> On the same server I execute the rdma_server and rdma_client. The
> first is waiting incoming message. The second one segfault. This is
> the backtrace of the rdma_client:
> #0  0x00007f3de011482d in ?? () from /usr/lib/libmlx4-rdmav2.so
> #1  0x00007f3de011640e in ?? () from /usr/lib/libmlx4-rdmav2.so
> #2  0x00007f3de0a94244 in __ibv_modify_qp (qp=0x2458d40, attr=0x0,
> attr_mask=57) at src/verbs.c:474

The attr parameter doesn't look right.  ucma_init_conn_qp calls ibv_modify_qp 
using an &attr parameter from the stack.  The attr_mask looks like it could be 
correct.

Can you try updating the libmlx4 library and see if you get the same resuls?

- Sean
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