Hi Klement and vpp-dev,

https://jira.fd.io/browse/VPP-1522 fixed the issue with an assert we've been 
seeing with random reassembly, however, there's still some other failure in 
that test: https://jira.fd.io/browse/VPP-1475

It seems that not all fragments are sent properly. The run documented in Jira 
shows only 3089 fragments out of 5953 being sent and the test only sees 39 out 
of 257 packets received.

Could you or anyone from vpp-dev who's more familiar with the feature/code 
advise on how to debug this further?

I was able to reproduce this on my local x86 Bionic and Xenial VMs as well as 
our Cavium ThunderX machines (the ones we also use in CI). I'd love to see 
whether anyone else can also reproduce it on an x86 machine outside of CI 
(where the failure doesn't happen).

Thanks,
Juraj
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