Customers running Linux GLIBC versions prior to 2.12 may be subject to a GLIBC bug (bug 3270) which can cause GsFile operations calling the OS seteuid( ) operation to deadlock. Using pstack to view the stack of the hanging gem, if you see these entries then you may have hit this bug:
__nptl_setxid () from /lib64/libpthread.so.0
seteuid () from /lib64/libc.so.6
The following web pages have further discussion on this issue:
https://sourceware.org/bugzilla/show_bug.cgi?id=3270
https://sourceforge.net/p/gfarm/tickets/84/
https://github.com/xrootd/xrootd/issues/60
Upgrade your Linux machine to use a newer version of GLIBC. You should upgrade to version 2.12 or later.
Last updated: 5/18/16