freescale android kernel have scheduling problem !!!

[yangaaron]

I wrote a very simple Android application(AndroidGLSurfaceViewActivity.apk).mainly use opengl use muti-thread to draw frame on the screen

I tried to run on the freescale platform ( i.mx6q , 1GB Ram , android 4.0.4 , hdmi 1080p output )

It can't run more than one hour will cause the system to crash. (Kernel panic or rcu_preempt_state detected stalls on CPUs/tasks).

but it can run all night on the Android Emulator and Samsung Galaxy Note 8.0

PS : Android apk and program source code and detailed error messages, see attached file

Original Attachment has been moved to: rcu_preempt_state-detected-stalls-on-CPUstasks.txt.zip

Original Attachment has been moved to: AndroidGLSurfaceViewActivity.apk.zip

Original Attachment has been moved to: AndroidGLSurfaceViewActivity.7z.zip

Original Attachment has been moved to: Kernel-panic--not-syncing-Fatal-exception.txt.zip

[xiaoqianlin]

This issue can be duplicated on MX6SDP JB4.2.2_1.1.0. I attached the log.

[xiaoqianlin]

I  tested this issue on JB4.3_1.1.0, this issue still can be duplicated

[Chris1z]

We have also seen similar crashes on our product that is based on SabreSD iMX6Q jb4.2.2-1.1.0-ga release with 2GB of memory.  Kernel panics with a NULL pointer dereference or " rcu_preempt_state detected stalls".  I ran your tests on our boards and saw the kernel panic a couple of times.  I also saw sometimes the app would freeze and I would have stop and start it again.

I also tried your test on a few of our SabreSd (Rev C1 and Rev C2) boards.  I didn't see the same specific kernel panic or rcu stall yet, but they did reboot a couple of times without any logs.  The OOM killer seems to kick in pretty quickly too, maybe because SabreSd only has 1GB.

I am running a newer version of Android (and probably the kernel) than you.  But regardless, your test does definitely reveals some issues on the iMX6. 

Someone from Freescale please comment.

[yangaaron]

Yes .  similar result with your when I upgrade our platform to android 4.2.2 .

it will reboot system and without any error logs in one hour.

i think seems to be a watchdog role because the kernel no response
.

[LeonardoSandova]

Aaron, Chris

The issue has been escalated. Yesterday I tried on latest JB (4.3). and the issue is present. I am not an Android expert so I can not provide any useful insight for the moment.

Aaron,

on the other thread you created, just to avoid confusion, post a comment indicating that the updates will be done on this thread, which is the original.

Leo

[LeonardoSandova]

aaronyang please mark it as 'unanswered'.

[yangaaron]

ok,   i will open an new topic "freescale android kernel have scheduling problem ?"

Please reply as soon as possible solutions to the problem

thanks~

[Chris1z]

aaronyang I think Leo just wanted you to mark this topic an "unanswered" so Freescale users will know to look at it. Thanks.

[yangaaron]

hello , chris1z

I know - but I do not see unmark option on this page .