Re: Recursion bug in -rt

Dinakar,
	can you try patch-2.6.15-rc7-rt3-rf1  on  
http://source.mvista.com/~dsingleton/ and see if it works for your 
tests?

	This new patch creates a 'futex_deadlock' semaphore that we hang 
applications that
are deadlocking themselves.    This method will only hang the 
application, not the system,
as no other locks are held, like the mmap_sem,  just the futex_deadlock 
semaphore.

	NOTE: for pthread_mutexes  that are robust but NOT POSIX priority 
inheriting I return -EWOULDDEADLOCK,
since there is no POSIX specfication for robust pthread_mutexes yet.    
POSIX PI pthread_mutexes will hang
on the futex_deadlock semaphore.

	Let me know how it works.

David

On Dec 20, 2005, at 7:50 AM, Dinakar Guniguntala wrote:

> On Tue, Dec 20, 2005 at 02:19:56PM +0100, Ingo Molnar wrote:
>>
>> hm, i'm looking at -rf4 - these changes look fishy:
>>
>> -       _raw_spin_lock(&lock_owner(lock)->task->pi_lock);
>> +       if (current != lock_owner(lock)->task)