I noticed the other acl tests are behaving weirdly, there are a lot of packets returned:

ll /tmp/vpp-unittest-TestMACIP-o7xvWO -h
total 2.2G
drwx------ 2 jlinkes jlinkes 4.0K Sep 13 06:54 ./
drwxrwxrwt 27 root root 32K Sep 13 07:04 ../
rw-rw-r- 1 jlinkes jlinkes 82 Sep 13 06:54 history.[timestamp:1536846887.229728].[pg3-counter:0000].pg3_in.pcap
rw-rw-r- 1 jlinkes jlinkes 82 Sep 13 06:54 history.[timestamp:1536846887.240244].[pg3-counter:0000].pg3_out.pcap
rw-rw-r- 1 jlinkes jlinkes 100K Sep 13 06:54 log.txt
rw-rw-r- 1 jlinkes jlinkes 86 Sep 13 06:54 pg1_in.pcap
rw-rw-r- 1 jlinkes jlinkes 2.2G Sep 13 07:04 pg1_out.pcap
rw-rw-r- 1 jlinkes jlinkes 126 Sep 13 06:54 pg3_in.pcap
rw-rw-r- 1 jlinkes jlinkes 126 Sep 13 06:54 pg3_out.pcap
srwxrwxr-x 1 jlinkes jlinkes 0 Sep 13 06:54 stats.sock=

I tried this with and without the patch and it happened in both cases. I didn't see this on x86.

Will update the ticket if I uncover more relevant info.