I have found that scatter/gather NIC features on server can affect the
behavor described above - just disabled them on server:
# my primary iface is eth1.
# here below is a stanza in a server host "interfaces" config
# that requires ethtool be installed
# the same as "ethtool -K eth1 sg on"
auto eth1
iface eth1 inet manual
offload-sg off
I am not sure that this can fix a problem or simply hide, please test it
on your servers and respond. But surely, fix does not affect client
side, and excuse hard kernel oop reaction to error in packets from
server connections.
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https://bugs.launchpad.net/bugs/769927
Title:
Kernel Oops : Dentry still in use (1) [unmount of nfs4 0:1d]
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