On 07/13/15 at 10:11pm, Cong Wang wrote:
> Caused by:
>
> commit 21e4902aea80ef35afc00ee8d2abdea4f519b7f7
> Author: Thomas Graf <tg...@suug.ch>
> Date: Fri Jan 2 23:00:22 2015 +0100
>
> netlink: Lockless lookup with RCU grace period in socket release
>
> Defers the release of the socket reference using call_rcu() to
> allow using an RCU read-side protected call to rhashtable_lookup()
>
> This restores behaviour and performance gains as previously
> introduced by e341694 ("netlink: Convert netlink_lookup() to use
> RCU protected hash table") without the side effect of severely
> delayed socket destruction.
>
> Signed-off-by: Thomas Graf <tg...@suug.ch>
> Signed-off-by: David S. Miller <da...@davemloft.net>
>
>
> We can't hold mutex lock in a rcu callback, perhaps we could
> defer the mmap ring cleanup to a workqueue.
The socket should be dead at this point. It might be simpler to
add a netlink_release_ring() function which doesn't require
locking at all. It would also get rid of all the special handling
for closing vs. non-closing.
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