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[ Upstream commit efda760fe95ea15291853c8fa9235c32d319cd98 ]
As reported by David Jeffery: "a signal was sent to lockd while lockd
was shutting down from a request to stop nfs. The signal causes lockd
to call restart_grace() which puts the lockd_net structure on the grace
list. If this signal is received at the wrong time, it will occur after
lockd_down_net() has called locks_end_grace() but before
lockd_down_net() stops the lockd thread. This leads to lockd putting
the lockd_net structure back on the grace list, then exiting without
anything removing it from the list."
So, perform the final locks_end_grace() from the the lockd thread; this
ensures it's serialized with respect to restart_grace().
Reported-by: David Jeffery <djeffery@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
f1d74fa2db