reproducer: Build xrootd server (or just libXrdServer.so.3) with diff from issue-1898-reproduce.txt, run e.g. standalone server, attach to server process with gdb and let it continue. Run a transfer, e.g.

 xrdcp -f root://pmpe01:1194//f1 /dev/null 

The attached xrootd process usually crashes about 2 seconds after transfer. Similar trace to original:

(gdb) where
#0  0x00007f801600296b in XrdXrootdMonFile::GetSlot (slotSZ=<optimized out>) at /usr/include/bits/byteswap.h:47
#1  0x00007f8016002af3 in XrdXrootdMonFile::Close (fsP=<optimized out>, isDisc=<optimized out>)
    at /data/dhsmith/xrootd4/xrootd-asyncclosedelracefix/src/XrdXrootd/XrdXrootdMonFile.cc:169
#2  0x00007f8015ffffbb in XrdXrootdFileTable::Del(XrdXrootdMonitor*, int, bool) ()
[...]


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