read(/mnt/zfs1) is blocked by read(/mnt/zfs2)->write(/mnt/nfs4)

[thorstenhirsch]

System information

Type	Version/Name
Distribution Name	Arch Linux
Distribution Version	rolling
Kernel Version	6.6.9
Architecture	x64
OpenZFS Version	2.2.2

Describe the problem you're observing

A long-running copy job from /mnt/zfs2 to /mnt/nfs4 seems to block reading from /mnt/zfs1, which is a completely separate zfs pool on a separate device. Also the load is increasing from 1 to 5 and vmstat shows io-wait values between 20 and 50. There's no packet loss on the network and nfsstat says retrans=0.

So despite the system is in distress it seems to be regular behavior, I mean it's not caused by faulty hardware (also see dmesg output).

My setup looks like this:

• /mnt/zfs1 is pool "zfs1" on /dev/sda (slow internal smr hdd)
• /mnt/zfs2 is pool "zfs2" on /dev/sdb (slow external smr hdd, attached via USB)
• /mnt/nfs4 is an nfs v4 mount from an OpenWRT server in my LAN, the connection is 1 GBit/s, mount options on the client are (rw,noatime,vers=4.2,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=10,retrans=2,sec=sys,clientaddr=192.168.0.11,local_lock=none,addr=192.168.0.100), export options on the server are /mnt/sda1 *(rw,fsid=0,all_squash,insecure,sync,no_subtree_check)

The problem only occurs when the NFSv4 share is exported with the sync option. As soon as I switch to async the problem is gone, even dmesg stays clean.

Describe how to reproduce the problem

1. copy a huge file from /mnt/zfs2 to /mnt/nfs4
2. while still in progress try to read from /mnt/zfs1

The read operation in 2. will only start after the write operation in 1. has finished.

Include any warning/errors/backtraces from the system logs

There are no errors in dmesg, but it continually outputs the following messages, which seem to indicate that the nfs server is too slow to process the long-running copy-job adequately (but this problem shouldn't block the nfs client's access to a local zfs filesystem):

Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:31 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:34 zoidberg kernel: call_decode: 20 callbacks suppressed
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:34 zoidberg kernel: nfs: server router OK
Jan 03 00:21:38 zoidberg kernel: rpc_check_timeout: 682 callbacks suppressed
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying
Jan 03 00:21:38 zoidberg kernel: nfs: server router not responding, still trying

router is the nfs server zoidberg is the nfs client with the zfs disks

[manio]

Hi I've come across this issue after google searching for similar text messages as mine. For what is worth I have very similar problem. When the NFS client (rootless / root-over-nfs) system is under load (specifically: low memory condition, huge disk operations, creating core files when segfaults) than I've got this:

[Wed Apr 10 17:58:24 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:38 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:38 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:38 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:38 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:39 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:39 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:40 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:42 2024] rpc_check_timeout: 110 callbacks suppressed
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:45 2024] call_decode: 85 callbacks suppressed
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:45 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:47 2024] rpc_check_timeout: 70 callbacks suppressed
[Wed Apr 10 17:58:47 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:48 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:50 2024] call_decode: 85 callbacks suppressed
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:50 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:52 2024] rpc_check_timeout: 55 callbacks suppressed
[Wed Apr 10 17:58:52 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:52 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:53 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:55 2024] call_decode: 58 callbacks suppressed
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:55 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:58:58 2024] rpc_check_timeout: 99 callbacks suppressed
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:58:58 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:00 2024] call_decode: 66 callbacks suppressed
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:03 2024] rpc_check_timeout: 65 callbacks suppressed
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:04 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:04 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:04 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:05 2024] call_decode: 100 callbacks suppressed
[Wed Apr 10 17:59:05 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:06 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:09 2024] rpc_check_timeout: 69 callbacks suppressed
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:09 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:10 2024] call_decode: 58 callbacks suppressed
[Wed Apr 10 17:59:10 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:10 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:10 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:11 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:14 2024] rpc_check_timeout: 86 callbacks suppressed
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:14 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:15 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:15 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:15 2024] call_decode: 89 callbacks suppressed
[Wed Apr 10 17:59:15 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:15 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:15 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:16 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] rpc_check_timeout: 75 callbacks suppressed
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:20 2024] call_decode: 72 callbacks suppressed
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:20 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:25 2024] rpc_check_timeout: 102 callbacks suppressed
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:25 2024] call_decode: 121 callbacks suppressed
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:25 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:26 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:30 2024] call_decode: 73 callbacks suppressed
[Wed Apr 10 17:59:30 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] rpc_check_timeout: 88 callbacks suppressed
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:31 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:35 2024] call_decode: 46 callbacks suppressed
[Wed Apr 10 17:59:35 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:36 2024] rpc_check_timeout: 121 callbacks suppressed
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:36 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:37 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:41 2024] call_decode: 85 callbacks suppressed
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:41 2024] rpc_check_timeout: 61 callbacks suppressed
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:41 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:42 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 17:59:46 2024] call_decode: 124 callbacks suppressed
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 17:59:46 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 18:00:34 2024] rpc_check_timeout: 55 callbacks suppressed
[Wed Apr 10 18:00:34 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 18:00:35 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 18:00:39 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 18:00:41 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 18:00:43 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 18:00:59 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 18:01:00 2024] nfs: server 192.168.0.1 OK
[Wed Apr 10 18:01:03 2024] nfs: server 192.168.0.1 not responding, still trying
[Wed Apr 10 18:01:06 2024] nfs: server 192.168.0.1 OK

I am still trying to discover how to fix this. The root share is exported async and the exported/host filesystem is: ext4.