[Starpu-devel] starpu_data_unregister() failing at pthread_spin_unlock()

[Jonathan Adamczewski <jadamcze@utas.edu.au>]

I have been unable to extract a simple test case for this - I'll explain as 
best as I can. I'm using svn trunk and using OpenCL only under WinXP.

I have a function that registers an array of variables through a loop like :
   
    starpu_data_handle *data_handles = [allocated chunk of memory];
    uintptr_t varsint = (uintptr_t)[address of vars];
    for(unsigned int i = 0; i < argnumber; ++i) { // argnumber = 2
        starpu_variable_data_register(&data_handles[i], 0, varsint, var_size);
        vars += var_size; // var_size = 4
    }

These are later added to a task struct:

    for(unsigned int i = 0; i < argnumber; ++i) { // argnumber = 2
        task->buffers[i].handle = data_handles[i];
        task->buffers[i].mode = STARPU_RW;
    }

The task is submitted, and the args are set for the cl kernel in the set 
OpenCL function:

    for(unsigned int i = 0; i < argnumber; ++i) { // argnumber = 2
        clSetKernelArg(kernel, i, STARPU_VARIABLE_GET_ELEMSIZE(buffer[i]),
                              &STARPU_VARIABLE_GET_PTR(buffer[i]));
    }

The kernel runs and I attempt to unregister the variables to have their 
changed values copied back to the local buffer:

    for(unsigned int i = 0; i < argnumber; ++i) { // argnumber = 2
        starpu_data_unregister(data_handles[i]);
    }

The first variable is unregistered without problem - I see the correct result 
in memory.

Unregistering the second variable causes an assert to fail in 
_starpu_spin_unlock() - the assert checking the return value of 
pthread_spin_unlock() fails. According to gdb, lock->lock contains the value 
0xfeeefeee, which looks rather suspicious.

Suggestions of things to consider or check for would be appreciated, thanks.

Jonathan.