Bug 130998

Summary:	suspend sometimes fails with BUG at swsusp.c:905
Product:	[openSUSE] SUSE LINUX 10.0	Reporter:	Martin Vidner <mvidner>
Component:	Kernel	Assignee:	Pavel Machek <pavel>
Status:	RESOLVED FIXED	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None
Version:	Final
Target Milestone:	---
Hardware:	i586
OS:	Other
Whiteboard:
Found By:	Other	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---
Attachments:	BUG_swsusp_c_905.jpg - kernel BUG screenshot

Description Martin Vidner 2005-10-27 13:19:01 UTC

On Toshiba Portege 3020CT, suspend to disk via powersave -U sometimes fails. Then I have to reset the machine and hope that fs journaling does its job. 

I haven't determined yet the exact circumstances. It worked with the same hardware on 9.3.

The kenel trace is not unfortunately written to disk so I attach its picture.
Let me know what other information I should provide.

Comment 1 Martin Vidner 2005-10-27 13:20:18 UTC

Created attachment 55705 [details]
BUG_swsusp_c_905.jpg - kernel BUG screenshot

Comment 2 Pavel Machek 2005-10-30 11:10:38 UTC

I've seen that BUG() before, but I do not know how to reproduce it; it only happens rarely :-(. Having reproducible way to trigger it would help a lot.

Comment 3 Martin Vidner 2005-11-03 19:50:02 UTC

On my machine it happens quite often, but I haven't found a way to reproduce it reliably yet. Can I do anything to help tracking it down in the meantime?

Comment 4 Pavel Machek 2005-11-07 09:19:58 UTC

The code was completely rewritten in 2.6.14-git... you can switch to that to get rid of the bug (but perhaps get some new one). You may also just remove the BUG_ON(). It is condition I did not expect and condition I do not understand, but it is probably not harmfull.

Comment 5 Pavel Machek 2006-01-11 10:19:09 UTC

SLES10 should have 2.6.15, so it should be fixed at least there.

Comment 6 Martin Vidner 2006-01-11 10:24:53 UTC

Yes.
On SL 10.0 I seem to have found a workaround of swapoff -a; swapon -a before suspend.
On 2.6.15 I think I saw the "0 pages freed" problem too, which made the suspend fail (but did not oops), but after the swap trick it worked.

Comment 7 Pavel Machek 2006-01-11 10:28:06 UTC

Thanks for testing. I'll try to remember swapoff/swapon trick.