A combination of two commits seems to resolve this bug:
596cf3fe5854 ("netfilter: ipset: fix race condition in ipset save, swap and
delete")
e5173418ac59 ("netfilter: ipset: Fix race between dump and swap")
I built a Xenial test kernel with these two commits. The test kernel can be
downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1793753
Can you test this kernel and see if it resolves this bug?
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https://bugs.launchpad.net/bugs/1793753
Title:
kernel panic - null pointer dereference on ipset operations
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