On 12/18/2021 11:25 PM, Chuck Lever III wrote:
NFS/RDMA with an NFS client using mlx5-based hardware triggers a
system deadlock (no error messages) on the client. I bisected to
f0ae4afe3d35 ("RDMA/mlx5: Fix releasing unallocated memory in
dereg MR flow").
--
Chuck Lever
Hi Chuck,
I found some bug in the cited commit. Can you please test if the below
patch fixes this deadlock ?
diff --git a/drivers/infiniband/hw/mlx5/mr.c
b/drivers/infiniband/hw/mlx5/mr.c
index 157d862fb864..3cb4e34fe199 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1978,7 +1978,7 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr, struct
ib_udata *udata)
return rc;
}
- if (mr->umem) {
+ if (udata && mr->umem) {
bool is_odp = is_odp_mr(mr);
if (!is_odp)
