(gdb) bt
#0  0x00007ffff6085295 in __GI_raise (sig=sig@entry=6)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007ffff6088438 in __GI_abort () at abort.c:90
#2  0x00007ffff607e322 in __assert_fail_base (
    fmt=0x7ffff61bba40 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
    assertion=assertion@entry=0x7ffff7910e70 "handle->post_sync_tasks_cnt > 0", file=file@entry=0x7ffff7910d60 "/home/nfurmento/softs/starpu/starpu.git/src/core/dependencies/implicit_data_deps.c", line=line@entry=488, 
    function=function@entry=0x7ffff7910f30 "_starpu_unlock_post_sync_tasks")
    at assert.c:92
#3  0x00007ffff607e3d2 in __GI___assert_fail (
    assertion=0x7ffff7910e70 "handle->post_sync_tasks_cnt > 0", 
    file=0x7ffff7910d60 "/home/nfurmento/softs/starpu/starpu.git/src/core/dependencies/implicit_data_deps.c", line=488, 
    function=0x7ffff7910f30 "_starpu_unlock_post_sync_tasks") at assert.c:101
#4  0x00007ffff78bbce0 in _starpu_unlock_post_sync_tasks (
    handle=0x7fffc0001830)
    at /home/nfurmento/softs/starpu/starpu.git/src/core/dependencies/implicit_data_deps.c:488
#5  0x00007ffff78eef3f in starpu_data_release_on_node (handle=0x7fffc0001830, 
    node=0)
    at /home/nfurmento/softs/starpu/starpu.git/src/datawizard/user_interactions.c:344
---Type <return> to continue, or q <return> to quit---
#6  0x00007ffff78eef8e in starpu_data_release (handle=0x7fffc0001830)
    at /home/nfurmento/softs/starpu/starpu.git/src/datawizard/user_interactions.c:352
#7  0x00007ffff7bc59e1 in _starpu_mpi_handle_request_termination (
    req=0x7fffc0007540)
    at /home/nfurmento/softs/starpu/starpu.git/mpi/src/starpu_mpi.c:745
#8  0x00007ffff7bc6bd1 in _starpu_mpi_test_detached_requests ()
    at /home/nfurmento/softs/starpu/starpu.git/mpi/src/starpu_mpi.c:931
#9  0x00007ffff7bc7d48 in _starpu_mpi_progress_thread_func (arg=0x622a90)
    at /home/nfurmento/softs/starpu/starpu.git/mpi/src/starpu_mpi.c:1112
#10 0x00007ffff717ae0e in start_thread (arg=0x7fffb37fe700)
    at pthread_create.c:311
#11 0x00007ffff613895d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
(gdb) f 7
#7  0x00007ffff7bc59e1 in _starpu_mpi_handle_request_termination (
    req=0x7fffc0007540)
    at /home/nfurmento/softs/starpu/starpu.git/mpi/src/starpu_mpi.c:745
745                     starpu_data_release(req->data_handle);
(gdb) p *req
$1 = {_prev = 0x0, _next = 0x0, data_handle = 0x7fffc0001830, 
  datatype = 0x7ffff7167720, ptr = 0x7fffc0007830, count = 1, 
  user_datatype = 0, srcdst = 1, mpi_tag = 16001, comm = 0x604bc0, 
  func = 0x7ffff7bc324a <_starpu_mpi_irecv_data_func>, status = 0x0, 
  request = 0x7ffff716fea0, flag = 0x0, ret = 0, req_mutex = {__data = {
      __lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, 
      __spins = 0, __list = {__prev = 0x0, __next = 0x0}}, 
    __size = '\000' <repeats 39 times>, __align = 0}, req_c = {
      __lock = 0, __futex = 0, __total_seq = 0, __wakeup_seq = 0, 
      __woken_seq = 0, __mutex = 0x0, __nwaiters = 0, __broadcast_seq = 0}, 
    __size = '\000' <repeats 47 times>, __align = 0}, request_type = RECV_REQ, 
  submitted = 1, completed = 0, hh = {tbl = 0x7fffc0007720, prev = 0x0, 
    next = 0x0, hh_prev = 0x0, hh_next = 0x0, key = 0x7fffc0007578, 
    keylen = 4, hashv = 1906330307}, other_request = 0x0, detached = 1, 
  callback_arg = 0x3c4d390, 
  callback = 0x7ffff7bd25fd <_starpu_mpi_redux_data_detached_callback>, 
  size_req = 0x0}
(gdb)