Hi,
Reference is the v1.5 branch
If an SRQ has the following settings: S,<size>,4,2,1
1) setup_qps() sets the following:
mca_btl_openib_component.qp_infos[qp].u.srq_qp.rd_num=4
mca_btl_openib_component.qp_infos[qp].u.srq_qp.rd_init=rd_num/4=1
2) create_srq() sets the following:
openib_btl->qps[qp].u.srq_qp.rd_curr_num = 1 (rd_init value)
openib_btl->qps[qp].u.srq_qp.rd_low_local = rd_curr_num - (rd_curr_num
>> 2) = rd_curr_num = 1
3) if mca_btl_openib_post_srr() is called with rd_posted=1:
rd_posted > rd_low_local is false
num_post=rd_curr_num-rd_posted=0
the loop is not executed
wr is never initialized (remains NULL)
wr->next: address not mapped
==> SIGSEGV
The attached patch solves the problem by ensuring that we'll actually
enter the loop and leave otherwise.
Can someone have a look please: the patch solves the problem with my
reproducer, but I'm not sure the fix covers all the situations.
Regards,
Nadia
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