Hello, XRootD developers and users.


I have a problem to operate the XRootD storage.


We used some storage using NFS to store data. Then, our xrootd server's OS version is CentOS6,


IIn addition, an XRootD redirector, and the XRootD disk servers are XRootD4.


If I attempt to mount xrootdfs using the xrootd-fuse package(XRootD5), it seems to work very well at first.


However, scanning files with du commands, etc. will cause them to fail within minutes (probably within 10 minutes).


When I investigated the xrootdfs's process by attaching a strace command, we found that FUTEX was switching to WAIT and WAKE, and by the time it stopped, it was not WAKE, but only trying to run "epol" function.


Even if it does, the xrootd system is working normally using xrdfs command. 


Therefore, the issue is estimated to be a bug in xrootdfs, but no more detailed information could be detected.


Is there a better way to debug related issues?


Also, please check if there is a bug that locks futex if a lot of access occurs.


We guess that all subprocesses are locked before data is returned from the server.


I don't know the exact content because it's not a developer.


If you have any helpful information, please let me know that.



Geonmo Ryu / 류건모

Korea Institute of Science and Technology Information (KISTI)
Global Science experimental Data hub Center (GSDC)
245 Daehak-ro, Yuseong-gu, Daejeon, 305-806, Republic of Korea
Tel :  +82-42-869-1639
E-mail: (CMS Helpdesk) [log in to unmask] / (Contact) [log in to unmask]







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