OK, here we go - hope this helps..
```
(gdb) bt
#0 0x00007fd7c4fec704 in XrdOucHash<XrdSutCacheEntry>::Find (this=0x7fd7c51f5a90, KeyVal=0x7fd7c54b1b60 "5168735f.0:1", KeyTime=0x0) at /usr/src/debug/xrootd-4.8.3/src/XrdOuc/XrdOucHash.icc:173
#1 0x00007fd7c4fdf3cc in Get (cahash=0x7fd7c54320f0 "5168735f.0", cf=0x7fd7c47ff640, hs=0x7fd7c542f160) at /usr/src/debug/xrootd-4.8.3/src/XrdSut/XrdSutCache.hh:97
#2 XrdSecProtocolgsi::GetCA (cahash=0x7fd7c54320f0 "5168735f.0", cf=0x7fd7c47ff640, hs=0x7fd7c542f160) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:4264
#3 0x00007fd7c4fe032b in XrdSecProtocolgsi::ParseCAlist (this=0x7fd7c5447500, calist=...) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:4530
#4 0x00007fd7c4fe7ffa in XrdSecProtocolgsi::ClientDoInit (this=0x7fd7c5447500, br=<value optimized out>, bm=<value optimized out>, emsg=...) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:2896
#5 0x00007fd7c4fe855d in XrdSecProtocolgsi::ParseClientInput (this=<value optimized out>, br=0x7fd7c54351d0, bm=0x7fd7d13fd8d0, cmsg=...) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:2807
#6 0x00007fd7c4fe892e in XrdSecProtocolgsi::getCredentials (this=0x7fd7c5447500, parm=<value optimized out>, ei=0x7fd7d13fd970) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:1379
#7 0x00007fd7da988c31 in XrdCl::XRootDTransport::GetCredentials (this=<value optimized out>, credentials=@0x7fd7d13fe230, hsData=0x7fd7d38693d0, info=0x7fd7d386a3c0) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClXRootDTransport.cc:1879
#8 0x00007fd7da9897e9 in XrdCl::XRootDTransport::DoAuthentication (this=0x7fd7d384c5e0, hsData=0x7fd7d38693d0, info=0x7fd7d386a3c0) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClXRootDTransport.cc:1650
#9 0x00007fd7da98a176 in XrdCl::XRootDTransport::HandShakeMain (this=0x7fd7d384c5e0, handShakeData=0x7fd7d38693d0, channelData=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClXRootDTransport.cc:417
#10 0x00007fd7da98a343 in XrdCl::XRootDTransport::HandShake (this=0x7fd7d384c5e0, handShakeData=0x7fd7d38693d0, channelData=...) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClXRootDTransport.cc:326
#11 0x00007fd7da9d129b in XrdCl::AsyncSocketHandler::OnReadWhileHandshaking (this=0x7fd7d386a280) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClAsyncSocketHandler.cc:779
#12 0x00007fd7da9d1618 in XrdCl::AsyncSocketHandler::Event (this=0x7fd7d386a280, type=1 '\001') at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClAsyncSocketHandler.cc:234
#13 0x00007fd7da97c143 in (anonymous namespace)::SocketCallBack::Event (this=0x7fd7d384c560, chP=<value optimized out>, cbArg=<value optimized out>, evFlags=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdCl/XrdClPollerBuiltIn.cc:82
#14 0x00007fd7da6cabb8 in XrdSys::IOEvents::Poller::CbkXeq (this=0x7fd7d3bed1e0, cP=0x7fd7d3839200, events=1, eNum=0, eTxt=0x0) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEvents.cc:693
#15 0x00007fd7da6cad89 in XrdSys::IOEvents::PollE::Dispatch (this=0x7fd7d3bed1e0, cP=0x7fd7d3839200, pollEv=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEventsPollE.icc:270
#16 0x00007fd7da6cb013 in XrdSys::IOEvents::PollE::Begin (this=0x7fd7d3bed1e0, syncsem=<value optimized out>, retcode=<value optimized out>, eTxt=<value optimized out>) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEventsPollE.icc:225
#17 0x00007fd7da6c97cd in XrdSys::IOEvents::BootStrap::Start (parg=0x7fff7aae6600) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysIOEvents.cc:131
#18 0x00007fd7da6c6a6f in XrdSysThread_Xeq (myargs=0x7fd7d384c7e0) at /usr/src/debug/xrootd-4.8.3/src/XrdSys/XrdSysPthread.cc:86
#19 0x00007fd7da485aa1 in start_thread () from /lib64/libpthread.so.0
#20 0x00007fd7d7e00bcd in clone () from /lib64/libc.so.6
#0 0x00007fd7c4fec704 in XrdOucHash<XrdSutCacheEntry>::Find (this=0x7fd7c51f5a90, KeyVal=0x7fd7c54b1b60 "5168735f.0:1", KeyTime=0x0) at /usr/src/debug/xrootd-4.8.3/src/XrdOuc/XrdOucHash.icc:173
173 if ((hip = hashtable[kent]))
(gdb) info locals
khash = 6273236213436711438
kent = 126
hip = <value optimized out>
lifetime = 0
phip = <value optimized out>
(gdb) print hashtable[kent]
Cannot access memory at address 0x3f0
(gdb) print hashtable
$1 = (XrdOucHash_Item<XrdSutCacheEntry> **) 0x0
(gdb) up
#1 0x00007fd7c4fdf3cc in Get (cahash=0x7fd7c54320f0 "5168735f.0", cf=0x7fd7c47ff640, hs=0x7fd7c542f160) at /usr/src/debug/xrootd-4.8.3/src/XrdSut/XrdSutCache.hh:97
97 if (!(cent = table.Find(tag))) {
(gdb) print table
$2 = {hashtable = 0x0, prevtablesize = 89, hashtablesize = 144, hashnum = 0, hashmax = 115, hashload = 80}
(gdb) up
#2 XrdSecProtocolgsi::GetCA (cahash=0x7fd7c54320f0 "5168735f.0", cf=0x7fd7c47ff640, hs=0x7fd7c542f160) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:4264
4264 XrdSutCacheEntry *cent = cacheCA.Get(tag.c_str(), rdlock, GetCACheck, (void *) &arg);
(gdb) print tag
$3 = {_vptr.XrdOucString = 0x749050, str = 0x7fd7c54b1b60 "5168735f.0:1", len = 12, siz = 21, static blksize = -1}
(gdb) print arg
$4 = {arg1 = 1, arg2 = 86400, arg3 = 1527719441, arg4 = -1}
(gdb) up
#3 0x00007fd7c4fe032b in XrdSecProtocolgsi::ParseCAlist (this=0x7fd7c5447500, calist=...) at /usr/src/debug/xrootd-4.8.3/src/XrdSecgsi/XrdSecProtocolgsi.cc:4530
4530 if (GetCA(cahash.c_str(), sessionCF, hs) == 0)
(gdb) print cahash
$5 = {_vptr.XrdOucString = 0x749050, str = 0x7fd7c54320f0 "5168735f.0", len = 10, siz = 11, static blksize = -1}
```
This CA cert file has apparently /not/ been changed around the time of the crash:
```
~$ locate 5168735f.0 | xargs ls -l
lrwxrwxrwx. 1 root root 15 May 22 09:23 /etc/grid-security/certificates/5168735f.0 -> CERN-GridCA.pem
-r--r--r--. 1 root root 3341 May 17 08:02 /etc/openldap/cacerts/5168735f.0
-r--r--r--. 1 root root 3341 May 17 08:02 /etc/pki/tls/certs/5168735f.0
~$ ls -l /etc/grid-security/certificates/CERN-GridCA.pem
-rw-r--r--. 1 root root 3341 May 4 19:26 /etc/grid-security/certificates/CERN-GridCA.pem
```
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