I have tracked down the problem to multiple calls to the zerocopy callback for the same ubuf_info. I am not sure exactly which patch introduced the issue but my suspicion is that it was one of the the MSG_ZEROCOPY series (see https://marc.info/?l=linux-netdev&m=149807997726733&w=2). I have a candidate patch to netback to make use of the ubuf_info ref count to handle the multiple callbacks and that certainly fixes the issue for me. I'll post this shortly recommending a backport to stable.
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