hq crashes immediately if IPv6 is not available

If you try to run the `hq` tool provided by this binary in an environment where IPv6 is not available, it immediately crashes catastrophically.

```
E1016 11:02:04.554917 984903 main.cpp:42] Cannot open /tmp/logs
W1016 11:02:04.603056 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603096 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603099 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603104 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603111 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603116 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603121 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603155 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603161 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603165 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603173 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603180 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603193 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603199 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603201 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603207 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603212 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603216 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603220 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603224 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603227 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603230 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603233 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
W1016 11:02:04.603238 984903 QuicServerWorker.cpp:1231] HostId is already set to 0
E1016 11:02:04.603979 984920 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.604229 984921 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.604498 984923 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.604744 984925 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.605010 984927 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.605201 984928 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.605392 984929 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.605721 984931 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.606081 984932 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.606281 984934 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.606518 984935 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.606736 984937 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.623790 984938 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.624017 984939 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.624197 984941 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.624449 984943 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.604512 984923 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.624572 984923 ExceptionTracer.cpp:221] exception stack complete
terminate called after throwing an instance of 'folly::AsyncSocketException'
what(): AsyncSocketException: failed to bind the async udp socket for:[::1]:6666, type = Socket not open, errno = 99 (Cannot assign requested address)
*** Aborted at 1760637724 (Unix time, try 'date -d @1760637724') ***
*** Signal 6 (SIGABRT) (0x3e8000f0747) received by PID 984903 (pthread TID 0x7fe59cff96c0) (linux TID 984923) (maybe from PID 984903, UID 1000) (code: -6), stack trace: ***
E1016 11:02:04.604759 984925 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.624804 984925 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.604243 984921 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.624902 984921 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.603993 984920 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.605027 984927 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.624962 984920 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.605733 984931 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625042 984931 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.605206 984928 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.605401 984929 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625005 984927 ExceptionTracer.cpp:221] exception stack complete
E1016 11:02:04.625135 984929 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625084 984928 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625046 984944 ExceptionTracer.cpp:217] terminate() called, exception stack follows
terminate called recursively
E1016 11:02:04.625305 984945 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.606741 984937 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625368 984937 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.606534 984935 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.623797 984938 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625437 984938 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.624204 984941 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.606290 984934 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625466 984941 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625420 984935 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625504 984934 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.606097 984932 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.624023 984939 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625591 984939 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625576 984932 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625604 984947 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.625185 984944 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625696 984944 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.624460 984943 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625733 984943 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625313 984945 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.625838 984945 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.625873 984948 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.626063 984949 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.625609 984947 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.626232 984947 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.626247 984950 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.625883 984948 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.626402 984948 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.626070 984949 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.626509 984949 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.626509 984951 ExceptionTracer.cpp:217] terminate() called, exception stack follows
E1016 11:02:04.626251 984950 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.626710 984950 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.626750 984952 ExceptionTracer.cpp:217] terminate() called, exception stack follows
F1016 11:02:04.626754 984903 QuicServer.cpp:329] Check failed: initialized_ Quic server is not initialized. Consider calling waitUntilInitialized() prior to: start
*** Check failure stack trace: ***
E1016 11:02:04.626520 984951 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.626963 984951 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
E1016 11:02:04.626755 984952 ExceptionTracer.cpp:219] Exception type: folly::AsyncSocketException (19 frames)
@ 000000000011646d __cxa_throw
@ 000000000004c09f (unknown)
@ 00000000000420ad quic::QuicServerWorker::bind(folly::SocketAddress const&, folly::AsyncUDPSocket::BindOptions)
@ 00000000000260f3 (unknown)
@ 0000000000219086 (unknown)
@ 000000000021e06b (unknown)
@ 000000000021e6ad (unknown)
@ 0000000000222ff1 (unknown)
@ 0000000000232ec8 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019829 (unknown)
@ 000000000001b48f event_base_loop
@ 000000000021efcf folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54b folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f645 folly::EventBase::loop()
@ 000000000021f6a0 folly::EventBase::loopForever()
@ 000000000025dceb (unknown)
@ 000000000004e3e4 (unknown)
@ 0000000000071f54 start_thread
@ 00000000000f532c __clone3

E1016 11:02:04.627187 984952 ExceptionTracer.cpp:221] exception stack complete
terminate called recursively
@ 0000000000127147 (unknown)
@ 000000000001a06f (unknown)
@ 0000000000073e9c __pthread_kill_implementation
@ 0000000000019f3d gsignal
@ 00000000000016cf abort
@ 00000000000091b3 (unknown)
@ 000000000001eb9b (unknown)
@ 0000000000008c2a __cxa_call_terminate
@ 000000000001e410 __gxx_personality_v0
@ 000000000001e44a (unknown)
@ 000000000001ef49 _Unwind_Resume
@ 000000000004dbb4 (unknown)
@ 000000000021e06a (unknown)
@ 000000000021e6ac (unknown)
@ 0000000000222ff0 (unknown)
@ 0000000000232ec7 folly::EventHandler::libeventCallback(int, short, void*)
@ 0000000000019828 (unknown)
@ 000000000001b48e event_base_loop
@ 000000000021efce folly::EventBase::loopMain(int, folly::EventBase::LoopOptions)
@ 000000000021f54a folly::EventBase::loopBody(int, folly::EventBase::LoopOptions)
@ 000000000021f644 folly::EventBase::loop()
@ 000000000021f69f folly::EventBase::loopForever()
@ 000000000025dcea (unknown)
@ 000000000004e3e3 (unknown)
@ 0000000000071f53 start_thread
@ 00000000000f532b __clone3
zsh: IOT instruction (core dumped) hq
```

This was previously reported at https://github.com/facebook/proxygen/issues/296. However: **why is having IPv6 available a hard requirement for this tool to run at all?** Why can it not bind to the IPv4 socket if it needs a local socket?