Hi Daniel or Frank, We spoke about this issue on weekly call just over a week ago. I remember Daniel's advice on that call was to dig into the Ganesha core dump and try to extract the communication channel for each fd from the svc_rqst_epoll_loop() calls and verify that the UDP listen socket for NFS is being epoll'd on. I'm not sure however, the data is present in that stack that would actually allow us to make that call. (gdb) bt full #0 0x00007f3c46616eb3 in epoll_wait () from /lib64/libc.so.6 No symbol table info available. #1 0x00007f3c4876f04c in svc_rqst_epoll_loop (sr_rec=0x4ae8c10) at /<redacted>/libntirpc/src/svc_rqst.c:1013 cc = 0x7f3c46d13eb4 <pthread_cond_timedwait@@GLIBC_2.3.2+516> n = 0x0 ts = {tv_sec = 2750901, tv_nsec = 954488941} timeout_ms = 29000 expire_ms = -1544065341 n_events = 32572 __func__ = "svc_rqst_epoll_loop" #2 0x00007f3c4876f199 in svc_rqst_run_task (wpe=0x4ae8c10) at /<redacted>libntirpc/src/svc_rqst.c:1065 sr_rec = 0x4ae8c10 finished = false __func__ = "svc_rqst_run_task" #3 0x00007f3c48777dca in work_pool_thread (arg=0x7f3c300008c0) at /<redacted>/libntirpc/src/work_pool.c:181 wpt = 0x7f3c300008c0 pool = 0x7f3c48993940 <svc_work_pool> have = 0x0 ts = {tv_sec = 1608803814, tv_nsec = 833467718} rc = 0 spawn = false __func__ = "work_pool_thread" #4 0x00007f3c46d0fea5 in start_thread () from /lib64/libpthread.so.0 No symbol table info available. #5 0x00007f3c466168dd in clone () from /lib64/libc.so.6 No symbol table info available. I am assuming that you would need to chenck the xp_type member in the SVCXPRT structure? However, the members of the latter are lost in the stack since during rearm, we obtain the sr_rec as follows: int svc_rqst_rearm_events(SVCXPRT *xprt) { struct rpc_dplx_rec *rec = REC_XPRT(xprt); struct svc_rqst_rec *sr_rec = (struct svc_rqst_rec *)rec->ev_p; Here, ev_p is a pointer and it seems to me we will not be able to obtain rec from *sr_rec with a container_of() kind macro since ev_p is not being referenced. Do you have another way to ascertain if the FDs polled have the UDP descriptor in them? Thanks, Anirban