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92-L8XLCzP6ZIiSmoTNvl-H1BuDKcYmZ X-Proofpoint-ORIG-GUID: 92-L8XLCzP6ZIiSmoTNvl-H1BuDKcYmZ On 3/4/25 9:43 PM, Li Nan wrote: > We found a following problem in kernel 5.10, and the same problem should > exist in mainline: > > During NFS mount using 'soft' option over RoCE network, we observed kernel > crash with below trace when network issues occur (congestion/disconnect): >   nfs: server 10.10.253.211 not responding, timed out >   BUG: kernel NULL pointer dereference, address: 00000000000000a0 >   RIP: 0010:frwr_unmap_sync+0x77/0x200 [rpcrdma] >   Call Trace: >    ? __die_body.cold+0x8/0xd >    ? no_context+0x155/0x230 >    ? __bad_area_nosemaphore+0x52/0x1a0 >    ? exc_page_fault+0x2dc/0x550 >    ? asm_exc_page_fault+0x1e/0x30 >    ? frwr_unmap_sync+0x77/0x200 [rpcrdma] >    xprt_release+0x9e/0x1a0 [sunrpc] >    rpc_release_resources_task+0xe/0x50 [sunrpc] >    rpc_release_task+0x19/0xa0 [sunrpc] >    rpc_async_schedule+0x29/0x40 [sunrpc] >    process_one_work+0x1b2/0x350 >    worker_thread+0x49/0x310 >    ? rescuer_thread+0x380/0x380 >    kthread+0xfb/0x140 > > Problem analysis: > The crash happens in frwr_unmap_sync() when accessing req->rl_registered > list, caused by either NULL pointer or accessing freed MR resources. > There's a race condition between: > T1 > __ib_process_cq >  wc->wr_cqe->done (frwr_wc_localinv) >   rpcrdma_flush_disconnect >    rpcrdma_force_disconnect >     xprt_force_disconnect >      xprt_autoclose >       xprt_rdma_close >        rpcrdma_xprt_disconnect >         rpcrdma_reqs_reset >          frwr_reset >           rpcrdma_mr_pop(&req->rl_registered) > T2                    > rpc_async_schedule >  rpc_release_task >   rpc_release_resources_task >    xprt_release >     xprt_rdma_free >      frwr_unmap_sync >       rpcrdma_mr_pop(&req->rl_registered) >                     > This problem also exists in function rpcrdma_mrs_destroy(). > Dai, is this the same as the system test problem you've been looking at? -- Chuck Lever