I'm still working on the bisect.  It looks like two commits may have
introduced the bug, which is slowing the bisect process.

I found that the following commit causes a kernel trace with rtmsg_ifa
as the EIP:

120645513f55 ("openvswitch: Add eventmask support to CT action.")

Reverting this commit allows the tests to work just fine in v4.12, which
freeze without the revert.  This is allowing me to bisect into newer
kernel versions now.

I'm bisecting further now to identify the commit that is causing the
trace with igmp_group_dropped as the EIP.

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https://bugs.launchpad.net/bugs/1736390

Title:
  openvswitch: kernel oops destroying interfaces on i386

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