sizeof(struct sigaction) = 32
padding region: offset 28..31
marker = 0xaaaaaaaa (we memset the buffer with this before each call)
layout: [0..7]=sa_handler [8..11]=sa_flags [12..27]=sa_mask [28..31]=<padding>

sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)
sample: 00 00 00 00 00 00 00 00  00 00 00 00 ff fe fe ff  ff ff ff ff ff ff ff ff  ff ff ff ff | 00 00 00 00  (pad word 0x00000000)

samples with non-marker non-zero padding (leaked residue): 0/8
result: no residue observed (padding zero/defined)
RUN_EXIT=2