Backtrace:
#0  Envoy::Upstream::HealthCheckerImplBase::ActiveHealthCheckSession::handleFailure (this=0x7108d10, type=<optimized out>) at external/envoy/source/common/upstream/health_checker_base_impl.cc:313
#0  Envoy::Upstream::HealthCheckerImplBase::ActiveHealthCheckSession::handleFailure (this=0x7108d10, type=<optimized out>) at external/envoy/source/common/upstream/health_checker_base_impl.cc:313
#1  0x000000000073f823 in Envoy::Upstream::HttpHealthCheckerImpl::HttpActiveHealthCheckSession::onResponseComplete (this=0x7108d10) at external/envoy/source/common/upstream/health_checker_impl.cc:263
#2  0x000000000074c77c in Envoy::Http::StreamDecoderWrapper::decodeHeaders(std::unique_ptr<Envoy::Http::HeaderMap, std::default_delete<Envoy::Http::HeaderMap> >&&, bool) (this=0xf65e0a0, headers=<unknown type in /usr/sbin/envoy, CU 0x829dc84, DIE 0x8347c89>, end_stream=<optimized out>) at bazel-out/k8-opt/bin/external/envoy/source/common/http/_virtual_includes/codec_wrappers_lib/common/http/codec_wrappers.h:23
#3  0x00000000007c8b26 in Envoy::Http::Http1::ClientConnectionImpl::onMessageComplete (this=<optimized out>) at external/envoy/source/common/http/http1/codec_impl.cc:759
#4  0x00000000007c6639 in Envoy::Http::Http1::ConnectionImpl::onMessageCompleteBase (this=0x7131088) at external/envoy/source/common/http/http1/codec_impl.cc:475
#5  0x00000000007c9fdd in operator() (this=<optimized out>, parser=<optimized out>) at external/envoy/source/common/http/http1/codec_impl.cc:310
#6  Envoy::Http::Http1::ConnectionImpl::$_7::__invoke (parser=<optimized out>) at external/envoy/source/common/http/http1/codec_impl.cc:309
#7  0x0000000000984ebb in http_parser_execute ()
#8  0x00000000007c5fa4 in Envoy::Http::Http1::ConnectionImpl::dispatchSlice (this=0x7131088, slice=0x7ffdad5ce7e8 "\001", len=1934) at external/envoy/source/common/http/http1/codec_impl.cc:396
#9  0x00000000007c5d9f in Envoy::Http::Http1::ConnectionImpl::dispatch (this=0x7131088, data=...) at external/envoy/source/common/http/http1/codec_impl.cc:381
#10 0x000000000074bbc6 in Envoy::Http::CodecClient::onData (this=0x5910580, data=...) at external/envoy/source/common/http/codec_client.cc:116
#11 0x000000000074c64d in Envoy::Http::CodecClient::CodecReadFilter::onData (this=<optimized out>, data=...) at bazel-out/k8-opt/bin/external/envoy/source/common/http/_virtual_includes/codec_client_lib/common/http/codec_client.h:167
#12 0x000000000068231a in onContinueReading (this=0x6b8fc20, filter=0x0) at external/envoy/source/common/network/filter_manager_impl.cc:56
#13 Envoy::Network::FilterManagerImpl::onRead (this=0x6b8fc20) at external/envoy/source/common/network/filter_manager_impl.cc:66
#14 0x000000000067ef7e in onRead (this=<optimized out>, read_buffer_size=<optimized out>) at external/envoy/source/common/network/connection_impl.cc:272
#15 Envoy::Network::ConnectionImpl::onReadReady (this=0x6b8fc00) at external/envoy/source/common/network/connection_impl.cc:506
#16 0x000000000067ea51 in Envoy::Network::ConnectionImpl::onFileEvent (this=0x6b8fc00, events=<optimized out>) at external/envoy/source/common/network/connection_impl.cc:482
#17 0x0000000000679a35 in operator() (this=0x0, __args=3) at /usr/bin/../lib/gcc/x86_64-linux-gnu/7.4.0/../../../../include/c++/7.4.0/bits/std_function.h:706
#18 operator() (this=<optimized out>, what=<optimized out>, arg=0x7ffdad5ce7e8) at external/envoy/source/common/event/file_event_impl.cc:65
#19 Envoy::Event::FileEventImpl::assignEvents(unsigned int)::$_0::__invoke(int, short, void*) (what=<optimized out>, arg=0x7ffdad5ce7e8) at external/envoy/source/common/event/file_event_impl.cc:49
#20 0x000000000097609d in event_process_active_single_queue ()
#21 0x0000000000974640 in event_base_loop ()
#22 0x00000000006787ed in Envoy::Event::DispatcherImpl::run (this=<optimized out>, type=Envoy::Event::Dispatcher::Block) at external/envoy/source/common/event/dispatcher_impl.cc:178
#23 0x000000000062ba85 in Envoy::Server::InstanceImpl::run (this=0x3968500) at external/envoy/source/server/server.cc:480
#24 0x000000000045b4bc in Envoy::MainCommonBase::run (this=0x39bc6e8) at external/envoy/source/exe/main_common.cc:124
#25 0x000000000045a354 in run (this=0x39bc600) at bazel-out/k8-opt/bin/external/envoy/source/exe/_virtual_includes/envoy_main_common_lib/exe/main_common.h:89
#26 main (argc=17, argv=<optimized out>) at external/envoy/source/exe/main.cc:39