This happens on xrootd cache cluster at UCSD (11 machines, xcache-00 to 10) so this is heavily loaded. Let me know if you need more info.

(gdb) bt
#0 0x00007f90e85e01f7 in raise () from /lib64/libc.so.6
#1 0x00007f90e85e18e8 in abort () from /lib64/libc.so.6
#2 0x00007f90e8ee6ac5 in __gnu_cxx::__verbose_terminate_handler() ()
from /lib64/libstdc++.so.6
#3 0x00007f90e8ee4a36 in ?? () from /lib64/libstdc++.so.6
#4 0x00007f90e8ee4a63 in std::terminate() () from /lib64/libstdc++.so.6
#5 0x00007f90e8ee4c83 in __cxa_throw () from /lib64/libstdc++.so.6
#6 0x00007f90e8f399e7 in std::__throw_length_error(char const*) ()
from /lib64/libstdc++.so.6
#7 0x00007f90e8f43d12 in std::string::_Rep::_S_create(unsigned long, unsigned long, std::allocator const&) () from /lib64/libstdc++.so.6
#8 0x00007f90e8f4490b in std::string::_Rep::_M_clone(std::allocator const&, unsigned long) () from /lib64/libstdc++.so.6
#9 0x00007f90e8f44fdc in std::basic_string<char, std::char_traits, std::allocator >::basic_string(std::string const&) ()
from /lib64/libstdc++.so.6
#10 0x00007f90e6076144 in GetHostId (this=)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClURL.hh:78
#11 XrdCl::FileStateHandler::OnOpen (this=0x7f8f945ac430,
status=status@entry=0x7f8ed4083cd0, openInfo=0x7f8ed4083540,
hostList=hostList@entry=0x7f909c189f00)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClFileStateHandler.cc:1187
#12 0x00007f90e6076c1b in (anonymous namespace)::OpenHandler::HandleResponseWithHosts (this=0x7f909c1882d0, status=0x7f8ed4083cd0,
response=0x7f8ed4083520, hostList=0x7f909c189f00)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClFileStateHandler.cc:84
#13 0x00007f90e6057c3b in XrdCl::XRootDMsgHandler::HandleResponse (
this=this@entry=0x7f909c18a840)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClXRootDMsgHandler.cc:1128
#14 0x00007f90e605bd2f in XrdCl::XRootDMsgHandler::Process (
this=0x7f909c18a840, msg=0x7f90341817b0)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClXRootDMsgHandler.cc:375
#15 0x00007f90e603d29e in XrdCl::Stream::HandleIncMsgJob::Run (
this=0x7f903417ac20, arg=)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClStream.hh:284
#16 0x00007f90e60a0f3f in XrdCl::JobManager::RunJobs (this=0x7f90d0003680)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClJobManager.cc:148
#17 0x00007f90e60a1199 in RunRunnerThread (arg=)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClJobManager.cc:33
#18 0x00007f90e939de25 in start_thread () from /lib64/libpthread.so.0
#19 0x00007f90e86a334d in clone () from /lib64/libc.so.6

(gdb) up 11
#11 XrdCl::FileStateHandler::OnOpen (this=0x7f8f945ac430,
status=status@entry=0x7f8ed4083cd0, openInfo=0x7f8ed4083540,
hostList=hostList@entry=0x7f909c189f00)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClFileStateHandler.cc:1187
1187 std::string lastServer = pFileUrl->GetHostId();
(gdb) p pFileUrl
$1 = (XrdCl::URL *) 0x7f909c187730
(gdb) p *pFileUrl
$2 = {
pHostId = "094AODv2\221\000\000\000\000\000\000\000\200\330\030\234\220\177\000\000 w\030\234\220\177\000\000\376\377\377\377\060\060_T/store/data/Run2016H/SingleElectron/MINIAOD/03Feb2017_ver2-v1/100000/5E9343DB-47EC-E611-B36F-0090FA9DFD5\220\000\000\000\000\000\000\000D\000\000\000\000\000\000\000\300Z\030\234\220\177\000\000\320Z\030\234\220\177", '\000' <repeats 18 times>, "x\314\030\234\220\177\000\000"...<Address 0x7f909ca86000 out of bounds>,
pProtocol = "", pUserName = "948", pPassword = "",
pHostName = "cmsxrootd.fnal.gov", pPort = 1094, pPath = "",
pParams = std::map with 2 elements = {["oss.lcl"] = "1",
["tried"] = "xcache-08.t2.ucsd.edu"},
pURL = "root:[log in to unmask]:1094//store/data/Run2016H/SingleElectron/MINIAOD/03Feb2017_ver2-v1/100000/5E9343DB-47EC-E611-B36F-0090FA9DFD5A.root?oss.lcl=1&tried=xcache-08.t2.ucsd.edu"}

(gdb) down
#10 0x00007f90e6076144 in GetHostId (this=)
at /usr/src/debug/xrootd-4.8.1/src/XrdCl/XrdClURL.hh:78
78 return pHostId;
(gdb) info locals
No locals.
(gdb) p pHostId
value has been optimized out

Note - pHostId in pFileUrl looks strange

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