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authorJ. Bruce Fields <bfields@redhat.com>2017-03-29 04:25:08 +0300
committerJ. Bruce Fields <bfields@redhat.com>2017-05-09 01:06:18 +0300
commitefda760fe95ea15291853c8fa9235c32d319cd98 (patch)
tree2769a42950ce9704f3a3c7b9fd9a61b4426d7d30 /fs/lockd/clntproc.c
parented6473ddc704a2005b9900ca08e236ebb2d8540a (diff)
downloadlinux-efda760fe95ea15291853c8fa9235c32d319cd98.tar.xz
lockd: fix lockd shutdown race
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>
Diffstat (limited to 'fs/lockd/clntproc.c')
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