It looks like this commit should be cherry-picked for stable branches older than 4.0:
commit 7ba0c47c34a1ea5bc7a24ca67309996cce0569b5 Author: WANG Cong <[email protected]> Date: Tue Mar 31 11:01:47 2015 -0700 ip6mr: call del_timer_sync() in ip6mr_free_table() Ben. -- Ben Hutchings For every action, there is an equal and opposite criticism. - Harrison
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