Hi Chuck,
On 05/11/2015 02:02 PM, Chuck Lever wrote:
> WARN during transport destruction if ib_dealloc_pd() fails. This is
> a sign that xprtrdma orphaned one or more RDMA API objects at some
> point, which can pin lower layer kernel modules and cause shutdown
> to hang.
I'm curious, what would cause an RDMA object to get orphaned in the first place? Is there any way to prevent that?
Anna
>
> Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> Reviewed-by: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
> Reviewed-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
> Reviewed-by: Devesh Sharma <devesh.sharma@xxxxxxxxxxxxx>
> ---
> net/sunrpc/xprtrdma/verbs.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
> index 4870d27..51900e6 100644
> --- a/net/sunrpc/xprtrdma/verbs.c
> +++ b/net/sunrpc/xprtrdma/verbs.c
> @@ -702,17 +702,17 @@ rpcrdma_ia_close(struct rpcrdma_ia *ia)
> dprintk("RPC: %s: ib_dereg_mr returned %i\n",
> __func__, rc);
> }
> +
> if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
> if (ia->ri_id->qp)
> rdma_destroy_qp(ia->ri_id);
> rdma_destroy_id(ia->ri_id);
> ia->ri_id = NULL;
> }
> - if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) {
> - rc = ib_dealloc_pd(ia->ri_pd);
> - dprintk("RPC: %s: ib_dealloc_pd returned %i\n",
> - __func__, rc);
> - }
> +
> + /* If the pd is still busy, xprtrdma missed freeing a resource */
> + if (ia->ri_pd && !IS_ERR(ia->ri_pd))
> + WARN_ON(ib_dealloc_pd(ia->ri_pd));
> }
>
> /*
>
> --
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