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Short lived connections causing segmentation fault #4310

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#4323
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Short lived connections causing segmentation fault#4310
#4323
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ggreenway
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@dsabeti

Description

@dsabeti
dsabeti
opened on Aug 30, 2018

Description:
When a client attempts to make a very short connection -- for example, checking that a port is open -- Envoy crashes with a seg fault. For context, we have health check logic that tries to establish these short connections periodically.

Repro steps:

  1. Start with envoyproxoy/envoy:3b47cbabb517db69a40f38843a405d1d6f742f5d docker image.
  2. Run Envoy (see config below):
envoy -c /config/config.yaml --service-cluster c --service-node n &
  1. Run a listener "app":
nc -l -p 8080 &
  1. Attempt a short connection to the listener via Envoy:
nc -z localhost 61001
  1. Observe the Segfault:
[2018-08-30 21:15:19.120][138][debug][filter] source/common/tcp_proxy/tcp_proxy.cc:157] [C0] new tcp proxy session
[2018-08-30 21:15:19.120][138][debug][filter] source/common/tcp_proxy/tcp_proxy.cc:293] [C0] Creating connection to cluster 0-service-cluster
[2018-08-30 21:15:19.120][138][debug][pool] source/common/tcp/conn_pool.cc:67] creating a new connection
[2018-08-30 21:15:19.120][138][debug][pool] source/common/tcp/conn_pool.cc:325] [C1] connecting
[2018-08-30 21:15:19.120][138][debug][connection] source/common/network/connection_impl.cc:576] [C1] connecting to 10.255.139.5:8080
[2018-08-30 21:15:19.121][138][debug][connection] source/common/network/connection_impl.cc:585] [C1] connection in progress
[2018-08-30 21:15:19.121][138][debug][pool] source/common/tcp/conn_pool.cc:92] queueing request due to no available connections
[2018-08-30 21:15:19.121][138][debug][main] source/server/connection_handler_impl.cc:218] [C0] new connection
[2018-08-30 21:15:19.121][138][debug][connection] source/common/ssl/ssl_socket.cc:131] [C0] handshake error: 5
[2018-08-30 21:15:19.121][138][debug][connection] source/common/network/connection_impl.cc:133] [C0] closing socket: 0
[2018-08-30 21:15:19.122][138][debug][main] source/server/connection_handler_impl.cc:51] [C0] adding to cleanup list
[2018-08-30 21:15:19.122][138][debug][connection] source/common/network/connection_impl.cc:466] [C1] connected
[2018-08-30 21:15:19.122][138][debug][pool] source/common/tcp/conn_pool.cc:249] [C1] assigning connection
[2018-08-30 21:15:19.122][138][debug][filter] source/common/tcp_proxy/tcp_proxy.cc:467] TCP:onUpstreamEvent(), requestedServerName:
[2018-08-30 21:15:19.122][138][debug][connection] source/common/network/connection_impl.cc:98] [C1] closing data_to_write=0 type=1
[2018-08-30 21:15:19.123][138][debug][connection] source/common/network/connection_impl.cc:133] [C1] closing socket: 1
[2018-08-30 21:15:19.123][138][debug][pool] source/common/tcp/conn_pool.cc:107] [C1] client disconnected
[2018-08-30 21:15:19.123][138][critical][backtrace] bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:125] Caught Segmentation fault, suspect faulting address 0x80

Config:
config.yml:

admin:
  access_log_path: /dev/null
  address:
    socket_address:
      address: 127.0.0.1
      port_value: 61003
static_resources:
  clusters:
  - name: 0-service-cluster
    connect_timeout: 0.25s
    type: STATIC
    lb_policy: ROUND_ROBIN
    hosts:
    - socket_address:
        address: 127.0.0.1
        port_value: 8080
    circuit_breakers:
      thresholds:
      - max_connections: 4294967295
dynamic_resources:
  lds_config:
    path: /config/listeners.yaml

listeners.yml:

version_info: "0"
resources:
- '@type': type.googleapis.com/envoy.api.v2.Listener
  name: listener-8080
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 61001
  filter_chains:
  - filters:
    - name: envoy.tcp_proxy
      config:
        stat_prefix: 0-stats
        cluster: 0-service-cluster
    tls_context:
      common_tls_context:
        tls_certificates:
        - certificate_chain:
            inline_string: |
              -----BEGIN CERTIFICATE-----
              MIID9jCCAt6gAwIBAgIQBz3mQy9iS35PA89k8+AnDzANBgkqhkiG9w0BAQsFADBD
              MQwwCgYDVQQGEwNVU0ExFjAUBgNVBAoTDUNsb3VkIEZvdW5kcnkxGzAZBgNVBAMT
              Emluc3RhbmNlSWRlbnRpdHlDQTAeFw0xODA4MzAyMTA1NDRaFw0xODA4MzEyMTA1
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              LTRmMDYtOWMzYS01MTE2MjNkZWJmYzMxJTAjBgNVBAMTHDBiNGQxZDhkLTZkN2It
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              ZIdT9YI21DqFYg==
              -----END CERTIFICATE-----
              -----BEGIN CERTIFICATE-----
              MIIDKzCCAhOgAwIBAgIRAJnmAqJ7LL0zLTWpRzA6d/swDQYJKoZIhvcNAQELBQAw
              OjEMMAoGA1UEBhMDVVNBMRYwFAYDVQQKEw1DbG91ZCBGb3VuZHJ5MRIwEAYDVQQD
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              6Ogzx4fxN/WMoMmwUF9DFq4goAoI0uUdRqN7PLvowucbqMAlTW1M3agbfVRGUmo2
              Qk4C5en4J9XkupQaROP2ZG7ktbsMj215C+f/w+pcwrm5uqkYkIkTZGSm4nol7xuB
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              XmqmT2Mkb3IRUdTsoMP6JG0CAwEAAaMjMCEwDgYDVR0PAQH/BAQDAgEGMA8GA1Ud
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              uX7ewXOHplteJsZxyV1U44Y1RThmu7NLRdDFT32cQPo45HdjAnKdxV/UEDGuidc=
              -----END CERTIFICATE-----
          private_key:
            inline_string: |
              -----BEGIN RSA PRIVATE KEY-----
              MIIEpAIBAAKCAQEArqHFqLpE683kohGnAIjvY+3sYym/ln+S1uoQqYu6WP1PTXUL
              2Bu9EdXlWM78btUYYNinq4BQ5hCvKa6iH7huFg9SXtJwZOX+4114/uBqZpHtWUUa
              6uCHt08VQxb+cUXPVlAdksoELwx+g8SMt4qbG8jS37RsgARJriwgyz+LbbISsOgK
              uQTv5pk4JRmwDRbtOepItbNNNG3rxmgva/qv9vEaOoDYlutLZ0r/1o64mk/Ef1GI
              8rqmqAbyTGGTZTwefJ0Q2hjo+u/l07bbURYc4MAPGwLHUp/aOzdYJfa7P5Qw41dl
              9GW8nJ1nsrOu01pfkwNJA3H1p02v9wSKqmx9aQIDAQABAoIBAAkL4lRqSdW5VcW7
              il4xuc0Ab0V3zS/7rdyqRXCzB1VC0g/eJ13rmfDJltbx6gvHyDqEHrN4szgn1xse
              q9Fe2X0VEBxPZHklnP2kQvdZIsnrd1MvjERsmzs4wo42K7osdqAvCEkpY+wYBpnG
              3c9IQ969mYbzLse28SYvrQc6ZHurLvCyKFQooETXJsPRyJLkK3fPcaca/m+dc8jV
              qIJBSJIMTVwDI7zPKehn1tlXsUQLxjfoPKHFV+6xJyhU4rGRWAxJ+Ud53tfbBqpv
              tLSFCRFh1nmmdhkBOVdKPtskUW+0WGm9/sSi1sLWQu8imJtWd0EVYSdUvzARvXAi
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              Rwzo9kb5J7Oa/gIWIRikFDsNWeSt2Mqt0O180e1mo5kzzWlolJWz/ZtBQFKB3guf
              +dC6ALF0/bqfxbXrfHBg9PDKfu0/36rCY2QDZ1cCgYATAgEO7tTmVq3itaSR6r+b
              GQSifiDiISS9TrIRlN076b2+yEqJqm6+5IJQlm+W/uEqCzyo7J1h/YgPa9kXLoCR
              8guNIkoW99DiM0puhcbZHkvDJzj37i0YspYbjJ86a6Nshicpow14qoyRD+3vmWTj
              7gHjOZCdWP7nyxVrX3lnYwKBgQCTNYilyisMyOs83Pj8andR7UCXDd7Bki70rvrN
              wBSfvAaNttd5TXjssvecgWuxAn382G342gxouUey0+Er5QTPTjMpk/2ouPjSo+tP
              4b8ELidTq4mBOGyEqB+Kv6i3TIEVQYflBh39FyV5vegFJQqwOSccubcZll5F/RyK
              b8SoHwKBgQDb2LGEiNecwQ+iTSRGNn8FbvNzP/PFb98p0Dzy6+7iVuqGuBSFhLgT
              w+LtNeN5zhioSqCTxEQLQ4HxYXm4U+HJ0SubnWSWFAFoHqU9IA3KirzEudycq6CW
              XXc4s05QAXI1e9JJ222q8PShhkyT5ruYt9aeOSslSvMaqB3W2Fuybg==
              -----END RSA PRIVATE KEY-----
        tls_params:
          cipher_suites: '[ECDHE-RSA-AES256-GCM-SHA384|ECDHE-RSA-AES128-GCM-SHA256]'
        validation_context:
          trusted_ca:
            inline_string: |
              -----BEGIN CERTIFICATE-----
              MIIDJDCCAgygAwIBAgIRALXtOp85ebqiIifjBw5nScswDQYJKoZIhvcNAQELBQAw
              OzEMMAoGA1UEBhMDVVNBMRYwFAYDVQQKEw1DbG91ZCBGb3VuZHJ5MRMwEQYDVQQD
              EwppbnRlcm5hbENBMB4XDTE4MDgzMDE3MDkyN1oXDTE5MDgzMDE3MDkyN1owOzEM
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              iyviaRwkv9vvARrotb/rivRQcNt35ujIWUZMhg/jGtfWIzcQfgOElgg0Lzaqm+Zv
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              81j5Nbzk/KM2r2NqIPeHT2Qi3J9H93ayf9obN+GcpcZV8BzHM6bs7Q==
              -----END CERTIFICATE-----
          verify_subject_alt_name:
          - gorouter.service.cf.internal
      require_client_certificate: true

Call Stack:

#0  0x0000000000ce6c99 in uw_frame_state_for ()
#1  0x0000000000ce88d8 in _Unwind_Backtrace ()
#2  0x0000000000c57cac in backward::details::Unwinder<backward::StackTraceImpl<backward::system_tag::linux_tag>::callback>::operator() (depth=72, f=..., this=0x7fa11c8647c0) at external/com_github_bombela_backward/backward.hpp:647
#3  backward::details::unwind<backward::StackTraceImpl<backward::system_tag::linux_tag>::callback> (depth=72, f=...) at external/com_github_bombela_backward/backward.hpp:688
#4  backward::StackTraceImpl<backward::system_tag::linux_tag>::load_here (this=this@entry=0x7fa11c864820, depth=depth@entry=72) at external/com_github_bombela_backward/backward.hpp:704
#5  0x0000000000c59265 in backward::StackTraceImpl<backward::system_tag::linux_tag>::load_from (depth=64, addr=0x80, this=0x7fa11c864820) at external/com_github_bombela_backward/backward.hpp:710
#6  Envoy::BackwardsTrace::captureFrom (address=0x80, this=0x7fa11c864820) at bazel-out/k8-opt/bin/source/server/_virtual_includes/backtrace_lib/server/backtrace.h:66
#7  Envoy::SignalAction::sigHandler (sig=11, info=<optimized out>, context=<optimized out>) at source/exe/signal_action.cc:33 
#8  <signal handler called>
#9  0x0000000000000080 in ?? ()
#10 0x00000000006f054a in Envoy::Network::ConnectionImpl::state (this=0x31e3a40) at source/common/network/connection_impl.cc:119
#11 0x00000000008c1efe in Envoy::TcpProxy::Filter::onUpstreamEvent (this=0x319ea10, event=Envoy::Network::ConnectionEvent::LocalClose) at source/common/tcp_proxy/tcp_proxy.cc:452
#12 0x00000000006f3f85 in Envoy::Network::ConnectionImpl::raiseEvent (this=0x31e3b80, event=Envoy::Network::ConnectionEvent::LocalClose) at source/common/network/connection_impl.cc:279
#13 0x00000000006f1acd in Envoy::Network::ConnectionImpl::closeSocket (this=0x31e3b80, close_type=Envoy::Network::ConnectionEvent::LocalClose) at source/common/network/connection_impl.cc:144
#14 0x00000000006f1c06 in Envoy::Network::ConnectionImpl::close (this=0x31e3b80, type=Envoy::Network::ConnectionCloseType::NoFlush) at source/common/network/connection_impl.cc:107
#15 0x00000000008c3250 in Envoy::TcpProxy::Filter::~Filter (this=0x319ea10, __in_chrg=<optimized out>) at source/common/tcp_proxy/tcp_proxy.cc:143
#16 0x00000000006f50e1 in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release (this=0x319ea00) at /usr/include/c++/5/bits/shared_ptr_base.h:150
#17 std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count (this=0x31f1268, __in_chrg=<optimized out>) at /usr/include/c++/5/bits/shared_ptr_base.h:659
#18 std::__shared_ptr<Envoy::Network::ReadFilter, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr (this=0x31f1260, __in_chrg=<optimized out>) at /usr/include/c++/5/bits/shared_ptr_base.h:925
#19 std::shared_ptr<Envoy::Network::ReadFilter>::~shared_ptr (this=0x31f1260, __in_chrg=<optimized out>) at /usr/include/c++/5/bits/shared_ptr.h:93
#20 Envoy::Network::FilterManagerImpl::ActiveReadFilter::~ActiveReadFilter (this=0x31f1240, __in_chrg=<optimized out>)
    at bazel-out/k8-opt/bin/source/common/network/_virtual_includes/filter_manager_lib/common/network/filter_manager_impl.h:52
#21 Envoy::Network::FilterManagerImpl::ActiveReadFilter::~ActiveReadFilter (this=0x31f1240, __in_chrg=<optimized out>)
    at bazel-out/k8-opt/bin/source/common/network/_virtual_includes/filter_manager_lib/common/network/filter_manager_impl.h:52
#22 0x00000000006f21d2 in std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter>::operator() (this=<optimized out>, __ptr=<optimized out>) at /usr/include/c++/5/bits/unique_ptr.h:76
#23 std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> >::~unique_ptr (this=0x31eaa10, __in_chrg=<optimized out>)
    at /usr/include/c++/5/bits/unique_ptr.h:236
#24 std::_List_node<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> > >::~_List_node (this=0x31eaa00, __in_chrg=<optimized out>)
    at /usr/include/c++/5/bits/stl_list.h:106
#25 __gnu_cxx::new_allocator<std::_List_node<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> > > >::destroy<std::_List_node<std::unique_ptr<Envoy::Network::FilterManagerImpl::Act
iveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> > > > (this=<optimized out>, __p=0x31eaa00) at /usr/include/c++/5/ext/new_allocator.h:124
#26 std::__cxx11::_List_base<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> >, std::allocator<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_d
elete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> > > >::_M_clear (this=0x31e3a78) at /usr/include/c++/5/bits/list.tcc:75
#27 std::__cxx11::_List_base<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> >, std::allocator<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_d
elete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> > > >::~_List_base (this=0x31e3a78, __in_chrg=<optimized out>) at /usr/include/c++/5/bits/stl_list.h:446
#28 std::__cxx11::list<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<Envoy::Network::FilterManagerImpl::ActiveReadFilter> >, std::allocator<std::unique_ptr<Envoy::Network::FilterManagerImpl::ActiveReadFilter, std::default_delete<
Envoy::Network::FilterManagerImpl::ActiveReadFilter> > > >::~list (this=0x31e3a78, __in_chrg=<optimized out>) at /usr/include/c++/5/bits/stl_list.h:507
#29 Envoy::Network::FilterManagerImpl::~FilterManagerImpl (this=0x31e3a58, __in_chrg=<optimized out>) at bazel-out/k8-opt/bin/source/common/network/_virtual_includes/filter_manager_lib/common/network/filter_manager_impl.h:39
#30 Envoy::Network::ConnectionImpl::~ConnectionImpl (this=this@entry=0x31e3a40, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at source/common/network/connection_impl.cc:70
#31 0x00000000006f22a1 in Envoy::Network::ConnectionImpl::~ConnectionImpl (this=0x31e3a40, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at source/common/network/connection_impl.cc:78
#32 0x00000000006e8e71 in Envoy::Server::ConnectionHandlerImpl::ActiveConnection::~ActiveConnection (this=0x31f1500, __in_chrg=<optimized out>) at source/server/connection_handler_impl.cc:244
#33 0x00000000006ece0d in std::default_delete<Envoy::Event::DeferredDeletable>::operator() (this=<optimized out>, __ptr=<optimized out>) at /usr/include/c++/5/bits/unique_ptr.h:76
#34 std::unique_ptr<Envoy::Event::DeferredDeletable, std::default_delete<Envoy::Event::DeferredDeletable> >::reset (__p=<optimized out>, this=<optimized out>) at /usr/include/c++/5/bits/unique_ptr.h:344
#35 Envoy::Event::DispatcherImpl::clearDeferredDeleteList (this=0x3134b00) at source/common/event/dispatcher_impl.cc:68
#36 0x0000000000a01418 in event_process_active_single_queue (base=base@entry=0x3136840, max_to_process=max_to_process@entry=2147483647, endtime=endtime@entry=0x0, activeq=<optimized out>) at ../event.c:1646
#37 0x0000000000a01b0f in event_process_active (base=base@entry=0x3136840) at ../event.c:1738
#38 0x0000000000a04898 in event_base_loop (base=0x3136840, flags=<optimized out>) at ../event.c:1961
#39 0x00000000006e8986 in Envoy::Server::WorkerImpl::threadRoutine (this=0x312cf30, guard_dog=...) at source/server/worker_impl.cc:94
#40 0x0000000000a52c6e in Envoy::Thread::Thread::Thread(std::function<void ()>)::{lambda(void*)#1}::_FUN(void*) () at /usr/include/c++/5/functional:2267
#41 0x00007fa134a0a6ba in start_thread (arg=0x7fa11c877700) at pthread_create.c:333
#42 0x00007fa13443741d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

cc @jvshahid

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