--- stack trace ---
#0  0x000055e0cb785679 in Auth::SchemeConfig::CreateAuthUser (proxy_auth=proxy_auth@entry=0x55e0ce03d630 "Basic bHVwcm94eTpuY2k4dUZ1aW4=", al=...) at auth/SchemeConfig.cc:55
        config = 0x55e0cd2183f0
        rmb = {<Packable> = {_vptr.Packable = 0x55e0cbb18b28 <vtable for MemBuf+16>}, static CBDATA_MemBuf = 10, buf = 0x55e0cd99bde0 "", size = 0, max_capacity = 2097152000, capacity = 2048, stolen = 0}
        __FUNCTION__ = <optimized out>
#1  0x000055e0cb789e5d in Auth::UserRequest::authenticate (auth_user_request=0x7fff68e80108, headertype=Http::PROXY_AUTHORIZATION, request=0x55e0ce03b150, conn=0x55e0ce03a7c8, src_addr=..., al=...) at auth/UserRequest.cc:354
        proxy_auth = 0x55e0ce03d630 "Basic bHVwcm94eTpuY2k4dUZ1aW4="
        __FUNCTION__ = <optimized out>
#2  0x000055e0cb78a5bc in Auth::UserRequest::tryToAuthenticateAndSetAuthUser (aUR=0x7fff68e80108, headertype=Http::PROXY_AUTHORIZATION, request=0x55e0ce03b150, conn=0x55e0ce03a7c8, src_addr=..., al=...) at auth/UserRequest.cc:453
        t = {p_ = 0x0}
        result = <optimized out>
#3  0x000055e0cb75fa22 in AuthenticateAcl (ch=<optimized out>) at auth/Acl.cc:57
        checklist = 0x7fff68e7ff70
        request = 0x55e0ce03b150
        headertype = Http::PROXY_AUTHORIZATION
        result = <optimized out>
        __FUNCTION__ = <optimized out>
#4  0x000055e0cb761d39 in ACLProxyAuth::match (this=0x55e0cd21fbd0, checklist=0x7fff68e7ff70) at auth/AclProxyAuth.cc:68
        answer = {code = 32767, kind = -853389256, implicit = 224}
#5  0x000055e0cb7ab467 in ACL::matches (this=this@entry=0x55e0cd21fbd0, checklist=checklist@entry=0x7fff68e7ff70) at acl/Acl.cc:147
        result = 0
        extra = <optimized out>
        __FUNCTION__ = <optimized out>
#6  0x000055e0cb7abd5b in ACLChecklist::matchChild (this=this@entry=0x7fff68e7ff70, current=current@entry=0x55e0cd229540, pos=pos@entry=0x55e0cd21fbd0, child=0x55e0cd21fbd0) at acl/Checklist.cc:94
        result = false
#7  0x000055e0cb7abff1 in Acl::NotNode::doMatch (this=0x55e0cd229540, checklist=0x7fff68e7ff70, start=0x55e0cd21fbd0) at acl/BoolOps.cc:43
No locals.
#8  0x000055e0cb7ab467 in ACL::matches (this=this@entry=0x55e0cd229540, checklist=checklist@entry=0x7fff68e7ff70) at acl/Acl.cc:147
        result = 0
        extra = <optimized out>
        __FUNCTION__ = <optimized out>
#9  0x000055e0cb7abd5b in ACLChecklist::matchChild (this=this@entry=0x7fff68e7ff70, current=current@entry=0x55e0cd2293c0, pos=pos@entry=0x55e0cd229540, child=0x55e0cd229540) at acl/Checklist.cc:94
        result = false
#10 0x000055e0cb7ac05b in Acl::AndNode::doMatch (this=0x55e0cd2293c0, checklist=0x7fff68e7ff70, start=...) at acl/BoolOps.cc:95
        i = 0x55e0cd229540
#11 0x000055e0cb7ab467 in ACL::matches (this=this@entry=0x55e0cd2293c0, checklist=checklist@entry=0x7fff68e7ff70) at acl/Acl.cc:147
        result = 0
        extra = <optimized out>
        __FUNCTION__ = <optimized out>
#12 0x000055e0cb7abd5b in ACLChecklist::matchChild (this=this@entry=0x7fff68e7ff70, current=current@entry=0x55e0cd229258, pos=pos@entry=0x55e0cd2293c0, child=0x55e0cd2293c0) at acl/Checklist.cc:94
        result = false
#13 0x000055e0cb7ac0d6 in Acl::OrNode::doMatch (this=0x55e0cd229258, checklist=0x7fff68e7ff70, start=...) at acl/BoolOps.cc:139
        i = 0x55e0cd2293c0
#14 0x000055e0cb7ab467 in ACL::matches (this=0x55e0cd229258, checklist=checklist@entry=0x7fff68e7ff70) at acl/Acl.cc:147
        result = 0
        extra = <optimized out>
        __FUNCTION__ = <optimized out>
#15 0x000055e0cb7ac844 in ACLChecklist::matchAndFinish (this=this@entry=0x7fff68e7ff70) at acl/Checklist.cc:296
        result = false
#16 0x000055e0cb7afd38 in ACLChecklist::fastCheck (this=0x7fff68e7ff70) at acl/Checklist.cc:346
        acl = 0x55e0cd229258
        __FUNCTION__ = <optimized out>
#17 0x000055e0cb5bb1f1 in DelayId::DelayClient (http=0x55e0cdfb36b8, reply=0x0) at ./src/DelayId.cc:104
        ch = {<ACLChecklist> = {_vptr.ACLChecklist = 0x55e0cbb131c0 <vtable for ACLFilledChecklist+16>, accessList = 0x55e0cd229258, callback = 0x0, callback_data = 0x0, asyncCaller_ = false, occupied_ = true, finished_ = false, answer_ = {code = ACCESS_DENIED, kind = 0, implicit = false}, asyncStage_ = ACLChecklist::asyncNone, state_ = 0x55e0cbb2e798 <ACLChecklist::NullState::_instance>, matchLoc_ = {parent = 0x55e0cd229540, position = 0x55e0cd21fbd0}, asyncLoc_ = {parent = 0x0, position = non-dereferenceable iterator for std::vector}, asyncLoopDepth_ = 0, matchPath = std::stack wrapping: std::deque with 0 elements, bannedActions_ = std::vector of length 0, capacity 0}, static CBDATA_ACLFilledChecklist = 22, src_addr = {mSocketAddr_ = {sin6_family = 10, sin6_port = 55455, sin6_flowinfo = 0, sin6_addr = {__in6_u = {__u6_addr8 = "\000\000\000\000\000\000\000\000\000\000\377\377\300\250\002\020", __u6_addr16 = {0, 0, 0, 0, 0, 65535, 43200, 4098}, __u6_addr32 = {0, 0, 4294901760, 268609728}}}, sin6_scope_id = 0}, static STRLEN_IP4A = 16, static STRLEN_IP4R = 28, static STRLEN_IP4S = 21, static MAX_IP4_STRLEN = 28, static STRLEN_IP6A = 42, static STRLEN_IP6R = 75, static STRLEN_IP6S = 48, static MAX_IP6_STRLEN = 75}, dst_addr = {mSocketAddr_ = {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}, static STRLEN_IP4A = 16, static STRLEN_IP4R = 28, static STRLEN_IP4S = 21, static MAX_IP4_STRLEN = 28, static STRLEN_IP6A = 42, static STRLEN_IP6R = 75, static STRLEN_IP6S = 48, static MAX_IP6_STRLEN = 75}, my_addr = {mSocketAddr_ = {sin6_family = 10, sin6_port = 14348, sin6_flowinfo = 0, sin6_addr = {__in6_u = {__u6_addr8 = "\000\000\000\000\000\000\000\000\000\000\377\377\300\250", <incomplete sequence \346>, __u6_addr16 = {0, 0, 0, 0, 0, 65535, 43200, 58882}, __u6_addr32 = {0, 0, 4294901760, 3858933952}}}, sin6_scope_id = 0}, static STRLEN_IP4A = 16, static STRLEN_IP4R = 28, static STRLEN_IP4S = 21, static MAX_IP4_STRLEN = 28, static STRLEN_IP6A = 42, static STRLEN_IP6R = 75, static STRLEN_IP6S = 48, static MAX_IP6_STRLEN = 75}, dst_peer_name = {static npos = 4294967295, static maxSize = 268435455, id = {value = 15856}, store_ = {p_ = 0x55e0cd1ff960}, off_ = 0, len_ = 0}, dst_rdns = 0x0, request = 0x55e0ce03b150, reply = 0x0, rfc931 = '\000' <repeats 32 times>, "\377\377\377\377\000\000\000\000XT\262\313\340U", '\000' <repeats 17 times>, auth_user_request = {p_ = 0x0}, snmp_community = 0x0, sslErrors = 0x55e0cb749710 <tunnelTimeout(CommTimeoutCbParams const&)>, serverCert = std::shared_ptr<gnutls_x509_crt_int> (empty) = {get() = 0x0}, al = {p_ = 0x0}, extacl_entry = {p_ = 0x0}, requestErrorType = ERR_MAX, conn_ = 0x55e0ce03a7c8, fd_ = -1, destinationDomainChecked_ = false, sourceDomainChecked_ = false}
        r = 0x55e0ce03b150
        pool = 1
        __FUNCTION__ = <optimized out>
#18 0x000055e0cb74e608 in tunnelStart (http=0x55e0cdfb36b8) at ./src/tunnel.cc:1145
        tunnelState = 0x55e0ce03e238
        err = 0x0
        request = 0x55e0ce03b150
        url = <optimized out>
        __FUNCTION__ = <optimized out>
#19 0x000055e0cb6a8569 in ClientHttpRequest::doCallouts (this=<optimized out>) at ./src/client_side_request.cc:1901
        ih = {p_ = 0x7a3441ee011bc900}
        __FUNCTION__ = <optimized out>
#20 0x000055e0cb7af306 in ACLChecklist::checkCallback (this=0x55e0cda48878, answer=...) at acl/Checklist.cc:169
        callback_ = 0x55e0cb6ad1b0 <checkNoCacheDoneWrapper(Acl::Answer, void*)>
        cbdata_ = 0x55e0cda487d8
        __FUNCTION__ = <optimized out>
#21 0x000055e0cb6ab3c1 in ClientRequestContext::clientAccessCheck2 (this=0x55e0cda487d8) at ./src/client_side_request.cc:724
        __FUNCTION__ = <optimized out>
#22 ClientRequestContext::clientAccessCheck2 (this=0x55e0cda487d8) at ./src/client_side_request.cc:717
        __FUNCTION__ = <optimized out>
        _dbg_level = <optimized out>
        _dbo = <optimized out>
#23 0x000055e0cb6ab253 in clientAccessCheckDoneWrapper (answer=..., data=data@entry=0x55e0cda487d8) at ./src/client_side_request.cc:736
        calloutContext = 0x55e0cda487d8
#24 0x000055e0cb7af306 in ACLChecklist::checkCallback (this=0x55e0cda51e98, answer=...) at acl/Checklist.cc:169
        callback_ = 0x55e0cb6ab200 <clientAccessCheckDoneWrapper(Acl::Answer, void*)>
        cbdata_ = 0x55e0cda487d8
        __FUNCTION__ = <optimized out>
#25 0x000055e0cb6a9b5c in ClientRequestContext::hostHeaderVerify (this=0x55e0cda487d8) at ./src/client_side_request.cc:674
        host = 0x55e0ce02dcf0 "esm.ubuntu.com"
        portStr = <optimized out>
        hostB = 0x55e0ce02dcf0 "esm.ubuntu.com"
        port = <optimized out>
        __FUNCTION__ = <optimized out>
#26 0x000055e0cb685419 in clientProcessRequest (conn=0x55e0ce03a7c8, hp=..., context=<optimized out>) at ./src/client_side.cc:1794
        http = 0x55e0cdfb36b8
        mustReplyToOptions = <optimized out>
        expectBody = <optimized out>
        request = {p_ = 0x55e0ce03b150}
        isFtp = false
        unsupportedTe = <optimized out>
        chunked = <optimized out>
        __FUNCTION__ = <optimized out>
#27 0x000055e0cb800bff in Http::One::Server::processParsedRequest (this=0x55e0ce03a7c8, context=...) at servers/Http1Server.cc:292
        http = 0x55e0cdfb36b8
        request = {p_ = 0x55e0ce03b150}
        __FUNCTION__ = <optimized out>
#28 0x000055e0cb68178a in ConnStateData::clientParseRequests (this=0x55e0ce03a7c8) at ./src/client_side.cc:1986
        context = {p_ = 0x55e0ce02e7a0}
        parsed_req = <optimized out>
        __FUNCTION__ = <optimized out>
#29 0x000055e0cb681de7 in ConnStateData::afterClientRead (this=0x55e0ce03a7c8) at ./src/client_side.cc:2020
        __FUNCTION__ = <optimized out>
#30 0x000055e0cb803b89 in Server::doClientRead (this=0x55e0ce03a7c8, io=...) at servers/Server.cc:181
        rd = {<CommCommonCbParams> = {data = 0x55e0ce03a7c8, conn = {p_ = 0x55e0ce03a600}, flag = Comm::OK, xerrno = 0, fd = -1}, buf = 0x0, size = 118}
        __FUNCTION__ = <optimized out>
#31 0x000055e0cb5f4dba in CommCbMemFunT<Server, CommIoCbParams>::doDial (this=<optimized out>) at ./src/CommCalls.h:205
No locals.
#32 JobDialer<Server>::dial (call=..., this=<optimized out>) at base/AsyncJobCalls.h:175
        __FUNCTION__ = <optimized out>
#33 AsyncCallT<CommCbMemFunT<Server, CommIoCbParams> >::fire (this=0x55e0cdfb7b40) at ../src/base/AsyncCall.h:145
No locals.
#34 0x000055e0cb81947b in AsyncCallQueue::fireNext (this=<optimized out>) at base/../../src/base/RefCount.h:73
        call = {p_ = 0x55e0cdfb7b40}
        __FUNCTION__ = <optimized out>
#35 0x000055e0cb81b1aa in AsyncCallQueue::fire (this=0x55e0cd4f5320) at base/AsyncCallQueue.cc:43
        made = true
#36 0x000055e0cb5f5180 in EventLoop::dispatchCalls (this=0x7fff68e810e0) at ./src/EventLoop.cc:144
        dispatchedSome = <optimized out>
#37 EventLoop::runOnce (this=0x7fff68e810e0) at ./src/EventLoop.cc:121
        sawActivity = <optimized out>
        waitingEngine = 0x7fff68e81020
        __FUNCTION__ = <optimized out>
#38 0x000055e0cb6fd7e8 in EventLoop::run (this=0x7fff68e810e0) at ./src/EventLoop.cc:83
No locals.
#39 SquidMain (argc=<optimized out>, argv=<optimized out>) at ./src/main.cc:1718
        cmdLine = {argv_ = std::vector of length 6, capacity 6 = {0x55e0cd1e3220 "(squid-1)", 0x55e0cd1e32e0 "--kid", 0x55e0cd1e33a0 "squid-1", 0x55e0cd1e3460 "--foreground", 0x55e0cd1e3520 "-sYC", 0x0}, shortOptions_ = 0x55e0cd20e030 "CDFNRSYXa:d:f:hk:m::n:sl:u:vz?", longOptions_ = std::vector of length 5, capacity 8 = {{<option> = {name = 0x55e0cd1e3cc0 "foreground", has_arg = 0, flag = 0x0, val = 2}, <No data fields>}, {<option> = {name = 0x55e0cd1e38e0 "kid", has_arg = 1, flag = 0x0, val = 3}, <No data fields>}, {<option> = {name = 0x55e0cd1e39a0 "help", has_arg = 0, flag = 0x0, val = 104}, <No data fields>}, {<option> = {name = 0x55e0cd1e3a80 "version", has_arg = 0, flag = 0x0, val = 118}, <No data fields>}, {<option> = {name = 0x0, has_arg = 0, flag = 0x0, val = 0}, <No data fields>}}}
        WIN32_init_err = 0
        mainLoop = {errcount = 0, static Running = 0x7fff68e810e0, last_loop = false, engines = std::vector of length 4, capacity 4 = {0x7fff68e81060, 0x55e0cbb2efd0 <EventScheduler::_instance>, 0x7fff68e81040, 0x7fff68e81020}, timeService = 0x7fff68e80f78, primaryEngine = 0x7fff68e81020, loop_delay = 0, error = false, runOnceResult = false}
        signalEngine = {<AsyncEngine> = {_vptr.AsyncEngine = 0x55e0cbb280b8 <vtable for SignalEngine+16>}, <No data fields>}
        store_engine = {<AsyncEngine> = {_vptr.AsyncEngine = 0x55e0cbb0e570 <vtable for StoreRootEngine+16>}, <No data fields>}
        comm_engine = {<AsyncEngine> = {_vptr.AsyncEngine = 0x55e0cbb28090 <vtable for CommSelectEngine+16>}, <No data fields>}
        time_engine = {_vptr.TimeEngine = 0x55e0cbb28518 <vtable for TimeEngine+16>}
        __FUNCTION__ = <optimized out>
#40 0x000055e0cb59a576 in SquidMainSafe (argv=0x7fff68e813f8, argc=5) at ./src/main.cc:1405
        __FUNCTION__ = <optimized out>
#41 main (argc=5, argv=0x7fff68e813f8) at ./src/main.cc:1393
No locals.