I had a look at the core dump. Going up a frame in the stack I see the call
```
#0 XrdSutBucket::XrdSutBucket (this=0x7f1830049960, b=...) at /usr/src/debug/xrootd/xrootd/src/XrdSut/XrdSutBucket.cc:85
85 membuf = new char[b.size];
(gdb) up
#1 0x00007f18366f582e in XrdSecProtocolgsi::ClientDoInit (this=0x7f1830005240, br=<optimized out>, bm=<optimized out>, emsg=...) at /usr/src/debug/xrootd/xrootd/src/XrdSecgsi/XrdSecProtocolgsi.cc:3085
3085 hs->Cbck = new XrdSutBucket(*((XrdSutBucket *)(po.cbck)));
```
Inspecting a bit further, I see that po.cbck is null:
```
(gdb) p po
$5 = {chain = 0x7f18300468d0, ksig = 0x7f1830048df0, cbck = 0x0}
```
So the problem is that a null pointer is being dereferenced to call the constructor of `XrdSutBucket::XrdSutBucket`.
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