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This is the fix we went with ultimately: [1/1] RDMA/mlx5: Fix UMR hang in LAG error state unload https://git.kernel.org/rdma/rdma/c/ebc2164a4cd431 On 22/01/2026 11:36, Jian Wen wrote: > *External email: Use caution opening links or attachments* > > > Hi Maher, > > Has the fix released yet? > > Thanks. > > > Maher Sanalla >于2025年 > 10月16日 周四21:32写道： > > > > On 09/10/2025 21:02, Jason Gunthorpe wrote: > > External email: Use caution opening links or attachments > > > > > > On Thu, Oct 09, 2025 at 10:23:20PM +0800, Jian Wen wrote: > >> --- a/drivers/infiniband/hw/mlx5/umr.c > >> +++ b/drivers/infiniband/hw/mlx5/umr.c > >> @@ -254,7 +254,7 @@ static int mlx5r_umr_post_send(struct ib_qp > *ibqp, u32 mkey, struct ib_cqe *cqe, > >>        unsigned int idx; > >>        int size, err; > >> > >> -     if (unlikely(mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)) > >> +     if (unlikely(mlx5_cmd_is_down(mdev))) > >>                return -EIO; > > > > I feel like this is just changing the race around.. > > > > The removal flow for the device is different if the HW is working > than > > if it isn't. > > > > If it isn't working then the removal should disable and cancel > all the > > UMRs, using the umrc->lock. Otherwise there will be dead threads > > floating around. It should also be setting > > MLX5_DEVICE_STATE_INTERNAL_ERROR way at the start of removal. > > > > So IDK, maybe check mlx5_cmd_is_down() and trigger the flow to > > activate INTERNAL_ERROR befor doing anything else? > > > > Jason > > > > I agree with Jason concern. While this may serve as a workaround for > certain cases, the race condition still exists. We’re aware of this > issue and are working on a proper fix. The intended solution is that > when the device enters an error state, the UMR state should transition > directly to error as well, preventing any new UMRs from being posted. > > Maher >