Assert in HTTP tunnel

(gdb) bt
#0  0x0000003f2de327f5 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x0000003f2de33fd5 in abort () at abort.c:92
#2  0x00007ffff7ddc3ac in ink_die_die_die (retval=1) at ink_error.cc:43
#3  0x00007ffff7ddc47e in ink_fatal_va(int, const char *, typedef __va_list_tag __va_list_tag *) (return_code=1, 
    message_format=0x7ffff6c03450 "HttpTunnel.cc:1088: failed assert `p->alive == true || event == HTTP_TUNNEL_EVENT_PRECOMPLETE || sm->enable_redirection || (p->self_consumer && p->self_consumer->alive == true)`", ap=0x7ffff6c03350) at ink_error.cc:65
#4  0x00007ffff7ddc549 in ink_fatal (return_code=1, 
    message_format=0x7ffff6c03450 "HttpTunnel.cc:1088: failed assert `p->alive == true || event == HTTP_TUNNEL_EVENT_PRECOMPLETE || sm->enable_redirection || (p->self_consumer && p->self_consumer->alive == true)`") at ink_error.cc:73
#5  0x00007ffff7ddb366 in _ink_assert (
    a=0x691120 "p->alive == true || event == HTTP_TUNNEL_EVENT_PRECOMPLETE || sm->enable_redirection || (p->self_consumer && p->self_consumer->alive == true)", f=0x690ed2 "HttpTunnel.cc", l=1088) at ink_assert.cc:44
#6  0x0000000000564d4d in HttpTunnel::producer_handler (this=0x7fffede95a18, event=104, p=0x7fffede95c18) at HttpTunnel.cc:1088
#7  0x0000000000564966 in HttpTunnel::producer_run (this=0x7fffede95a18, p=0x7fffede95c18) at HttpTunnel.cc:926
#8  0x0000000000564185 in HttpTunnel::tunnel_run (this=0x7fffede95a18, p_arg=0x0) at HttpTunnel.cc:694
#9  0x000000000053548f in HttpSM::handle_api_return (this=0x7fffede93d50) at HttpSM.cc:1556
#10 0x000000000054194c in HttpSM::set_next_state (this=0x7fffede93d50) at HttpSM.cc:6510
#11 0x000000000054135a in HttpSM::call_transact_and_set_next_state (this=0x7fffede93d50, f=0) at HttpSM.cc:6332
#12 0x0000000000535384 in HttpSM::handle_api_return (this=0x7fffede93d50) at HttpSM.cc:1523
#13 0x0000000000545711 in HttpSM::do_api_callout (this=0x7fffede93d50) at HttpSM.cc:506
#14 0x0000000000535d71 in HttpSM::state_read_server_response_header (this=0x7fffede93d50, event=104, data=0x7fffdc00eb78)
    at HttpSM.cc:1833
#15 0x0000000000536fd1 in HttpSM::main_handler (this=0x7fffede93d50, event=104, data=0x7fffdc00eb78) at HttpSM.cc:2443
#16 0x00000000004d4ae0 in Continuation::handleEvent (this=0x7fffede93d50, event=104, data=0x7fffdc00eb78)
    at ../iocore/eventsystem/I_Continuation.h:146
#17 0x0000000000650571 in read_signal_and_update (event=104, vc=0x7fffdc00e9b0) at UnixNetVConnection.cc:136
#18 0x0000000000650723 in read_signal_done (event=104, nh=0x7ffff6d0b628, vc=0x7fffdc00e9b0) at UnixNetVConnection.cc:166
#19 0x0000000000650cc4 in read_from_net (nh=0x7ffff6d0b628, vc=0x7fffdc00e9b0, thread=0x7ffff6d0a010) at UnixNetVConnection.cc:289
#20 0x0000000000652aa9 in UnixNetVConnection::net_read_io (this=0x7fffdc00e9b0, nh=0x7ffff6d0b628, lthread=0x7ffff6d0a010)
    at UnixNetVConnection.cc:790
#21 0x000000000064d7ed in NetHandler::mainNetEvent (this=0x7ffff6d0b628, event=5, e=0xefa6a0) at UnixNet.cc:399
#22 0x00000000004d4ae0 in Continuation::handleEvent (this=0x7ffff6d0b628, event=5, data=0xefa6a0)
    at ../iocore/eventsystem/I_Continuation.h:146
#23 0x000000000066e8f8 in EThread::process_event (this=0x7ffff6d0a010, e=0xefa6a0, calling_code=5) at UnixEThread.cc:140
#24 0x000000000066eeb5 in EThread::execute (this=0x7ffff6d0a010) at UnixEThread.cc:262
#25 0x000000000066da68 in spawn_thread_internal (a=0xeed0f0) at Thread.cc:85
#26 0x0000003f2e6068e0 in start_thread (arg=0x7ffff6c08710) at pthread_create.c:297
#27 0x0000003f2dee0c9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#28 0x0000000000000000 in ?? ()