Bug 151441 - Sleep functions (_PTS) - Crash on reboot
Summary: Sleep functions (_PTS) - Crash on reboot
Status: CLOSED UNREPRODUCIBLE
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Sleep-Wake (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Lv Zheng
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-08-04 10:54 UTC by Greg White
Modified: 2016-09-27 07:26 UTC (History)
4 users (show)

See Also:
Kernel Version: 4.8 pre-rc1
Subsystem:
Regression: No
Bisected commit-id:


Attachments
crash snapshot (3.48 MB, image/jpeg)
2016-08-04 10:54 UTC, Greg White
Details
acpidump.tar.gz (56.74 KB, application/gzip)
2016-08-10 22:58 UTC, Greg White
Details

Description Greg White 2016-08-04 10:54:13 UTC
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.
Comment 1 Robert Moore 2016-08-10 15:44:48 UTC
Please post the acpidump for this machine, thanks.
Comment 2 Greg White 2016-08-10 22:58:42 UTC
Created attachment 228261 [details]
acpidump.tar.gz
Comment 3 The Linux kernel's regression tracker (Thorsten Leemhuis) 2016-08-14 14:11:40 UTC
Greg, is this a problem that only shows up in 4.8-pre? If yes I'll put it in the next regression report.
Comment 4 Greg White 2016-08-14 14:30:46 UTC
Yes, only 4.8-pre.
Comment 5 Lv Zheng 2016-08-15 00:32:36 UTC
(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
Comment 6 Greg White 2016-08-15 00:35:23 UTC
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.
Comment 7 Lv Zheng 2016-08-15 00:45:13 UTC
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
Comment 8 The Linux kernel's regression tracker (Thorsten Leemhuis) 2016-08-28 09:35:18 UTC
(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.
Comment 9 Greg White 2016-08-28 22:59:29 UTC
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.
Comment 10 Lv Zheng 2016-08-29 07:20:29 UTC
(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

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