[Bug 282424] p9fs: filesystem starts returning 'Invalid argument' after some time

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282424

            Bug ID: 282424
           Summary: p9fs: filesystem starts returning 'Invalid argument'
                    after some time
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: lexi.freebsd@le-fay.org

bhyve guest: FreeBSD 15.0-CURRENT #2 lf/main-n269067-56dd459904b: Sat Oct 19
18:36:40 BST 2024

bhyve host: FreeBSD 15.0-CURRENT #3 lf/main-n269068-2cff93ced1d: Wed Oct 23
02:56:54 BST 2024

this is src from ~53314e34d5e8e7f781ab990805b22f7a56bc0580.  

i have a p9fs filesystem mounted into the VM from the host:

Filesystem    Size    Used   Avail Capacity  Mounted on
torrents       28T    318G     27T     1%    /data/public/Torrents

workload is qBitTorrent, which is mostly random read+write i/o on large
(~100MB+) files.  this mostly works fine, but after some time, it begins to
return an error:

root@ivy:~ # ls /data/public/Torrents/incomplete 
ls: /data/public/Torrents/incomplete: Invalid argument
root@ivy:~ # ls /data/public/Torrents/downloads 
ls: /data/public/Torrents/downloads: Invalid argument

after unmounting and re-mounting the filesystem, it works fine again briefly
but almost immediately breaks again once the workload is started.  to restore
service, i had to reboot the VM.

nothing is logged in dmesg when this happens.

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