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Bug
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Resolution: Duplicate
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Undefined
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None
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rhel-10.0.z
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None
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None
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Low
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rhel-fs
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None
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False
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False
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None
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None
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None
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None
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Unspecified
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Unspecified
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Unspecified
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None
What were you trying to do that didn't work?
When the sunrpc pool_mode is set to percpu, nfsd never responds to RPCs
What is the impact of this issue to you?
Prevents use of nfs server when pool_mode is percpu
Please provide the package NVR for which the bug is seen:
kernel 6.12.0-55.9.1.el10_0.x86_64 (all RHEL 10 kernels likely)
How reproducible is this bug?:
easy
Steps to reproduce
# systemctl stop nfs-server.service # echo percpu > /sys/module/sunrpc/parameters/pool_mode # systemctl start nfs-server.service # mount 127.0.0.1:/ /mnt
Expected results
nfs server responds and exports can be mounted
Actual results
nfsd never responds
packet capture:
1 0.000000000 127.0.0.1 → 127.0.0.1 TCP 76 965 → 2049 [SYN] Seq=0 Win=65495 Len=0 MSS=65495 SACK_PERM TSval=2469593584 TSecr=0 WS=128
2 0.000033392 127.0.0.1 → 127.0.0.1 TCP 76 2049 → 965 [SYN, ACK] Seq=0 Ack=1 Win=65483 Len=0 MSS=65495 SACK_PERM TSval=2469593584 TSecr=2469593584 WS=128
3 0.000072003 127.0.0.1 → 127.0.0.1 TCP 68 965 → 2049 [ACK] Seq=1 Ack=1 Win=65536 Len=0 TSval=2469593584 TSecr=2469593584
4 0.000148705 127.0.0.1 → 127.0.0.1 NFS 112 V4 NULL Call
5 0.000165384 127.0.0.1 → 127.0.0.1 TCP 68 2049 → 965 [ACK] Seq=1 Ack=45 Win=65536 Len=0 TSval=2469593584 TSecr=2469593584
6 62.952160293 127.0.0.1 → 127.0.0.1 TCP 68 [TCP Keep-Alive] 965 → 2049 [ACK] Seq=44 Ack=1 Win=65536 Len=0 TSval=2469656536 TSecr=2469593584
7 62.952227444 127.0.0.1 → 127.0.0.1 TCP 68 [TCP Keep-Alive ACK] 2049 → 965 [ACK] Seq=1 Ack=45 Win=65536 Len=0 TSval=2469656536 TSecr=2469593584
8 62.952379818 127.0.0.1 → 127.0.0.1 NFS 112 [RPC retransmission of #4]V4 NULL Call
9 62.952402400 127.0.0.1 → 127.0.0.1 TCP 68 2049 → 965 [ACK] Seq=1 Ack=89 Win=65536 Len=0 TSval=2469656536 TSecr=246965653
rpcdebug for rpc and nfsd (when mounting from other host to eliminate nfs client functions):
Oct 29 15:00:42 vm30 kernel: svc_pool_stats_start, *pidx=0 Oct 29 15:00:42 vm30 kernel: svc_pool_stats_next, *pos=0 Oct 29 15:00:42 vm30 kernel: svc_pool_stats_next, *pos=1 Oct 29 15:00:42 vm30 kernel: svc_pool_stats_next, *pos=2 Oct 29 15:00:42 vm30 kernel: svc_pool_stats_start, *pidx=3
the sole ftrace event for sunrpc or nfsd:
<idle>-0 [001] ..s2. 4830.612964: svc_xprt_enqueue: server=0.0.0.0:2049 client= flags=BUSY|CONN|CHNGBUF|LISTENER|CACHE_AUTH|CONG_CTRL
