Hi Dave&community,
 
I have added a fix as gerrit review id 37379.

gerrit link: https://gerrit.fd.io/r/c/vpp/+/37379 
<https://gerrit.fd.io/r/c/vpp/+/37379>

short description: "set policer classify interface loop1 ip4-table 0 del" may 
raise crash when worker threads handoff process ip4-policer-classify node. 
Especially under continuous flow test,if the delete of interface policer 
classify just occurs after node nat44-in2out-worker-handoff and before node 
ip4-policer-classify with handoff worker thread, the handoff worker thread will 
raise crash because of the 
pcm->classify_table_index_by_sw_if_index[ti][sw_if_index] has been invalid.

Please have a look at my patch and review it.

Thanks and Regards,
Huawei LI


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