INFO: possible recursive locking detected - #1

"Jóhann B. Guðmundsson" johannbg at
Wed May 5 04:55:51 UTC 2010

On 05/05/2010 12:36 AM, James Laska wrote:
> Greetings,
> While running through tests in the installation matrix
> (,
> I keep seeing different versions of the "INFO: possible recursive
> locking detected" message.  For example, I see the below during
> successful completion of a KVM guest install (see below).
> Is anyone else seeing these?  Anyone have tips/suggestions on where to
> gather more information to further diagnose these messages?

I think this all started with this happy new year commit..;a=commitdiff;h=846f99749ab68bbc7f75c74fec305de675b1a1bf

When I shutdown I get "K99cpuspeed is trying to acquire lock" one (  
which I actually think might be cpu(freq) specific since I've only seen 
it my lenovo laptop )
( Both have been reported upstream I think and our bugzilla ).

If this was some kind of targeted effort finding these deadlocks, the 
kernel guys they would have asked us to throw up a special wiki page and 
a tracker bug to keep tap of this stuff sometime in January..

Other than that I think these are slowly being handle on a case by case 

Good think for reporters to keep in the back of their head if they are 
having trouble seeing the print k message.
echo N > /proc/sys/kernel/printk_delay ( N is 0-10000 in milliseconds ).

Kernel guys can chime what their end game is and what they want to do 
with these..


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