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Saw same backtrace again, this time
* with updated xrootd-libs-4.8.3-1.el6 (as invoked from the "eos" shell).
* in batch mode, i.e not some potentially long-running interactive command
```
:Core was generated by `eos root://cmseos.fnal.gov/ ls /store/user/USER/DIR'.
:Program terminated with signal 11, Segmentation fault.
:#0  0x00007fa7548bf933 in XrdOucHash<XrdCryptoX509Crl>::Find(char const*, long*) () from /usr/lib64/libXrdSecgsi-4.so
:#0  0x00007fa7548bf933 in XrdOucHash<XrdCryptoX509Crl>::Find(char const*, long*) () from /usr/lib64/libXrdSecgsi-4.so
:#1  0x00007fa7548ab5d1 in XrdSecProtocolgsi::Delete() () from /usr/lib64/libXrdSecgsi-4.so
:#2  0x00007fa75f507c7f in XrdCl::XRootDTransport::GetCredentials(XrdSecBuffer*&, XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) () from /usr/lib64/libXrdCl.so.2
:#3  0x00007fa75f5087e9 in XrdCl::XRootDTransport::DoAuthentication(XrdCl::HandShakeData*, XrdCl::XRootDChannelInfo*) () from /usr/lib64/libXrdCl.so.2
:#4  0x00007fa75f509176 in XrdCl::XRootDTransport::HandShakeMain(XrdCl::HandShakeData*, XrdCl::AnyObject&) () from /usr/lib64/libXrdCl.so.2
:#5  0x00007fa75f509343 in XrdCl::XRootDTransport::HandShake(XrdCl::HandShakeData*, XrdCl::AnyObject&) () from /usr/lib64/libXrdCl.so.2
:#6  0x00007fa75f55029b in XrdCl::AsyncSocketHandler::OnReadWhileHandshaking() () from /usr/lib64/libXrdCl.so.2
:#7  0x00007fa75f550618 in XrdCl::AsyncSocketHandler::Event(unsigned char, XrdCl::Socket*) () from /usr/lib64/libXrdCl.so.2
:#8  0x00007fa75f4fb143 in ?? () from /usr/lib64/libXrdCl.so.2
:#9  0x00007fa75f026bb8 in XrdSys::IOEvents::Poller::CbkXeq(XrdSys::IOEvents::Channel*, int, int, char const*) () from /usr/lib64/libXrdUtils.so.2
:#10 0x00007fa75f026d89 in XrdSys::IOEvents::PollE::Dispatch(XrdSys::IOEvents::Channel*, unsigned int) () from /usr/lib64/libXrdUtils.so.2
:#11 0x00007fa75f027013 in XrdSys::IOEvents::PollE::Begin(XrdSysSemaphore*, int&, char const**) () from /usr/lib64/libXrdUtils.so.2
:#12 0x00007fa75f0257cd in XrdSys::IOEvents::BootStrap::Start(void*) () from /usr/lib64/libXrdUtils.so.2
:#13 0x00007fa75f022a6f in XrdSysThread_Xeq () from /usr/lib64/libXrdUtils.so.2
:#14 0x00007fa75e9fcaa1 in start_thread () from /lib64/libpthread.so.0
:#15 0x00007fa75d4ffbcd in clone () from /lib64/libc.so.6

:May 23 20:43:57 lxplus057 kernel: eos[2861]: segfault at 3d8 ip 00007fa7548bf933 sp 00007fa757ed98f0 error 4 in libXrdSecgsi-4.so[7fa75489f000+29000]
:May 23 20:43:58 lxplus057 abrt[3915]: Saved core dump of pid 2858 (/usr/bin/eos) to /var/spool/abrt/ccpp-2018-05-23-20:43:57-2858 (54841344 bytes)
```

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