Dmitrii, you should mail that patch (as a proper commit) to bskeggs@redhat.com and/or nouveau@lists.freedesktop.org . If you're not sure how to do that, I can take care of that for you. Thank you for advice, I've sent the patch, mail awaits moderation. commit 52dfcc5ccfbb6697ac3cac7f7ff1e712760e1216 Author: Dmitrii Tcvetkov <demfloro@demfloro.ru> Date: Mon Jun 20 13:52:14 2016 +0300 drm/nouveau: fix for disabled fbdev emulation |
Created attachment 220561 [details] dmesg OS: Arch Linux Video adapter: GeForce GTX 780 Ti xf86-nouveau: 1.0.12 I blacklisted nouveau module for full OS initialisation before reproducing, then issued: # modprobe nouveau debug=trace After that screen becomes black and in dmesg appears: BUG: unable to handle kernel NULL pointer dereference at 0000000000000210 Bug is not reproducible with 4.7-rc2 or earlier mainline.