lparstat segfault if 'SPU' line in /proc/interrupts is too long

Issue

• lparstat segfault if SPU line in /proc/interrupts is too long (> 512 char).

# cat proc/interrupts  | grep SPU
SPU:     174977      12058      12063  <........>    12070   Spurious interrupts

# cat proc/interrupts  | grep SPU | wc -c
907

• After system boot up, segfault occurs from lparstat.

Aug  1 00:00:03 kgbossmdb3 kernel: lparstat[8162]: unhandled signal 11 at 00003ffff81a0008 nip 0000000010001e78 lr 0000000010001e74 code 30001