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Stall on CPU Error?

post #1 of 5
Thread Starter 
Hey Guy,

So I thought I had a stable OC. I ran it under prime blend for 18hrs and have been folding for almost 2 weeks. In the last 2-3 days Ive gotten this message on my VM twice.. Once it was CPU 5 and CPU 4.. Now it was just CPU 5. Copied below is the error message.


rcu_sched_state detected stall on CPU 5 (t=1 jiggies)


So what exactly does it mean? I figured its the same thing as if a core would fail while running prime.. That its not stable and I should up the vcore another .005v.. But I figured I would ask the pros.. YOU GUYS!

Let me know.. So far Ive just been restarting my VM, but I think im taking a dip on PPD everytime it fails.

Thanks for the help
post #2 of 5

All I could find:

http://www.mjmwired.net/kernel/Documentation/RCU/stallwarn.txt

 

Quote:

When a CPU detects that it is stalling, it will print a message similar to the following:
 
INFO: rcu_sched_state detected stall on CPU 5 (t=2500 jiffies)
 
This message indicates that CPU 5 detected that it was causing a stall, and that the stall was affecting RCU-sched.  This message will normally be followed by a stack dump of the offending CPU.  On TREE_RCU kernel builds, RCU and RCU-sched are implemented by the same underlying mechanism, while on TREE_PREEMPT_RCU kernel builds, RCU is instead implemented by rcu_preempt_state.

 

And no... I don't have a clue what that means. :P

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post #3 of 5
I got this error on a 6900 last week and when it completed and uploaded, Stanford did not score it.
 
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post #4 of 5
Quote:
Originally Posted by zodac View Post

All I could find:
http://www.mjmwired.net/kernel/Documentation/RCU/stallwarn.txt


And no... I don't have a clue what that means. tongue.gif

Stalling is basically a core waiting because it needs information that has not been processed on another core. This could be something that is unrelated to the folding in a way because it is an error in linux and not the folding client. Although it would probably not have happened had you not been folding on it.


I would say that it could be caused by a bad install of the virtual OS/or a bad version of the OS, an unstable overclock, or just a funky WU. If you notice a pattern of WUs or other factors that cause this that might help track the exact problem down. My first suggestion would be a install of a different Linux version (if you are not running one suggested by the many guides on this forum).
post #5 of 5
I would not do anything rash at this point. Just keep an eye on it. It is a 1 off type of error you really cannot pinpoint. I folded for 60 days before I got the error, but I believe mine was due to taking my BCLK from 100 to 102. The CPU clock was lower after that adjustment because I reduced the multi, but something did not work right despite it folding fine at 102 for 48 hours.
 
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