linux-kernel - Re: Memory allocation problem with 2.6.22 after suspend/resume cycle

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Message-ID: <46F69224.2020003@digadd.de>
Date:	Sun, 23 Sep 2007 19:19:48 +0300
From:	"Christian P. Schmidt" <charlie@...add.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>,
	Len Brown <lenb@...nel.org>
Subject: Re: Memory allocation problem with 2.6.22 after suspend/resume cycle

Rafael J. Wysocki wrote:
> On Sunday, 23 September 2007 14:38, Christian P. Schmidt wrote:
>> Rafael J. Wysocki wrote:
>>> On Saturday, 22 September 2007 17:41, Christian P. Schmidt wrote:
>>>> Hi all,
>>>>
>>>> I'm having a strange problem, of course not reproducible. Sometimes
>>>> after a suspend (to ram) and resume cycle, the kernel will try to free
>>>> all memory. This means, all running applications are flushed to swap (as
>>>> long as it is available), caches and buffers stay at around 15MB each.
>>>>
>>>> The following video (traded quality for bandwidth) shows what happens on
>>>> the way from no swap to "swapon -a" (that's the unreadable thing in the
>>>> small shell): http://digadd.de/swapping.avi
>>>>
>>>> The system:
>>>> Linux dnnote 2.6.22.5 #1 SMP PREEMPT Sat Aug 25 18:39:21 AST 2007 x86_64
>>>> Intel(R) Core(TM)2 CPU T7400 @ 2.16GHz GenuineIntel GNU/Linux
>>> Are you using an ATI binary graphics driver?
>> Yes. I do not (yet) have a choice... can't wait for the open source drivers.
> 
> That, most probably, is the source of the problem.  Please see:
> http://bugzilla.kernel.org/show_bug.cgi?id=8943

I do however not agree with Andrew's conclusion, as the memory is not
"used", so I wouldn't expect a memory leak. As soon as I turn swapping
off everything is loaded again, and works. If there was a leak it should
use the memory, shouldn't it?
If the problem would be 100% reproducible I could try without, but as
is, I have up to two weeks with 2-3 cycles daily (sometimes more, as I
receive untraceable SERR from my PCI-E WLAN after which I do not receive
interrupts any more - only a suspend/resume cycle helps...) before the
problem occurs.

Anyway, is there a way of unloading the module temporarily without
shutting X down?

>>>> A 32bit Kernel is unable to suspend/resume at all. No idea why. dmesg
>>>> shows nothing, logs show nothing. Any ideas for debugging are welcome.
>>> Well, that's interesting.
>>>
>>> Can you try in the minimal configuration (ie. boot with init=/bin/bash,
>>> mount /sys, mount /proc and run "echo mem > /sys/power/disk)?
>> Which? the 32bit or the 64bit?
> 
> 32-bit, but please do that without the ATI driver.

Did it. As before, suspends, but when I resume, I hear the CD-ROM spin
up, the backlight comes on, and nothing more. The system is a Lenovo
Thinkpad T60 8744-4XG, BIOS 1.09.

Regards,
Christian
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