GitHub user zwoop reopened an issue:
https://github.com/apache/trafficserver/issues/1531
Assertion in state_read_server_response_header (v7.1.0)
Seeing this on docs (infrequently):
```
(gdb) bt full
#0 0x00007ffff57b21d7 in __GI_raise (sig=sig@entry=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:56
resultvar = 0
pid = 5856
selftid = 5862
#1 0x00007ffff57b38c8 in __GI_abort () at abort.c:90
save_stage = 2
act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction =
0x0}, sa_mask = {__val = {0 <repeats 16 times>}}, sa_flags = 0, sa_restorer =
0x300a00440}
sigs = {__val = {32, 0 <repeats 15 times>}}
#2 0x00007ffff7bb28fe in ink_abort (message_format=0x7ffff7bc9160 "%s:%d:
failed assertion `%s`") at ink_error.cc:99
ap = {{gp_offset = 32, fp_offset = 48, overflow_arg_area =
0x2aaaaaffe960, reg_save_area = 0x2aaaaaffe8a0}}
#3 0x00007ffff7baffbf in _ink_assert (expression=0x902628
"server_entry->read_vio == (VIO *)data", file=0x9018ec "HttpSM.cc", line=1811)
at ink_assert.cc:37
No locals.
#4 0x000000000064dbac in HttpSM::state_read_server_response_header
(this=0x2aaab2ecc300, event=3, data=0x2aaadfe10fe0) at HttpSM.cc:1811
__FUNCTION__ = "state_read_server_response_header"
bytes_used = -1426065664
vio = 0x0
state = 10922
#5 0x0000000000650eca in HttpSM::main_handler (this=0x2aaab2ecc300,
event=3, data=0x2aaadfe10fe0) at HttpSM.cc:2663
jump_point = (int (HttpSM::*)(HttpSM * const, int, void *))
0x64da58 <HttpSM::state_read_server_response_header(int, void*)>
__FUNCTION__ = "main_handler"
vc_entry = 0x2aaab2ecdb08
#6 0x000000000057472a in Continuation::handleEvent (this=0x2aaab2ecc300,
event=3, data=0x2aaadfe10fe0) at
/usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:153
No locals.
#7 0x0000000000806eed in write_signal_and_update (event=3,
vc=0x2aaadfe10e40) at UnixNetVConnection.cc:176
__FUNCTION__ = "write_signal_and_update"
#8 0x0000000000807124 in write_signal_done (event=3, nh=0x7ffff3009e50,
vc=0x2aaadfe10e40) at UnixNetVConnection.cc:218
No locals.
#9 0x00000000008071b4 in write_signal_error (nh=0x7ffff3009e50,
vc=0x2aaadfe10e40, lerrno=32) at UnixNetVConnection.cc:237
No locals.
#10 0x00000000008080d0 in write_to_net_io (nh=0x7ffff3009e50,
vc=0x2aaadfe10e40, thread=0x7ffff3006000) at UnixNetVConnection.cc:463
err = 32
errlen = 4
s = 0x2aaadfe10fd8
mutex = 0x7ffff3512db0
lock = {m = {m_ptr = 0x2aaab0402ca0}, lock_acquired = true}
__FUNCTION__ = "write_to_net_io"
ntodo = 910
buf = <error reading variable>
towrite = 46913388875328
signalled = 0
needs = 32
total_written = 4
r = 140737294027776
#11 0x0000000000807ead in write_to_net (nh=0x7ffff3009e50,
vc=0x2aaadfe10e40, thread=0x7ffff3006000) at UnixNetVConnection.cc:435
mutex = 0x7ffff3512db0
#12 0x00000000007ff2d8 in NetHandler::mainNetEvent (this=0x7ffff3009e50,
event=5, e=0x2aaaabc05ca0) at UnixNet.cc:526
epd = 0x2aaadfe10da8
poll_timeout = 0
pd = 0x7ffff2f1d000
vc = 0x2aaadfe10e40
__FUNCTION__ = "mainNetEvent"
#13 0x000000000057472a in Continuation::handleEvent (this=0x7ffff3009e50,
event=5, data=0x2aaaabc05ca0) at
/usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:153
No locals.
#14 0x000000000082b522 in EThread::process_event (this=0x7ffff3006000,
e=0x2aaaabc05ca0, calling_code=5) at UnixEThread.cc:143
c_temp = 0x7ffff3009e50
lock = {m = {m_ptr = 0x7ffff3512480}, lock_acquired = true}
__FUNCTION__ = "process_event"
#15 0x000000000082bb01 in EThread::execute (this=0x7ffff3006000) at
UnixEThread.cc:270
done_one = false
e = 0x2aaaabc05ca0
NegativeQueue = {<DLL<Event, Event::Link_link>> = {head =
0x2aaaabc04f80}, tail = 0x2aaaabc041a0}
next_time = 1488388269045403248
__FUNCTION__ = "execute"
#16 0x000000000082ab3c in spawn_thread_internal (a=0x7ffff4539fa0) at
Thread.cc:84
p = 0x7ffff4539fa0
#17 0x00007ffff604bdc5 in start_thread (arg=0x2aaaaafff700) at
pthread_create.c:308
__res = <optimized out>
pd = 0x2aaaaafff700
now = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {46912501708544,
8358616470746199031, 0, 140737488348672, 46912501708544, 0,
2786198315644908535, -8358635357929704457}, 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 0x00007ffff587473d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:113
No locals.
```
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