Revision 0e8411e426e277f55bd21e287ec89fab6f8eacae authored by Hangbin Liu on 09 May 2018, 10:06:44 UTC, committed by David S. Miller on 10 May 2018, 19:40:52 UTC
After route cache is flushed via ipv4_sysctl_rtcache_flush(), we forget
to reset fnhe_mtu_locked in rt_bind_exception(). When pmtu is updated
in __ip_rt_update_pmtu(), it will return directly since the pmtu is
still locked. e.g.

+ ip netns exec client ping 10.10.1.1 -c 1 -s 1400 -M do
PING 10.10.1.1 (10.10.1.1) 1400(1428) bytes of data.
>From 10.10.0.254 icmp_seq=1 Frag needed and DF set (mtu = 0)

Signed-off-by: David S. Miller <davem@davemloft.net>
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