AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /usr/local/src/trafficserver/proxy/http/HttpClientSession.cc:504 HttpClientSession::release(IOBufferReader*)
==27213==ABORTING
traffic_server: using root directory '/opt/ats'
ASAN:SIGSEGV
=================================================================
==27249==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000ee8 (pc 0x000000610711 sp 0x2ab30938a7c0 bp 0x2ab30938a7f0 T4)
    #0 0x610710 in HttpClientSession::release(IOBufferReader*) /usr/local/src/trafficserver/proxy/http/HttpClientSession.cc:504
    #1 0x67cc86 in HttpSM::kill_this() /usr/local/src/trafficserver/proxy/http/HttpSM.cc:6582
    #2 0x67f807 in HttpSM::main_handler(int, void*) /usr/local/src/trafficserver/proxy/http/HttpSM.cc:2558
    #3 0x74714d in Continuation::handleEvent(int, void*) ../../iocore/eventsystem/I_Continuation.h:146
    #4 0x74714d in HttpTunnel::main_handler(int, void*) /usr/local/src/trafficserver/proxy/http/HttpTunnel.cc:1585
    #5 0xbbe7b5 in Continuation::handleEvent(int, void*) ../../iocore/eventsystem/I_Continuation.h:146
    #6 0xbbe7b5 in write_signal_and_update /usr/local/src/trafficserver/iocore/net/UnixNetVConnection.cc:176
    #7 0xbbe7b5 in write_signal_done /usr/local/src/trafficserver/iocore/net/UnixNetVConnection.cc:218
    #8 0xbbe7b5 in write_to_net_io(NetHandler*, UnixNetVConnection*, EThread*) /usr/local/src/trafficserver/iocore/net/UnixNetVConnection.cc:553
    #9 0xb845a3 in NetHandler::mainNetEvent(int, Event*) /usr/local/src/trafficserver/iocore/net/UnixNet.cc:532
    #10 0xc365ae in Continuation::handleEvent(int, void*) /usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:146
    #11 0xc365ae in EThread::process_event(Event*, int) /usr/local/src/trafficserver/iocore/eventsystem/UnixEThread.cc:128
    #12 0xc365ae in EThread::execute() /usr/local/src/trafficserver/iocore/eventsystem/UnixEThread.cc:252
    #13 0xc322d8 in spawn_thread_internal /usr/local/src/trafficserver/iocore/eventsystem/Thread.cc:86
    #14 0x2ab302054df4 in start_thread (/lib64/libpthread.so.0+0x7df4)
    #15 0x2ab3038bd1ac in __clone (/lib64/libc.so.6+0xf61ac)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /usr/local/src/trafficserver/proxy/http/HttpClientSession.cc:504 HttpClientSession::release(IOBufferReader*)
Thread T4 ([ET_NET 3]) created by T0 ([ET_NET 0]) here:
    #0 0x2ab2ffc2286a in __interceptor_pthread_create ../../.././libsanitizer/asan/asan_interceptors.cc:183
    #1 0xc32f65 in ink_thread_create ../../lib/ts/ink_thread.h:150
    #2 0xc32f65 in Thread::start(char const*, unsigned long, void* (*)(void*), void*) /usr/local/src/trafficserver/iocore/eventsystem/Thread.cc:101
    #3 0xc3b5b6 in EventProcessor::start(int, unsigned long) /usr/local/src/trafficserver/iocore/eventsystem/UnixEventProcessor.cc:140
    #4 0x4967bb in main /usr/local/src/trafficserver/proxy/Main.cc:1624
    #5 0x2ab3037e8af4 in __libc_start_main (/lib64/libc.so.6+0x21af4)

==27249==ABORTING
traffic_server: using root directory '/opt/ats'
ASAN:SIGSEGV
=================================================================
==27286==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000ee8 (pc 0x000000610711 sp 0x2b53f9c387c0 bp 0x2b53f9c387f0 T7)
    #0 0x610710 in HttpClientSession::release(IOBufferReader*) /usr/local/src/trafficserver/proxy/http/HttpClientSession.cc:504
    #1 0x67cc86 in HttpSM::kill_this() /usr/local/src/trafficserver/proxy/http/HttpSM.cc:6582
    #2 0x67f807 in HttpSM::main_handler(int, void*) /usr/local/src/trafficserver/proxy/http/HttpSM.cc:2558
    #3 0x74714d in Continuation::handleEvent(int, void*) ../../iocore/eventsystem/I_Continuation.h:146
    #4 0x74714d in HttpTunnel::main_handler(int, void*) /usr/local/src/trafficserver/proxy/http/HttpTunnel.cc:1585
    #5 0x594051 in Continuation::handleEvent(int, void*) ../iocore/eventsystem/I_Continuation.h:146
    #6 0x594051 in PluginVC::process_write_side(bool) /usr/local/src/trafficserver/proxy/PluginVC.cc:545
    #7 0x59e324 in PluginVC::main_handler(int, void*) /usr/local/src/trafficserver/proxy/PluginVC.cc:208
    #8 0xc336ce in Continuation::handleEvent(int, void*) /usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:146
    #9 0xc336ce in EThread::process_event(Event*, int) /usr/local/src/trafficserver/iocore/eventsystem/UnixEThread.cc:128
    #10 0xc353a9 in EThread::execute() /usr/local/src/trafficserver/iocore/eventsystem/UnixEThread.cc:179
    #11 0xc322d8 in spawn_thread_internal /usr/local/src/trafficserver/iocore/eventsystem/Thread.cc:86
    #12 0x2b53f1ceddf4 in start_thread (/lib64/libpthread.so.0+0x7df4)
    #13 0x2b53f35561ac in __clone (/lib64/libc.so.6+0xf61ac)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /usr/local/src/trafficserver/proxy/http/HttpClientSession.cc:504 HttpClientSession::release(IOBufferReader*)
Thread T7 ([ET_NET 6]) created by T0 ([ET_NET 0]) here:
    #0 0x2b53ef8bb86a in __interceptor_pthread_create ../../.././libsanitizer/asan/asan_interceptors.cc:183
    #1 0xc32f65 in ink_thread_create ../../lib/ts/ink_thread.h:150
    #2 0xc32f65 in Thread::start(char const*, unsigned long, void* (*)(void*), void*) /usr/local/src/trafficserver/iocore/eventsystem/Thread.cc:101
    #3 0xc3b5b6 in EventProcessor::start(int, unsigned long) /usr/local/src/trafficserver/iocore/eventsystem/UnixEventProcessor.cc:140
    #4 0x4967bb in main /usr/local/src/trafficserver/proxy/Main.cc:1624
    #5 0x2b53f3481af4 in __libc_start_main (/lib64/libc.so.6+0x21af4)

==27286==ABORTING
traffic_server: using root directory '/opt/ats'