[mvapich-discuss] viarecv.c:613: viadev_eager_pull: Assertion `rhandle->vbuf_head != ((void *)0)' failed.

[Adam Moody]

Hello all,
One user's code will sometimes die with MVAPICH-1 0.9.7.  One a given 
run, it will randomly lead to one of three outcomes:
    #1)  viarecv.c:613: viadev_eager_pull: Assertion `rhandle->vbuf_head 
!= ((void *)0)' failed.
    #2)  MPI_IRECV : Invalid count argument
    #3)  the code runs without error
 From what I can tell, in case #1, the message that leads to the 
assertion failure is an unexpected eager message ~1700 bytes from an 
off-node task.  The rhandle shows that vbufs_expected=1, but both 
vbuf_head and vbuf_tail are NULL.

So far, this code runs without error in 0.9.9.  I'd like to determine 
whether 0.9.9 fixes the problem, or whether it's still out there, but 
that the new optimizations in 0.9.9 affect timings in such a way so as 
to increase our odds of avoiding it.  Are there any particular fixes in 
0.9.9 which address the race condition described above?
Thanks,
-Adam Moody
DEG/LLNL