freescale android kernel have scheduling problem !!!

cancel
Showing results for 
Search instead for 
Did you mean: 

freescale android kernel have scheduling problem !!!

Jump to solution
15,853 Views
yangaaron
Contributor III

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

Tags (1)
1 Solution
3,789 Views
qiang_li-mpu_se
NXP Employee
NXP Employee

Hi Aaron, please apply the attached two patches, from our test, the issue can be fixed.

View solution in original post

49 Replies
2,568 Views
david5icp
Contributor III

Dear All,

The scheduling problem means Android Kernel will crash anytime, anywhere when Device is running ?  Because our product also have similar problem during burn-in test.

Thanks!

David Wu

0 Kudos
2,568 Views
Chris1z
Contributor III

David,

Do you have a test that you can share that causes a crash?  Any logs?

0 Kudos
2,567 Views
david5icp
Contributor III

Sorry... I didn't in charge this issue In past few months, but i am back now...

I do the patch and test 2 devices, 1 device is normal and still running (more then 15 hr) , 1 device is stop in my test program after 15hr . The full log as attached files.

These 2 files is in same device, i just separate it. R105C-003.txt is begin form test and R105C-003-2.txt has error message as below:

---------------------------------------------------------------------------------------------------------------------

30|root@android:/ #

130|root@android:/ # BUG: scheduling while atomic: swapper/0/0x00000000

Modules linked in: dhd

[<c0052f64>] (unwind_backtrace+0x0/0x138) from [<c069296c>] (__schedule+0x828/0x

960)

[<c069296c>] (__schedule+0x828/0x960) from [<c004c714>] (cpu_idle+0xa4/0xfc)

[<c004c714>] (cpu_idle+0xa4/0xfc) from [<10689b54>] (0x10689b54)

request_suspend_state: sleep (0->3) at 56609932567084 (2014-05-06 01:43:15.82892

1065 UTC)

flashlight_control: off

dhd_early_suspend

dhd_suspend_resume_helper

---------------------------------------------------------------------------------------------------------------------

It seems still Scheduling issue...

I redo the same test with problem device again.... report it tomorrow.

BR.

David Wu

0 Kudos
2,566 Views
fabio_estevam
NXP Employee
NXP Employee
0 Kudos
2,566 Views
DraganOstojic
Contributor V

Hi Fabio, in my case, just applying this patch didn't help.

0 Kudos
2,566 Views
jiujinhong
Contributor IV

Hi Dragan,

Did you fix this issue?

0 Kudos
2,575 Views
XianzhongLi
NXP Employee
NXP Employee

"rcu_preempt_state detected stalls" could be fixed with the followng patch, please try

--- linux-3.0.35/arch/arm/plat-mxc/time.c.orig2013-12-11 09:25:29.518910709 +1300
+++ linux-3.0.35/arch/arm/plat-mxc/time.c2013-12-11 09:26:12.958912361 +1300

@@ -165,7 +165,8 @@

__raw_writel(tcmp, timer_base + V2_TCMP);

-return 0;

+        return evt < 0x7fffffff &&

+            (int)(tcmp - __raw_readl(timer_base + V2_TCN)) < 0 ? ETIME : 0;

}

#ifdef DEBUG

0 Kudos
2,575 Views
yangaaron
Contributor III

Hello , Xianzhong

I patch to our kernel and try run again on our freescale platform board ( i.mx6q , 1GB Ram , hdmi 1080p output )

Test results are as follows:
system hang up and no error message within an hour (android version 4.0.4)
system reboot and no error message within an hour    (android version 4.2.2)
system reboot and no error message about two days  (android version 4.3)

0 Kudos
2,575 Views
lily_zhang
NXP Employee
NXP Employee

Hello, Aaron:

The above patch targets to resolve the issue "rcu_preempt_state detected stalls on CPUstasks". So from your test, do you still see "CPU stall" issue?

If it's resolved, the left issue is "system reboot and no error message sometimes". Can you please try to disable Watchdog? So we can check the sitatuions in this case.

0 Kudos
2,575 Views
yangaaron
Contributor III

Hi , Xiaoli

I think it is random ~

Its system crash situation occurs in the second performance without spending too much time (android jb 4.3)

About error message I only saw "rcu_preempt_state detected stalls on CPUstasks" message on android 4.0.4  before i patching it.

system hang up and no error message after patching it (android ics 4.0.4)

usually system would be direct reboot and no any error message when running on android jb 4.2 & 4.3 (whether patch it or not)

system hang up and no error message after i disabled watchdog(android jb 4.2 & 4.3)

0 Kudos
2,575 Views
lily_zhang
NXP Employee
NXP Employee

To disable watchdog is to check the situation when the problem happens.

After reboot, it's difficult to get more useful information.

So to disable watchdog is not solution, just for debug purpose.

0 Kudos
2,575 Views
yangaaron
Contributor III

Hello , Xiaoli

Yes , I know

Thank you

0 Kudos
2,575 Views
qiang_li-mpu_se
NXP Employee
NXP Employee

I tried this APK with "maxcpus=1", then only one CPU will be loaded in kernel, and I had also disabled the WDOG, running this APK, the system still will hang up without error messages.

0 Kudos
2,575 Views
yangaaron
Contributor III

Hello, Qiang

Yes, I know ~

Before I have done similar experiments

Thanks

0 Kudos
2,575 Views
LeonardoSandova
Specialist I

Aaron, have you tried with maxcpus=0 ? this is not the same as =1, because =0 turns off SMP.

0 Kudos
2,569 Views
yangaaron
Contributor III

Hello, Leonardo

Have any update for this issue ?

Thanks~

0 Kudos
3,790 Views
qiang_li-mpu_se
NXP Employee
NXP Employee

Hi Aaron, please apply the attached two patches, from our test, the issue can be fixed.

2,567 Views
DraganOstojic
Contributor V

Hi Qiang, I can still reproduce the issue with the patch applied. In my case it's a hard hang with no message on the serial terminal or logcat. I wonder, do you have some other patch I could try?

0 Kudos
2,567 Views
qiang_li-mpu_se
NXP Employee
NXP Employee

Hi Dragan, if there is no messages output from serial terminal, your issue is not kernel schedule issue.

Did you update your GPU lib and driver to lastest 4.6.9p13? (You can search "GPU P13" in community, there's GPU update for R13.4.1, JB4.2.2, JB4.3 BSP)

0 Kudos
2,567 Views
DraganOstojic
Contributor V

Hi Qiang, please check what I did since you replied last time. Today I re-enabled 0027-ENGR00306276 on top of p13 and I get the crash. Please see attached. Do you have any other suggestions. It appears that none of the suggestions so far work.

0 Kudos