Created attachment 135138 [details]
Upon system boot into X a complete hang on black screen is experienced every time after recent (4.13+) kernel upgrade. SysRq keys do not function after this point. Unfortunately was not able to extract any logs from hung system, no logs are written to disk or found after power cycle.
Kernel Version: anything after 4.12
Distro: Ubuntu 17.04
Machine: Laptop Aspire one 1-431 (AO1-431_106D_1.11)
Tested with drm-tip nightly: Same result.
dad@octo:~/src/linux$ git bisect good
8448661d65f6f5dbcdb9c5cba185b284f2464b65 is the first bad commit
Can you grab dmesg and logs from bad^ (the last known good commit)?
Created attachment 135147 [details]
Created attachment 135148 [details]
First of all. Sorry about spam.
This is mass update for our bugs.
Sorry if you feel this annoying but with this trying to understand if bug still valid or not.
If bug investigation still in progress, please ignore this and I apologize!
If you think this is not anymore valid, please comment to the bug that can be closed.
If you haven't tested with our latest pre-upstream tree(drm-tip), can you do that also to see if issue is valid there still and if you cannot see issue there, please comment to the bug.
The issue is still present in a fully updated Ubuntu 17.10 with the newest mainline kernel 4.16rc7 from http://kernel.ubuntu.com/~kernel-ppa/mainline/
Any advice from you Mika/Chris?
Created attachment 139098 [details] [review]
Reproduce with https://cgit.freedesktop.org/drm-tip
Then apply the attached 'disable wc' patch to see that the bisect is
valid. It should in effect revert the 448661d65f6f5dbcdb9c5cba185b284f2464b65
parts that are of suspect.
Is omega's machine also Braswell?
omega's machine is Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz
Not able to get x86 builds of drm-tip from last few days to book. Will try again next week.
Aun, any updates here?
Created attachment 139636 [details]
panic image 1
Created attachment 139637 [details]
panic image 2
Been trying pull and builds every few days to test patch for over 2 weeks. Can't get anything that won't panic on boot. Screen shot is from vm but real machine does same thing. Get same behavior on linus master and drm-tip master. Googling failed me. Need help, any suggestions?
Created attachment 139638 [details]
(In reply to aun.sswick from comment #14)
> Created attachment 139637 [details]
> panic image 2
This looks like https://lkml.org/lkml/2018/5/17/482
Setting CMA=n should get you a bootable kernel if you don't want to patch it.
Tried CMA=n but then initramfs couldn't find boot device. Building with and without patch now. Will be a few days before I can test again.
Got build that boots on different hardware.
On laptop with issue master and master+patch both hang.
master hangs after starting X just after _ in top left goes away.
patch hangs after starting X with a _ in top left.
Aun, Do you still see the issue? if so, reproduce the issue using drm-tip (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
No feedback for more than a month. Reducing the priority of the bug.
I did not open the issue but I had a similar one which is resolved:
There are still occasional freezes which are not yet solved:
The two bugs above don't seem related (the second one is not even specific to Intel HW).
Aun, do you continue seeing the original issue you reported?