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Mounted from device: 192.168.0.105:/hs_test >> dt (j:1 t:1): Mounted on directory: /mnt/hs_test >> dt (j:1 t:1): Filesystem type: nfs4 >> dt (j:1 t:1): Filesystem options: rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,fatal_neterrors=none,proto=tcp,nconnect=16,port=20491,timeo=600,retrans=2,sec=sys,clientaddr=192.168.0.106,local_lock=none,addr=192.168.0.105 > > I haven't been able to reproduce a similar failure in my lab with > NFSv4.2 over RDMA with FDR InfiniBand. I've run dt 6-7 times, all > successful. Also, for shit giggles, I tried the fsx-based subtests in > fstests, no new failures there either. The export is xfs on an NVMe > add-on card; server uses direct I/O for READ and page cache for WRITE. > > Notice the mount options for your test run: "proto=tcp" and > "nconnect=16". Even if your network fabric is RoCE, "proto=tcp" will > not use RDMA at all; it will use bog standard TCP/IP on your ultra > fast Ethernet network. > > What should I try next? I can apply 2/2 or add "nconnect" or move the > testing to my RoCE fabric after lunch and keep poking at it. > > Or, I could switch to TCP. Suggestions welcome. The client is not sending any READ procedures/operations to the server. The following is NFSv3 for clarity, but NFSv4.x results are similar: nfsd-1669 [003] 1466.634816: svc_process: addr=192.168.2.67 xid=0x7b2a6274 service=nfsd vers=3 proc=NULL nfsd-1669 [003] 1466.635389: svc_process: addr=192.168.2.67 xid=0x7d2a6274 service=nfsd vers=3 proc=FSINFO nfsd-1669 [003] 1466.635420: svc_process: addr=192.168.2.67 xid=0x7e2a6274 service=nfsd vers=3 proc=PATHCONF nfsd-1669 [003] 1466.635451: svc_process: addr=192.168.2.67 xid=0x7f2a6274 service=nfsd vers=3 proc=GETATTR nfsd-1669 [003] 1466.635486: svc_process: addr=192.168.2.67 xid=0x802a6274 service=nfsacl vers=3 proc=NULL nfsd-1669 [003] 1466.635558: svc_process: addr=192.168.2.67 xid=0x812a6274 service=nfsd vers=3 proc=FSINFO nfsd-1669 [003] 1466.635585: svc_process: addr=192.168.2.67 xid=0x822a6274 service=nfsd vers=3 proc=GETATTR nfsd-1669 [003] 1470.029208: svc_process: addr=192.168.2.67 xid=0x832a6274 service=nfsd vers=3 proc=ACCESS nfsd-1669 [003] 1470.029255: svc_process: addr=192.168.2.67 xid=0x842a6274 service=nfsd vers=3 proc=LOOKUP nfsd-1669 [003] 1470.029296: svc_process: addr=192.168.2.67 xid=0x852a6274 service=nfsd vers=3 proc=FSSTAT nfsd-1669 [003] 1470.039715: svc_process: addr=192.168.2.67 xid=0x862a6274 service=nfsacl vers=3 proc=GETACL nfsd-1669 [003] 1470.039758: svc_process: addr=192.168.2.67 xid=0x872a6274 service=nfsd vers=3 proc=CREATE nfsd-1669 [003] 1470.040091: svc_process: addr=192.168.2.67 xid=0x882a6274 service=nfsd vers=3 proc=WRITE nfsd-1669 [003] 1470.040469: svc_process: addr=192.168.2.67 xid=0x892a6274 service=nfsd vers=3 proc=GETATTR nfsd-1669 [003] 1470.040503: svc_process: addr=192.168.2.67 xid=0x8a2a6274 service=nfsd vers=3 proc=ACCESS nfsd-1669 [003] 1470.041867: svc_process: addr=192.168.2.67 xid=0x8b2a6274 service=nfsd vers=3 proc=FSSTAT nfsd-1669 [003] 1470.042109: svc_process: addr=192.168.2.67 xid=0x8c2a6274 service=nfsd vers=3 proc=REMOVE So I'm probably missing some setting on the reproducer/client. /mnt from klimt.ib.1015granger.net:/export/fast Flags: rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard, fatal_neterrors=none,proto=rdma,port=20049,timeo=600,retrans=2, sec=sys,mountaddr=192.168.2.55,mountvers=3,mountproto=tcp, local_lock=none,addr=192.168.2.55 Linux morisot.1015granger.net 6.15.10-100.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Aug 15 14:55:12 UTC 2025 x86_64 GNU/Linux -- Chuck Lever