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uclinux, bf561 SMP, Sporadic freeze of processes

Question asked by sidse on Aug 28, 2014
Latest reply on Aug 31, 2014 by Aaronwu

Hi

We have a very strange problem.

Occasionally some processes seems to be suspended.

This sleep may be interrupted by a new ssh or telnet session, by a system call (ps, top, cat /proc/xx,),

or when the ethernet cable is plugged off and in again.

Then the processes are "resumed" and are working normal

So it is rather hard to find out the erratic state, when any system interaction recovers the sleep.

**

Further observations:

- The linux hung task detection [khungtaskd] doesn't notice anyting.

- The dmesg hasn't an entry as well

- It happens very soon when the cpu works on high load.

- No powersave features are activated.

 

I played around with kernel configurations, and added printk, but without success.

 

Have somebody an idea, what could be wrong?

 

Thank you very much

 

Roman

 

** details of sources

blackfin-buildroot-2013R1-RC1

make bf561-ezkit-smp_defconfig

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