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Created attachment 946426 [details]
output from `strace -e trace=file irqbalance --debug --oneshot`

Description of problem:

If irqbalance doesn't have right to change irq smp affinity it will silliently continue without any warning in logs what so ever.

How reproducible:

Run irqbalance with 

Steps to Reproduce:
1. log yourself as regular user
2. set IRQBALANCE_BANNED_CPUS
3. run irqbalancer
4. check /proc/irq/*/smp_affinity if was changed by irqbalance to value coresponding with IRQBALANCE_BANNED_CPUS (if you've done everything right value should stay unchanged due lack of privileges)
5. check irqbalance log (you'll see nothing about failing to set SMP affinity)

Expected results:

I belive I should be able to at least see some warning in logs about failing to set SMP affinity

Additional info:
In attachment I'm sending output from my run of `strace -e trace=file irqbalance --debug --oneshot`

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1279.html