Suspend hangs since 2.6.34

Suspend hangs since 2.6.34

[Tino Keitel]

Hi,

as of kernel 2.6.34 I sometimes get a strange hang during suspend to
RAM. After echo mem > /sys/power/state, the suspend script hangs, Xorg
eats 100% CPU, and the desktop is frozen. I can kill the script and the
computer will then suspend and resume fine. The kernel log shows
nothing interesting when the hang happens:

usblp0: removed
usbcore: deregistering interface driver dvb_usb_vp7045
dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
successfully deinitialized and disconnected.
PM: Syncing filesystems ... done.

Is this a known problem? I had rock stable suspend with 2.3.33.x. The
computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
compile a kernel with suspend debug to get more information if the hang
happens next time.

Regards,
Tino

Re: Suspend hangs since 2.6.34

[Rafael J. Wysocki]

On Wednesday, June 09, 2010, Tino Keitel wrote:
> Hi,
> 
> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> RAM. After echo mem > /sys/power/state, the suspend script hangs, Xorg
> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> computer will then suspend and resume fine. The kernel log shows
> nothing interesting when the hang happens:
> 
> usblp0: removed
> usbcore: deregistering interface driver dvb_usb_vp7045
> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> successfully deinitialized and disconnected.
> PM: Syncing filesystems ... done.
> 
> Is this a known problem?

No, it's not.

> I had rock stable suspend with 2.3.33.x. The
> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
> compile a kernel with suspend debug to get more information if the hang
> happens next time.

Yes,  please try to get more information.

Rafael

Re: Suspend hangs since 2.6.34

[Michael Tokarev]

10.06.2010 03:42, Rafael J. Wysocki пишет:
> On Wednesday, June 09, 2010, Tino Keitel wrote:
>> Hi,
>>
>> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
>> RAM. After echo mem>  /sys/power/state, the suspend script hangs, Xorg
>> eats 100% CPU, and the desktop is frozen. I can kill the script and the
>> computer will then suspend and resume fine. The kernel log shows
>> nothing interesting when the hang happens:
>>
>> usblp0: removed
>> usbcore: deregistering interface driver dvb_usb_vp7045
>> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
>> successfully deinitialized and disconnected.
>> PM: Syncing filesystems ... done.

Sounds very much like the problem I have with 2.6.34 final.  Did not
happen with 2.6.34-rc7 which suspended just fine, but happens quite
regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
attempt.  I stopped doing suspend-to-ram due to this, because it's
unreliable.  Suspend-to-disk works just fine.

>> Is this a known problem?
>
> No, it's not.
>
>> I had rock stable suspend with 2.3.33.x. The
>> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
>> compile a kernel with suspend debug to get more information if the hang
>> happens next time.

It's amd780g athlon-based machine here, with radeon graphics, also with KMS.

> Yes,  please try to get more information.

Got it ;)

/mjt

Re: Suspend hangs since 2.6.34

[Tino Keitel]

On Thu, Jun 10, 2010 at 10:05:05 +0400, Michael Tokarev wrote:

[...]

> Sounds very much like the problem I have with 2.6.34 final.  Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite

I also had this hang before -rc7.

Regards,
Tino

Re: Suspend hangs since 2.6.34

[Rafael J. Wysocki]

On Thursday, June 10, 2010, Michael Tokarev wrote:
> 10.06.2010 03:42, Rafael J. Wysocki пишет:
> > On Wednesday, June 09, 2010, Tino Keitel wrote:
> >> Hi,
> >>
> >> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> >> RAM. After echo mem>  /sys/power/state, the suspend script hangs, Xorg
> >> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> >> computer will then suspend and resume fine. The kernel log shows
> >> nothing interesting when the hang happens:
> >>
> >> usblp0: removed
> >> usbcore: deregistering interface driver dvb_usb_vp7045
> >> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> >> successfully deinitialized and disconnected.
> >> PM: Syncing filesystems ... done.
> 
> Sounds very much like the problem I have with 2.6.34 final.  Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite
> regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
> attempt.  I stopped doing suspend-to-ram due to this, because it's
> unreliable.  Suspend-to-disk works just fine.

Well, it would be helpful to check which commit between 2.6.34-rc7 and
2.6.34 final broke that for you (there were not too many commits between these
two kernels, so it shouldn't be too much work).

> >> Is this a known problem?
> >
> > No, it's not.
> >
> >> I had rock stable suspend with 2.3.33.x. The
> >> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
> >> compile a kernel with suspend debug to get more information if the hang
> >> happens next time.
> 
> It's amd780g athlon-based machine here, with radeon graphics, also with KMS.
> 
> > Yes,  please try to get more information.
> 
> Got it ;)

That still doesn't really help to diagnose the problem.

Rafael

Re: Suspend hangs since 2.6.34

[Bill Davidsen]

Michael Tokarev wrote:
> 10.06.2010 03:42, Rafael J. Wysocki пишет:
>> On Wednesday, June 09, 2010, Tino Keitel wrote:
>>> Hi,
>>>
>>> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
>>> RAM. After echo mem>  /sys/power/state, the suspend script hangs, Xorg
>>> eats 100% CPU, and the desktop is frozen. I can kill the script and the
>>> computer will then suspend and resume fine. The kernel log shows
>>> nothing interesting when the hang happens:
>>>
>>> usblp0: removed
>>> usbcore: deregistering interface driver dvb_usb_vp7045
>>> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
>>> successfully deinitialized and disconnected.
>>> PM: Syncing filesystems ... done.
> 
> Sounds very much like the problem I have with 2.6.34 final.  Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite
> regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
> attempt.  I stopped doing suspend-to-ram due to this, because it's
> unreliable.  Suspend-to-disk works just fine.
> 
>>> Is this a known problem?
>>
There are two things you can try if you wish, one is to go the text console 
before suspend, the other is to run your system in VESA video mode (assuming you 
are a lucky person and any other mode is supported).

I'm not running on 2.6.34 for production (2.6.33.5) but I did try when it first 
came out, and saw some issues there.

>> No, it's not.
>>
>>> I had rock stable suspend with 2.3.33.x. The
>>> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
>>> compile a kernel with suspend debug to get more information if the hang
>>> happens next time.
> 
> It's amd780g athlon-based machine here, with radeon graphics, also with 
> KMS.
> 
>> Yes,  please try to get more information.
> 
> Got it ;)
> 
> /mjt


-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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Re: Suspend hangs since 2.6.34

[Rafael J. Wysocki]

On Thursday, June 10, 2010, Michael Tokarev wrote:
> 10.06.2010 03:42, Rafael J. Wysocki пишет:
> > On Wednesday, June 09, 2010, Tino Keitel wrote:
> >> Hi,
> >>
> >> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> >> RAM. After echo mem>  /sys/power/state, the suspend script hangs, Xorg
> >> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> >> computer will then suspend and resume fine. The kernel log shows
> >> nothing interesting when the hang happens:
> >>
> >> usblp0: removed
> >> usbcore: deregistering interface driver dvb_usb_vp7045
> >> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> >> successfully deinitialized and disconnected.
> >> PM: Syncing filesystems ... done.
> 
> Sounds very much like the problem I have with 2.6.34 final.  Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite
> regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
> attempt.  I stopped doing suspend-to-ram due to this, because it's
> unreliable.  Suspend-to-disk works just fine.

Can you both try to do "echo 0 > /sys/power/pm_async" and check if suspend
works with that?

Rafael

Re: Suspend hangs since 2.6.34

[Maciej Rutecki]

On środa, 9 czerwca 2010 o 19:53:56 Tino Keitel wrote:
> Hi,
> 
> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> RAM. After echo mem > /sys/power/state, the suspend script hangs, Xorg
> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> computer will then suspend and resume fine. The kernel log shows
> nothing interesting when the hang happens:
> 

I created a Bugzilla entry at 
https://bugzilla.kernel.org/show_bug.cgi?id=16207
for your bug report, please add your address to the CC list in there, thanks!

-- 
Maciej Rutecki
http://www.maciek.unixy.pl

Re: Suspend hangs since 2.6.34

[Tino Keitel]

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Hi,

this nasty bug did not appear after I enabled suspend debugging first,
but now it did:

2010-06-20_22:40:31.22927 kern.info: usbcore: deregistering interface driver dvb_usb_vp7045
2010-06-20_22:40:31.24960 kern.debug: usb 1-6: __pm_runtime_resume()!
2010-06-20_22:40:31.24968 kern.debug: usb 1-6: __pm_runtime_resume() returns 1!
2010-06-20_22:40:31.24969 kern.debug: PM: Removing info for No Bus:dvb0.frontend0
2010-06-20_22:40:31.24971 kern.debug: PM: Removing info for No Bus:dvb0.net0
2010-06-20_22:40:31.24972 kern.debug: PM: Removing info for No Bus:dvb0.demux0
2010-06-20_22:40:31.24973 kern.debug: PM: Removing info for No Bus:dvb0.dvr0
2010-06-20_22:40:31.24974 kern.info: dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II) successfully deinitialized and disconnected.
2010-06-20_22:40:32.26675 kern.info: PM: Syncing filesystems ... done.
2010-06-20_22:40:32.39011 kern.debug: PM: Preparing system for mem sleep

When I killed the suspend script which hung at the echo mem >
/sys/power/state line, the computer suspended. After wakeup, the kernel
 log lines after the line above look like this:

2010-06-20_22:49:10.28745 kern.warn: Freezing user space processes ... (elapsed 0.02 seconds) done.
2010-06-20_22:49:10.28748 kern.warn: Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
2010-06-20_22:49:10.28748 kern.debug: PM: Entering mem sleep
2010-06-20_22:49:10.28749 kern.warn: Suspending console(s) (use no_console_suspend to debug)

I also attached the full kernel log since the boot.

Regards,
Tino

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