To shim strace into service startup so it gets started with correct permissions and environment:
service irq_balancer /system/bin/strace -o /data/local/tmp/msm_irqb.strace /odm/bin/irq_balancer -f /vendor/etc/irq_balancer.conf socket irq_balancer seqpacket 0660 root root user root group root disabled
/system as read-write, then:
chcon u:object_r:irq_balancer_exec:s0 /system/bin/strace
For more information, see the article on strace at Android source.