[Bug 251347] NFS hangs on client side when mounted from outside in Jail Tree (BROKEN NFS SERVER OR MIDDLEWARE)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251347

Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib at FreeBSD.org

--- Comment #5 from Konstantin Belousov <kib at FreeBSD.org> ---
First, switch to 12.2.  There were fixes for some NFS client issues that might
be
relevant (could be not).

I am sure that NFS client is not VNET-aware, i.e. it does not switch context
to the proper VNET as needed.  Esp. when offloading async io to nfsiod daemons.
In other words, I do not expect the scenario 3 to work.

For the second scenario, nullfs remount of NFS mount, VNET jail should be
irrelevant.  When the hang occurs, gather the procstat -kk -a output (on the
host).  Also it might worth a try to '-o nocache' for nullfs mounts, I remember
there were some problems with nullfs+nfs+caching.

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