Hi guys,
Thanks for reporting the problem!
It is rather suspicious that changing a semaphore to a condvar fixes the problem, after thinking about it, it occurred to me that we have a custom implementation of semaphores in xrootd because of:
https://sourceware.org/bugzilla/show_bug.cgi?id=12674
https://bugzilla.redhat.com/show_bug.cgi?id=1027348
now this problem has been fixed in glibc 2.21. Could you try to rebuild xrootd with a glibc 2.21 or newer and see if the problem persists?
There is a conditional compilation (https://github.com/xrootd/xrootd/blob/master/src/XrdCl/XrdClUglyHacks.hh#L32) and it will automatically use glibc semaphores.
Michal
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