So far seen only in small scale cps tests. [0] [1]
Probably not a duplicate of CSIT-1901, although 4c and avf, that issue needs high traffic.
Also improbable to be a duplicate of CSIT-1937, although udp, that issue appears on different nic+driver and only causes small packet drop, not a crash.

RC1 testing is in progress, so I will try to get core dumps later.

[0] https://s3-logs.fd.io/vex-yul-rot-jenkins-1/csit-vpp-perf-ndrpdr-weekly-master-2n-spr/45/log.html.gz#s1-s1-s1-s2-s8-t3-k3-k5-k1-k1
[1] https://s3-logs.fd.io/vex-yul-rot-jenkins-1/csit-vpp-perf-ndrpdr-weekly-master-2n-spr/45/log.html.gz#s1-s1-s1-s2-s22-t3-k3-k5-k1-k1