We have a FreeIPA 4.1.4 domain running on CentOS 7.1.

We have noticed that from certain machines, sudo is instant, and from others, 
it takes about 5 seconds.

All machines involved can resolve each other through DNS (both forward and 
reverse lookups).

Running an strace reveals that sssd_pam is hanging for 4.3 seconds waiting for 
/proc/freeipaproccessid/fd3 which maps to [eventpoll]

0.000044 epoll_wait(3,  {{EPOLLIN, {u32=6976896, u64=6976896}}}, 1, 4896) = 1

4.373816 read(9, 
"l\2\1\1\206\0\0\0\10\0\0\0\25\0\0\0\5\1u\0\10\0\0\0\10\1g\0\7ua("..., 2048) = 

lrwx------ 1 root root 64 Feb  3 19:04 3 -> [eventpoll]

There are no nfs mounts on this system, so I can't see why this system call 
would take so long.

This is happening on 3 of our machines right now, but others can login just 
fine.  The pam/authconfig setup is identical on all of them.

Any ideas why sssd would be timing out trying to get [eventpoll] out of the 
/proc directory?
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