Hi, When you abort the connection, is it fully established or half-open? Half-opens are cleaned up by the owner thread after a timeout, but the 5-tuple should be assigned to the fully established session by that point. tcp_half_open_connection_cleanup does not cleanup the bihash instead session_stream_connect_notify does once tcp connect returns either success or failure.
So a few questions: - is it accurate to assume you have a builtin vpp app and rely only on C apis to interact with host stack? - on what thread (main or first worker) do you call vnet_connect? - what api do you use to close the session? - what version of vpp is this because lines don’t match vpp latest? Regards, Florin > On Mar 19, 2023, at 2:08 AM, Zhang Dongya <fortitude.zh...@gmail.com> wrote: > > Hi list, > > recently in our application, we constantly triggered such abrt issue which > make our connectivity interrupt for a while: > > Mar 19 16:11:26 ubuntu vnet[2565933]: received signal SIGABRT, PC > 0x7fefd3b2000b > Mar 19 16:11:26 ubuntu vnet[2565933]: > /home/fortitude/glx/vpp/src/vnet/tcp/tcp_input.c:3004 (tcp46_input_inline) > assertion `tcp_lookup_is_valid (tc0, b[0], tcp_buffer_hdr (b[0]))' fails > > Our scenario is quite simple, we will make 4 parallel tcp connection (use 4 > fixed source ports) to a remote vpp stack (fixed ip and port), and will do > some keepalive in our application layer, since we only use the vpp tcp stack > to make the middle box happy with the connection, we do not use the data > transport of tcp statck actually. > > However, since the network condition is complex, we have to always need to > abrt the connection and reconnect. > > I keep to merge upstream session and tcp fix however the issue still not > fixed, what I found now it may be in some case > tcp_half_open_connection_cleanup may not deleted the half open session from > the lookup table (bihash) and the session index is realloced by other > connection. > > Hope the list can provide some hint about how to overcome this issue, thanks > a lot. > > >
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