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Here is the backtrace:

(gdb) bt
#0  XrdPssSys::P2URL (retc=@0x7ffff5b4c32c, pbuff=0x7ffff5b4b320 "", 
pblen=4096, path=<value optimized out>, Split=0, Cgi=0x7ffff554777c 
"oss.lcl=1", CgiLn=9, Ident=0x66a414 ":37@xrootd-proxy", doN2N=1) at 
/home/alja/xrd/newcl/xrootd-src/src/XrdPss/XrdPss.cc:893
#1  0x00007ffff5544107 in XrdPssFile::Open (this=0x7fffcc001960, 
path=0x7fffcc000c00 "/store/user/alja/data.root", Oflag=0, Mode=384, 
Env=...) at /home/alja/xrd/newcl/xrootd-src/src/XrdPss/XrdPss.cc:611
#2  0x00007ffff79b8d21 in XrdOfsFile::open (this=0x7fffcc001010, 
path=0x7fffcc000c00 "/store/user/alja/data.root", open_mode=0, Mode=384, 
client=0x7fffcc000980, info=0x0) at 
/home/alja/xrd/newcl/xrootd-src/src/XrdOfs/XrdOfs.cc:626
#3  0x0000000000428fd2 in XrdXrootdProtocol::do_Open (this=<value 
optimized out>) at 
/home/alja/xrd/newcl/xrootd-src/src/XrdXrootd/XrdXrootdXeq.cc:1169
#4  0x00007ffff7787529 in XrdLink::DoIt (this=0x66a358) at 
/home/alja/xrd/newcl/xrootd-src/src/Xrd/XrdLink.cc:396
#5  0x00007ffff778b425 in XrdScheduler::Run (this=0x7ffff7ddca60) at 
/home/alja/xrd/newcl/xrootd-src/src/Xrd/XrdScheduler.cc:307
#6  0x00007ffff778b619 in XrdStartWorking (carg=<value optimized out>) 
at /home/alja/xrd/newcl/xrootd-src/src/Xrd/XrdScheduler.cc:84
#7  0x00007ffff77573af in XrdSysThread_Xeq (myargs=0x6494a0) at 
/home/alja/xrd/newcl/xrootd-src/src/XrdSys/XrdSysPthread.cc:86
#8  0x00007ffff731b851 in start_thread () from /lib64/libpthread.so.0
#9  0x00007ffff66c190d in clone () from /lib64/libc.so.6

(gdb) n
894            if ((idP = index(idBuff, '@'))) {*(idP+1) = 0; theID = 
idBuff;}
(gdb) l
889     // If we have an Ident then usethe fd number as the userid. This 
allows us to
890     // have one stream per open connection.
891     //
892        if (Ident && (Ident = index(Ident, ':')))
893           {strncpy(idBuff, Ident+1, 7); idBuff[7] = 0;
894            if ((idP = index(idBuff, '@'))) {*(idP+1) = 0; theID = 
idBuff;}
895           }
896
897     // Format the header into the buffer and check if we overflowed. 
Note that there
898     // can be a maximum of 8 substitutions, so that's how many we 
provide.
(gdb) p idBuff
$7 = "37@xroo"

Alja

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