SBUFTEST: loading DF-2552 harness module
SBUFTEST: sbuf created, s_size=4096, s_len=0, freespace=4095
SBUFTEST: trigger_len=2147487742, addlen will be (int)2147483647 = 2147483647
SBUFTEST: calling sbuf_bcopyin -> about to overflow kernel heap!
SBUFTEST: SURVIVED (unexpected M-bM^@M^T heap is corrupted, expect panic soon)
SBUFTEST: post-overflow s_size=4096 (should be 16)