Seen on master, commit cf7efe01e791fd1aa688624194e6e2ffffd8f97f

See the attached logs for details of what went wrong and an attempt at providing some debug info from the core.

The tests exhibit similar behavior, so I included them all into one ticket. One of the tests in L2XC produced a core dump.

There's also a SPAN crash that's most likely related: https://jira.fd.io/browse/VPP-1434

The SPAN crash happens in l2 code

There's also a GRE crash that's most likely related: https://jira.fd.io/browse/VPP-1429

The GRE crash happens in l2 code

All tests fail in similar fashion:

==============================================================================
L2BD Test Case
==============================================================================
04:38:43,737 Unexpected or invalid packet:
###[ Ethernet ]###
dst = 00:00:00:ff:03:63
src = 00:00:00:ff:02:2e
type = 0x800
###[ IP ]###
version = 4
ihl = 5
tos = 0x0
len = 42
id = 1
flags =
frag = 0
ttl = 64
proto = udp
chksum = 0x550e
src = 172.17.102.46
dst = 172.17.103.99
\options \
###[ UDP ]###
sport = 1234
dport = 1234
len = 22
chksum = 0x8a54
###[ Raw ]###
load = '260 2 3 -1 -1 '

L2BD MAC learning dual-loop test FAIL [ temp dir used by test case: /tmp/vpp-unittest-TestL2bd-dkqLEe ]
04:38:44,086 Unexpected or invalid packet:
###[ Ethernet ]###
dst = 00:00:00:ff:03:47
src = 00:00:00:ff:02:2c
type = 0x800
###[ IP ]###
version = 4
ihl = 5
tos = 0x0
len = 42
id = 1
flags =
frag = 0
ttl = 64
proto = udp
chksum = 0x552c
src = 172.17.102.44
dst = 172.17.103.71
\options \
###[ UDP ]###
sport = 1234
dport = 1234
len = 22
chksum = 0x9988
###[ Raw ]###
load = '3 2 3 -1 -1 '

L2BD MAC learning single-loop test FAIL [ temp dir used by test case: /tmp/vpp-unittest-TestL2bd-dkqLEe ]

==============================================================================
FAIL: L2BD MAC learning dual-loop test
------------------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jlinkes/vpp/test/test_l2bd.py", line 281, in test_l2bd_dl
self.run_l2bd_test(self.dl_pkts_per_burst)
File "/home/jlinkes/vpp/test/test_l2bd.py", line 247, in run_l2bd_test
self.verify_capture(i, capture)
File "/home/jlinkes/vpp/test/test_l2bd.py", line 203, in verify_capture
self.assertEqual(payload_info.dst, dst_sw_if_index)
AssertionError: 3 != 1

==============================================================================
FAIL: L2BD MAC learning single-loop test
------------------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jlinkes/vpp/test/test_l2bd.py", line 264, in test_l2bd_sl
self.run_l2bd_test(self.sl_pkts_per_burst)
File "/home/jlinkes/vpp/test/test_l2bd.py", line 247, in run_l2bd_test
self.verify_capture(i, capture)
File "/home/jlinkes/vpp/test/test_l2bd.py", line 203, in verify_capture
self.assertEqual(payload_info.dst, dst_sw_if_index)
AssertionError: 3 != 1