rcu_preempt issue

[57063778]

Hi,all

    I am facing a Linux kernel dump issue after running about 48 hours. The BSP is Yocto with Linux 3.14.28 and the CPU is imx6Q. The dump information is as follow and how to fix the issue? Thanks in advance.

Dec 5 05:36:35 linux user.err kernel: INFO: rcu_preempt detected stalls on CPUs/tasks: { 2} (detected by 1, t=2102 jiffies, g=45107986, c=45107985, q=5227)
Dec 5 05:36:35 linux user.info kernel: Task dump for CPU 2:
Dec 5 05:36:35 linux user.info kernel: grep R running 0 1231 1228 0x00000002
Dec 5 05:36:35 linux user.warn kernel: [<80716800>] (__schedule) from [<a9c94020>] (0xa9c94020)

[57063778]

Hi igor,

   Thanks for your reply.

   Will the linux "https://source.codeaurora.org/external/imx/linux-imx -b imx_4.14.78_1.0.0_ga" fix the RCU issue? Or which version can fix the issue?

[igorpadykov]

Hi

please try latest described on nxp official software page

https://www.nxp.com/support/developer-resources/run-time-software/i.mx-developer-resources/i.mx-6ser...

Best regards
igor

[57063778]

Hi igorpadykov,

    The URL"https://www.nxp.com/support/developer-resources/run-time-software/i.mx-developer-resources/i.mx-6ser..." always redirect to "i.MX Software|NXP ". And I can not get the right information. Would you please send the according material to my email: xuyongxian@kehua.com.  Thank you very much.

[igorpadykov]

Hi 57063778@qq.com 

actually it is the same link, you can find all relevant documentation on

i.MX Software|NXP 

Best regards
igor

[igorpadykov]

please try for example with L4.9.88 :

https://source.codeaurora.org/external/imx/linux-imx/tree/?h=imx_4.9.88_2.0.0_ga

https://www.nxp.com/webapp/Download?colCode=L4.9.88_2.0.0_LINUX_DOCS 

Best regards
igor

[igorpadykov]

Hi

usually rcu_preempt errors happen due to arm/gpu bugs which were fixed in later nxp

linux releases (they are documented in Release Notes found on below link)

i.MX Software|NXP 

Best regards
igor
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