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I have some new input concerning this : it can be reproduced without xrootd being even restarted, as is proven on this machine (lxbre43a05) :

ls -alrt /var/log/xrootd/ | grep log

prw-------. 1 root root 0 Mar 10 2015 .xrootd.log
-rw-r--r--. 1 root root 1325 Mar 12 2015 xrootd.log.1
-rw-r--r--. 1 root root 5 Jan 22 03:37 .*.log

ps auxf | grep xroo[t]

stage 198202 0.0 0.0 579880 15956 ? Sl 2015 0:16 /usr/bin/xrootd -l /var/log/xrootd/xrootd.log -c /etc/xrd.cf.server -k fifo -b -s /var/run/xrootd/xrootd-server.pid -n server

After some digging with Michal, we've found out 3 issues :

• a bug in logrotate by which the given regexp is considered for log rotation if no expansion of it is existing, this explains why *.log is considered when no .log file exists. Not fixed to my knowledge
• a bug in logrotate (https://fedorahosted.org/logrotate/ticket/8) by which the postrotate script is called for files not rotated. So now we call the postrotate for *.log. This has been fixed (https://fedorahosted.org/logrotate/changeset/403) and is available in logrotate 3.8.4. So CC7 is immune and slc6 should probably upgrade from 3.7.8, that is 7 years old !?!?!
• a bug in the postrotate of xrootd by which the file name is expanded in the -p check while it should not be. So double quotes need to be added.

Last one can be easily done and fixes all issues.

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