Github user yatsukhnenko commented on the pull request:
https://github.com/apache/trafficserver/pull/674
Yet another trace
```
#0 0x0000000000503cb4 in HttpServerSession::get_netvc (this=0x0) at
./http/HttpServerSession.h:113
#1 0x00000000005653e9 in HttpSM::tunnel_handler_ua (this=0x2b29ed800000,
event=3, c=0x2b29ed801ca8) at HttpSM.cc:3067
#2 0x00000000005a9356 in HttpTunnel::consumer_handler
(this=0x2b29ed801c00, event=3, c=0x2b29ed801ca8) at HttpTunnel.cc:1261
#3 0x00000000005a9a56 in HttpTunnel::main_handler (this=0x2b29ed801c00,
event=3, data=0x2b29d14146f0) at HttpTunnel.cc:1492
#4 0x00000000004e5a9c in Continuation::handleEvent (this=0x2b29ed801c00,
event=3, data=0x2b29d14146f0) at ../iocore/eventsystem/I_Continuation.h:146
#5 0x00000000006b0224 in write_signal_and_update (event=3,
vc=0x2b29d1414580) at UnixNetVConnection.cc:153
#6 0x00000000006b0322 in write_signal_done (event=3, nh=0x2b29c3009c00,
vc=0x2b29d1414580) at UnixNetVConnection.cc:180
#7 0x00000000006b03b2 in write_signal_error (nh=0x2b29c3009c00,
vc=0x2b29d1414580, lerrno=32) at UnixNetVConnection.cc:199
#8 0x00000000006b117b in write_to_net_io (nh=0x2b29c3009c00,
vc=0x2b29d1414580, thread=0x2b29c3006000) at UnixNetVConnection.cc:476
#9 0x00000000006b0afb in write_to_net (nh=0x2b29c3009c00,
vc=0x2b29d1414580, thread=0x2b29c3006000) at UnixNetVConnection.cc:351
#10 0x00000000006aa5a8 in NetHandler::mainNetEvent (this=0x2b29c3009c00,
event=5, e=0x2b29c5216d80) at UnixNet.cc:400
#11 0x00000000004e5a9c in Continuation::handleEvent (this=0x2b29c3009c00,
event=5, data=0x2b29c5216d80) at ../iocore/eventsystem/I_Continuation.h:146
#12 0x00000000006d11ce in EThread::process_event (this=0x2b29c3006000,
e=0x2b29c5216d80, calling_code=5) at UnixEThread.cc:145
#13 0x00000000006d16d8 in EThread::execute (this=0x2b29c3006000) at
UnixEThread.cc:269
#14 0x00000000006d07b8 in spawn_thread_internal (a=0x2b29c22854c0) at
Thread.cc:88
#15 0x00002b29c12109d1 in start_thread () from /lib64/libpthread.so.0
#16 0x000000318a6e88fd in clone () from /lib64/libc.so.6
```
It seems I do something wrong in plugin
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