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HPACK crash in 9.0.1 #7838

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@shinrich

We have been getting some background crashes with variations of the following stack since we moved from a 9.0.0 based build to a 9.0.1 based build.

[ 00 ] traffic_server               get_header_field                                                      ( HPACK.cc:357 )
[ 01 ] traffic_server               HpackIndexingTable::lookup(char const*, int, char const*, int) const  ( HPACK.cc:251 )
[ 02 ] traffic_server               hpack_encode_header_block                                             ( HPACK.cc:908 )
[ 03 ] traffic_server               http2_encode_header_blocks                                            ( HTTP2.cc:669 )
[ 04 ] traffic_server               Http2ConnectionState::send_headers_frame(Http2Stream*)                ( Http2ConnectionState.cc:1651 )
[ 05 ] traffic_server               Http2Stream::update_write_request(IOBufferReader*, long, bool)        ( Http2Stream.cc:626 )
[ 06 ] traffic_server               Http2Stream::do_io_write(Continuation*, long, IOBufferReader*, bool)  ( Http2Stream.cc:348 )
[ 07 ] traffic_server               HttpTunnel::producer_run(HttpTunnelProducer*)                         ( HttpTunnel.cc:958 )
[ 08 ] traffic_server               HttpTunnel::tunnel_run(HttpTunnelProducer*)                           ( HttpTunnel.cc:700 )
[ 09 ] traffic_server               HttpSM::state_api_callout(int, void*)                                 ( HttpSM.cc:1543 )
[ 10 ] traffic_server               HttpSM::state_api_callback(int, void*)                                ( HttpSM.cc:1350 )
[ 11 ] traffic_server               TSHttpTxnReenable                                                     ( InkAPI.cc:6230 )
[ 12 ] header_rewrite.so (deleted)                                                                                                                   

I will try to dig into an actual core file to get some more details. From what I can see in backtracio, the HPACK table looks ok and the index seems reasonable given the size of the map.

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