Created attachment 227511 [details] crash snapshot Intermittent crash on reboot. See attached screen shot. Note that there are two backtraces here. It's the first one, not the slowpath warning.
Please post the acpidump for this machine, thanks.
Created attachment 228261 [details] acpidump.tar.gz
Greg, is this a problem that only shows up in 4.8-pre? If yes I'll put it in the next regression report.
Yes, only 4.8-pre.
(In reply to Greg White from comment #4) > Yes, only 4.8-pre. Since this is a regression, is that possible for you to bisect the culprit out using "git bisect"? Thanks Lv
I've tried. It's very intermittent now, and I haven't managed to successfully bisect it since I can't really cleanly find the break point. Will keep trying.
Also, according to your description, this regression sounds to be caused by this commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2c85025c So you can also try to revert this commit (git revert 2c85025c), then build and boot the kernel. Thanks
(In reply to Lv Zheng from comment #7) > So you can also try to revert this commit (git revert 2c85025c), then build > and boot the kernel. @Greg: Did you try this? Just wondering, because this bug is on the list of regressions for 4.8 and it would be good to finally track it down before 4.8 gets released.
I stopped seeing this crash. As I said, it was intermittent. I *have* been seeing a hang on reboot, also intermittent, but I have absolutely zero information about what's causing that - and reverting the commit you mention makes no difference in the hang.
(In reply to Greg White from comment #9) > I stopped seeing this crash. As I said, it was intermittent. So let's close it. You can re-open it when you can reproduce it. > > I *have* been seeing a hang on reboot, also intermittent, but I have > absolutely zero information about what's causing that - and reverting the > commit you mention makes no difference in the hang. Please file a different bug describing this in details. Thanks Lv