ywkaras commented on issue #7739:
URL: https://github.com/apache/trafficserver/issues/7739#issuecomment-825914141
Here is a backtrace from the core file:
```
(gdb) bt full
#0 NextHopConsistentHash::findNextHop(tsapi_httptxn*, void*, long) () at
NextHopConsistentHash.cc:324
r = <optimized out>
sm = 0x7fad20e883f0
result = 0x7fad20e88e10
request_info = {<RequestData> = {_vptr.RequestData = 0x87b150
<vtable for HttpRequestData+16>}, hdr = 0x7fad20e88b98, hostname_str =
0x7fad20d67c24 "wrong.com", api_info = 0x7fad20e88d58, xact_start = 1619198439,
src_ip = {sa = {sa_family = 2, sa_data =
"\234&\177\000\000\001\000\000\000\000\000\000\000"}, sin = {sin_family = 2,
sin_port = 9884, sin_addr = {s_addr = 16777343}, sin_zero =
"\000\000\000\000\000\000\000"}, sin6 = {sin6_family = 2, sin6_port = 9884,
sin6_flowinfo = 16777343, sin6_addr = {__in6_u = {__u6_addr8 = '\000' <repeats
15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0}, __u6_addr32 = {0, 0, 0,
0}}}, sin6_scope_id = 0}}, dest_ip = {sa = {sa_family = 0, sa_data = '\000'
<repeats 13 times>}, sin = {sin_family = 0, sin_port = 0, sin_addr = {s_addr =
0}, sin_zero = "\000\000\000\000\000\000\000"}, sin6 = {sin6_family = 0,
sin6_port = 0, sin6_flowinfo = 0, sin6_addr = {__in6_u = {__u6_addr8 = '\000'
<repeats 15 times>, __u6_addr16 = {0, 0, 0, 0, 0, 0, 0, 0},
__u6_addr32 = {0, 0, 0, 0}}}, sin6_scope_id = 0}}, incoming_port = 61033, tag
= 0x0, internal_txn = false, cache_info_lookup_url = 0x7fad20e88520,
cache_info_parent_selection_url = 0x7fad20e88580}
sm_id = <optimized out>
retry_time = <optimized out>
_now = 0
firstcall = <optimized out>
nextHopRetry = false
wrapped = true
wrap_around = std::vector<bool> of length 1, capacity 64 = {1}
cur_ring = <optimized out>
hash_key = 0
lookups = <optimized out>
hash = {<ATSHash64> = {<ATSHashBase> = {_vptr.ATSHashBase =
0x7fad34b4a8e8 <vtable for ATSHash64Sip24+16>}, <No data fields>}, block_buffer
= "/obj\000\000\000", block_buffer_len = 4 '\004', k0 = 0, k1 = 0, v0 =
6273115432221753012, v1 = 1893682315080405021, v2 = 17072421927894701096, v3 =
17951659473895730748, hfinal = 6378598250446050493, total_len = 4, finalized =
true}
hostRec = <optimized out>
pRec = <optimized out>
Python Exception <class 'gdb.error'> There is no member or method named
_M_bbegin.:
pStatus = @0xb1ff20: {hosts_statuses = std::unordered_map with 1
elements, host_status_rwlock = {__data = {__lock = 0, __nr_readers = 0,
__readers_wakeup = 0, __writer_wakeup = 0, __nr_readers_queued = 0,
__nr_writers_queued = 0, __writer = 0, __shared = 0, __pad1 = 0, __pad2 = 0,
__flags = 0}, __size = '\000' <repeats 55 times>, __align = 0}}
host_stat = <optimized out>
hst = <optimized out>
__FUNCTION__ = "findNextHop"
#1 0x00000000005d2c38 in
find_server_and_update_current_info(HttpTransact::State*) () at
HttpTransact.cc:614
host_len = <optimized out>
host = <optimized out>
__FUNCTION__ = "find_server_and_update_current_info"
#2 0x00000000005dec83 in
HttpTransact::handle_response_from_parent(HttpTransact::State*) () at
HttpTransact.cc:3693
addrbuf =
"172.17.0.2\000\064\255\177\000\000\t\000\000\000\000\000\000\000P\336O\000\000\000\000\000\210͂\000\000\000\000\000ɝ?2\255\177"
next_lookup = HttpTransact::UNDEFINED_LOOKUP
__FUNCTION__ = "handle_response_from_parent"
#3 0x00000000005e00a5 in HttpTransact::HandleResponse(HttpTransact::State*)
() at HttpTransact.cc:3490
__FUNCTION__ = "HandleResponse"
#4 0x0000000000580e67 in HttpSM::call_transact_and_set_next_state(void
(*)(HttpTransact::State*)) () at HttpSM.cc:7359
__FUNCTION__ = "call_transact_and_set_next_state"
#5 0x0000000000594bdf in HttpSM::state_send_server_request_header(int,
void*) () at HttpSM.cc:2184
__FUNCTION__ = "state_send_server_request_header"
method = <optimized out>
#6 0x0000000000596f78 in HttpSM::main_handler(int, void*) () at
HttpSM.cc:2699
jump_point = <optimized out>
__FUNCTION__ = "main_handler"
vc_entry = <optimized out>
#7 0x00000000007dfa7e in write_signal_and_update(int, UnixNetVConnection*)
() at UnixNetVConnection.cc:117
__FUNCTION__ = "write_signal_and_update"
loc = {file = 0x0, func = 0x0, line = 0}
log_message = {<Throttler> = {_vptr.Throttler = 0x0,
_last_allowed_time = {static _S_min_alignment = 8, static _S_alignment = 8,
_M_i = {<std::chrono::time_point<std::chrono::_V2::system_clock,
std::chrono::duration<long, std::ratio<1, 1000000000> > >> = {__d = {__r = 0}},
<No data fields>}, static is_always_lock_free = <error reading variable: No
global symbol "std::atomic<Throttler::TimePoint>::is_always_lock_free".>},
_interval = {static _S_min_alignment = 8, static _S_alignment = 8, _M_i = {__r
= 0}, static is_always_lock_free = <optimized out>}, _suppressed_count = 0},
_throttling_value_is_explicitly_set = false, _is_throttled = false, static
_default_log_throttling_interval = {static _S_min_alignment = 8, static
_S_alignment = 8, _M_i = {__r = 60000}, static is_always_lock_free = <optimized
out>}, static _default_debug_throttling_interval = {static _S_min_alignment =
8, static _S_alignment = 8, _M_i = {__r = 0}, static is_always_lock_free =
<optimized out>}}
loc = {file = 0x0, func = 0x0, line = 0}
log_message = {<Throttler> = {_vptr.Throttler = 0x0,
_last_allowed_time = {static _S_min_alignment = 8, static _S_alignment = 8,
_M_i = {<std::chrono::time_point<std::chrono::_V2::system_clock,
std::chrono::duration<long, std::ratio<1, 1000000000> > >> = {__d = {__r = 0}},
<No data fields>}, static is_always_lock_free = <error reading variable: No
global symbol "std::atomic<Throttler::TimePoint>::is_always_lock_free".>},
_interval = {static _S_min_alignment = 8, static _S_alignment = 8, _M_i = {__r
= 0}, static is_always_lock_free = <optimized out>}, _suppressed_count = 0},
_throttling_value_is_explicitly_set = false, _is_throttled = false, static
_default_log_throttling_interval = {static _S_min_alignment = 8, static
_S_alignment = 8, _M_i = {__r = 60000}, static is_always_lock_free = <optimized
out>}, static _default_debug_throttling_interval = {static _S_min_alignment =
8, static _S_alignment = 8, _M_i = {__r = 0}, static is_always_lock_free =
<optimized out>}}
loc = {file = 0x0, func = 0x0, line = 0}
log_message = {<Throttler> = {_vptr.Throttler = 0x0,
_last_allowed_time = {static _S_min_alignment = 8, static _S_alignment = 8,
_M_i = {<std::chrono::time_point<std::chrono::_V2::system_clock,
std::chrono::duration<long, std::ratio<1, 1000000000> > >> = {__d = {__r = 0}},
<No data fields>}, static is_always_lock_free = <error reading variable: No
global symbol "std::atomic<Throttler::TimePoint>::is_always_lock_free".>},
_interval = {static _S_min_alignment = 8, static _S_alignment = 8, _M_i = {__r
= 0}, static is_always_lock_free = <optimized out>}, _suppressed_count = 0},
_throttling_value_is_explicitly_set = false, _is_throttled = false, static
_default_log_throttling_interval = {static _S_min_alignment = 8, static
_S_alignment = 8, _M_i = {__r = 60000}, static is_always_lock_free = <optimized
out>}, static _default_debug_throttling_interval = {static _S_min_alignment =
8, static _S_alignment = 8, _M_i = {__r = 0}, static is_always_lock_free =
<optimized out>}}
#8 0x00000000007e57e8 in write_signal_done (vc=0x7facd401e880,
nh=0x7fad30c5c100, event=3) at UnixNetVConnection.cc:162
No locals.
#9 write_signal_error (lerrno=<optimized out>, vc=0x7facd401e880,
nh=0x7fad30c5c100) at UnixNetVConnection.cc:181
No locals.
#10 write_to_net_io(NetHandler*, UnixNetVConnection*, EThread*) () at
UnixNetVConnection.cc:491
s = 0x7facd401eac8
mutex = 0x1743d50
lock = {m = {m_ptr = 0x183e3a0}, lock_acquired = true}
ntodo = <optimized out>
buf = @0x7facd401eaf0: {mbuf = 0x7fad1c030cb0, entry =
0x7fad1c030cc8}
towrite = <optimized out>
signalled = 1
needs = -2147483644
total_written = 0
r = <optimized out>
#11 0x00000000007d13b6 in NetHandler::process_ready_list
(this=this@entry=0x7fad30c5c100) at UnixNet.cc:432
ne = <optimized out>
#12 0x00000000007d1715 in NetHandler::waitForActivity(long) () at
UnixNet.cc:549
epd = <optimized out>
lock = {m = {m_ptr = 0x1743b70}, locked_p = true}
p = <optimized out>
pd = 0x7fad23dbe010
ne = <optimized out>
__FUNCTION__ = "waitForActivity"
#13 0x00000000008287ea in EThread::execute_regular
(this=this@entry=0x7fad30c58010) at I_PriorityEventQueue.h:115
done_one = <optimized out>
sleep_time = <optimized out>
e = <optimized out>
NegativeQueue = {<DLL<Event, Event::Link_link>> = {head = 0x0}, tail
= 0x0}
next_time = <optimized out>
delta = <optimized out>
loop_start_time = 1619198439859105735
loop_finish_time = <optimized out>
prev_metric = 0x7fad30d5e850
nq_count = 0
ev_count = 0
METRIC_INIT = {_loop_time = {_start = 0, _min = 9223372036854775807,
_max = 0}, _events = {_min = 2147483647, _max = 0, _total = 0}, _count = 0,
_wait = 0}
#14 0x0000000000828a52 in execute (this=0x7fad30c58010) at UnixEThread.cc:364
No locals.
#15 EThread::execute (this=0x7fad30c58010) at UnixEThread.cc:342
No locals.
#16 0x0000000000826e2a in spawn_thread_internal (a=0x1773020) at Thread.cc:92
p = 0x1773020
#17 0x00007fad331b7dd5 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#18 0x00007fad324beb3d in clone () from /lib64/libc.so.6
No symbol table info available.
(gdb)
```
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