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

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Date:	Sun, 23 Sep 2007 22:18:40 +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 18:19, Christian P. Schmidt wrote:
>> 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?
> 
> I don't know.
> 
> Can you try another version of the ATI driver?  The reporter of this bugzilla
> entry did that and it apparently helped him:
> http://bugzilla.kernel.org/show_bug.cgi?id=8943#c4

That driver is even more broken, produces artifacts all over the place.
I'll rather wait for the open source work to be done and live with the
situation.

>>>>>> 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.
> 
> Are you 100% sure that your 32-bit kernel configuration reflects the 64-bit
> one?  In particular, do you have CONFIG_NO_HZ set in the 32-bit .config?

In both, not. 1000Hz timer, SMP support, hotplug CPU support are
enabled. I attached a diff (from the 64bit to the 32bit). Maybe I'm
missing something.

> Also, would you be able to repeat this test with the latest -git kernel
> (currently 2.6.23-rc7-git4)?

Not that I'd really care about the 32bit support, but someone else will.
Also, the 32bit version has problems with the SATA DVD-RW; it hangs for
several seconds resetting the port (same kernel version, both 2.6.22.5),
while the 64bit hasn't. Funny ;)
Sadly, I know that 2.6.23 breaks/will break all the external modules I
rely on. Anyway, I'll give it a shot later.

Regards,
Chris

> Greetings,
> Rafael


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