Don't have the actual "abort" message, but I guess this was something about the array-like access to vb[0]?

Core was generated by `xrd eosuser.cern.ch existfile /eos/user/C/CHANGED/atlas/h019/mc16a/stage/LowHig'.
Program terminated with signal 6, Aborted.
(gdb) bt
#0  0x00007fb2d97ac495 in raise () from /lib64/libc.so.6
#1  0x00007fb2d97adc75 in abort () from /lib64/libc.so.6
#2  0x00000000004095c6 in At (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdClientVector.hh:306
#3  operator[] (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdClientVector.hh:312
#4  executeExistFile (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdCommandLine.cc:976
#5  0x000000000040cb77 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdCommandLine.cc:1943
(gdb) f 2
#2  0x00000000004095c6 in At (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdClientVector.hh:306
306	                             static_cast<unsigned long>(size))) abort();
(gdb) f 4
#4  executeExistFile (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdCommandLine.cc:976
976	        if (vb[0] && (vb.GetSize() >= 1))
(gdb) print vb
$1 = {sizeof_t = 4, rawdata = 0x1e7a8c0 "x\203\260ٲ\177", index = 0x1e7afb0, holecount = 0, size = 0, mincap = 128, capacity = 128, maxsize = 128}
(gdb) print vb[0]
Could not find operator[].
(gdb) f 2
#2  0x00000000004095c6 in At (tkzer=<value optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdClient/XrdClientVector.hh:306
306	                             static_cast<unsigned long>(size))) abort();
(gdb) l
303	    // Bounded array like access
304	    inline T &At(int pos) {
305	           if ((pos < 0) || (static_cast<unsigned long>(pos) >=
306	                             static_cast<unsigned long>(size))) abort();
307	
308		return *( reinterpret_cast<T*>(rawdata + index[pos].offs));
309	    }
310

Version:
pkg_name: xrootd-client
pkg_release: 1.el6
pkg_vendor: Scientific Linux CERN, http://cern.ch/linux
pkg_version: 4.8.1

var_log_messages:
:Apr 3 20:16:32 lxplus020 abrt[16040]: Saved core dump of pid 16037 (/usr/bin/xrd) to /var/spool/abrt/ccpp-2018-04-03-20:16:31-16037 (27258880 bytes)
:Apr 3 20:16:32 lxplus020 abrt[16046]: Not saving repeating crash in '/usr/bin/xrd'
:Apr 3 20:16:32 lxplus020 abrt[16050]: Not saving repeating crash in '/usr/bin/xrd'
:Apr 3 20:16:32 lxplus020 abrt[16054]: Not saving repeating crash in '/usr/bin/xrd'

lxplus020 $ repoquery --location xrootd-client
http://linuxsoft.cern.ch/internal/repos/eos6-stable/x86_64/os/Packages/xrootd-client-4.8.1-1.el6.x86_64.rpm

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