Github user zwoop commented on the issue:
https://github.com/apache/trafficserver/issues/1531
I got this again on Docs.
```
(gdb) bt full
#0 0x00002b5b8bd881d7 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
resultvar = 0
pid = 24448
selftid = 24454
#1 0x00002b5b8bd89a08 in __GI_abort () at abort.c:119
act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction =
0x0}, sa_mask = {__val = {18446744073709551615 <repeats 16 times>}}, sa_flags =
0, sa_restorer = 0x0}
sigs = {__val = {32, 0 <repeats 15 times>}}
#2 0x00002b5b89af48fe in ink_abort (message_format=0x2b5b89b0b160 "%s:%d:
failed assertion `%s`") at ink_error.cc:99
ap = {{gp_offset = 32, fp_offset = 48, overflow_arg_area =
0x2aaaab5fe960, reg_save_area = 0x2aaaab5fe8a0}}
#3 0x00002b5b89af1fbf in _ink_assert (expression=0x902748
"server_entry->read_vio == (VIO *)data", file=0x901a0c "HttpSM.cc", line=1811)
at ink_assert.cc:37
No locals.
#4 0x000000000064dcc8 in HttpSM::state_read_server_response_header
(this=0x2aaab14ee380, event=3, data=0x2aaaeea0a910) at HttpSM.cc:1811
__FUNCTION__ = "state_read_server_response_header"
bytes_used = -1419774208
vio = 0x0
state = 10922
#5 0x0000000000650fe6 in HttpSM::main_handler (this=0x2aaab14ee380,
event=3, data=0x2aaaeea0a910) at HttpSM.cc:2663
jump_point = (int (HttpSM::*)(HttpSM * const, int, void *))
0x64db74 <HttpSM::state_read_server_response_header(int, void*)>
__FUNCTION__ = "main_handler"
vc_entry = 0x2aaab14efb88
#6 0x0000000000574752 in Continuation::handleEvent (this=0x2aaab14ee380,
event=3, data=0x2aaaeea0a910) at
/usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:153
No locals.
#7 0x0000000000807027 in write_signal_and_update (event=3,
vc=0x2aaaeea0a770) at UnixNetVConnection.cc:176
__FUNCTION__ = "write_signal_and_update"
#8 0x000000000080725e in write_signal_done (event=3, nh=0x2b5b8e409e50,
vc=0x2aaaeea0a770) at UnixNetVConnection.cc:218
No locals.
#9 0x00000000008072ee in write_signal_error (nh=0x2b5b8e409e50,
vc=0x2aaaeea0a770, lerrno=32) at UnixNetVConnection.cc:237
No locals.
#10 0x00000000008081de in write_to_net_io (nh=0x2b5b8e409e50,
vc=0x2aaaeea0a770, thread=0x2b5b8e406000) at UnixNetVConnection.cc:468
err = 32
errlen = 4
s = 0x2aaaeea0a908
mutex = 0x2b5b8d914c60
lock = {m = {m_ptr = 0x2aaac4e02ed0}, lock_acquired = true}
__FUNCTION__ = "write_to_net_io"
ntodo = 959
buf = <error reading variable>
towrite = 46913636312944
signalled = 0
needs = 32
total_written = 4
r = 47672214753344
#11 0x0000000000808023 in write_to_net (nh=0x2b5b8e409e50,
vc=0x2aaaeea0a770, thread=0x2b5b8e406000) at UnixNetVConnection.cc:443
mutex = 0x2b5b8d914c60
#12 0x00000000007ff412 in NetHandler::mainNetEvent (this=0x2b5b8e409e50,
event=5, e=0x2aaaabc05a60) at UnixNet.cc:526
epd = 0x2aaaeea0ca18
poll_timeout = 0
pd = 0x2b5b8ea99000
vc = 0x2aaaeea0a770
__FUNCTION__ = "mainNetEvent"
#13 0x0000000000574752 in Continuation::handleEvent (this=0x2b5b8e409e50,
event=5, data=0x2aaaabc05a60) at
/usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:153
No locals.
#14 0x000000000082b640 in EThread::process_event (this=0x2b5b8e406000,
e=0x2aaaabc05a60, calling_code=5) at UnixEThread.cc:143
c_temp = 0x2b5b8e409e50
lock = {m = {m_ptr = 0x2b5b8d9141e0}, lock_acquired = true}
__FUNCTION__ = "process_event"
#15 0x000000000082bc1f in EThread::execute (this=0x2b5b8e406000) at
UnixEThread.cc:270
done_one = false
e = 0x2aaaabc05a60
NegativeQueue = {<DLL<Event, Event::Link_link>> = {head =
0x2aaaabc04c80}, tail = 0x2aaaabc04080}
next_time = 1490586447220437269
__FUNCTION__ = "execute"
#16 0x000000000082ac5a in spawn_thread_internal (a=0x2b5b8d6aea90) at
Thread.cc:84
p = 0x2b5b8d6aea90
#17 0x00002b5b8b638dc5 in start_thread (arg=0x2aaaab5ff700) at
pthread_create.c:308
__res = <optimized out>
pd = 0x2aaaab5ff700
now = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {46912508000000,
-4231554947831992312, 0, 140736391318576, 46912508000000, 0,
-8065056817632415736, -7786325772008460280}, mask_was_saved = 0}}, priv = {pad
= {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call = <optimized out>
pagesize_m1 = <optimized out>
sp = <optimized out>
freesize = <optimized out>
#18 0x00002b5b8be4a73d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
```
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