FYI, we noticed the below changes on https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git vhost commit 6c864258bdfb50aacf0ac1147989f76772070c2a ("x86: faster smp_store_mb") As below, the "usemem" should be run for 72 times, but test is terminated with SIGTERM after 50 times. 2016-01-03 19:45:31 mount -t tmpfs -o size=100% vm-scalability-tmp /tmp/vm-scalability-tmp 2016-01-03 19:45:31 truncate -s 135083753472 /tmp/vm-scalability-tmp/vm-scalability.img 2016-01-03 19:45:31 mkfs.xfs -q /tmp/vm-scalability-tmp/vm-scalability.img 2016-01-03 19:45:31 mount -o loop /tmp/vm-scalability-tmp/vm-scalability.img /tmp/vm-scalability-tmp/vm-scalability repeat count: 1 2016-01-03 19:45:31 ./case-shm-pread-seq 2016-01-03 19:45:31 truncate /tmp/vm-scalability-tmp/sparse-shm-pread-seq -s 135083753472 2016-01-03 19:45:31 ./usemem --runtime 300 -n 72 -f /tmp/vm-scalability-tmp/sparse-shm-pread-seq --readonly 67541876736 75984611328 bytes / 120353120 usecs = 616550 KB/s 75984611328 bytes / 120353167 usecs = 616549 KB/s 75984611328 bytes / 120353136 usecs = 616549 KB/s 75984611328 bytes / 120353194 usecs = 616549 KB/s 75984611328 bytes / 120353198 usecs = 616549 KB/s 75984611328 bytes / 120353138 usecs = 616549 KB/s 75984611328 bytes / 120353214 usecs = 616549 KB/s 75984611328 bytes / 120353207 usecs = 616549 KB/s 75984611328 bytes / 120353220 usecs = 616549 KB/s 75984611328 bytes / 120353202 usecs = 616549 KB/s 75984611328 bytes / 120353213 usecs = 616549 KB/s 75984611328 bytes / 120353139 usecs = 616549 KB/s 75984611328 bytes / 120353193 usecs = 616549 KB/s 75984611328 bytes / 120353211 usecs = 616549 KB/s 75984611328 bytes / 120353214 usecs = 616549 KB/s 75984611328 bytes / 120353217 usecs = 616549 KB/s 75984611328 bytes / 120353213 usecs = 616549 KB/s 75984611328 bytes / 120353224 usecs = 616549 KB/s 75984611328 bytes / 120353202 usecs = 616549 KB/s 75984611328 bytes / 120353202 usecs = 616549 KB/s 75984611328 bytes / 120353210 usecs = 616549 KB/s 75984611328 bytes / 120353204 usecs = 616549 KB/s 75984611328 bytes / 120353214 usecs = 616549 KB/s 75984611328 bytes / 120353200 usecs = 616549 KB/s 75984611328 bytes / 120353203 usecs = 616549 KB/s 75984611328 bytes / 120353197 usecs = 616549 KB/s 75984611328 bytes / 120353198 usecs = 616549 KB/s 75984611328 bytes / 120353190 usecs = 616549 KB/s 75984611328 bytes / 120353208 usecs = 616549 KB/s 75984611328 bytes / 120353216 usecs = 616549 KB/s 75984611328 bytes / 120353187 usecs = 616549 KB/s 75984611328 bytes / 120353190 usecs = 616549 KB/s 75984611328 bytes / 120353201 usecs = 616549 KB/s 75984611328 bytes / 120353217 usecs = 616549 KB/s 75984611328 bytes / 120353202 usecs = 616549 KB/s 75984611328 bytes / 120353200 usecs = 616549 KB/s 75984611328 bytes / 120353199 usecs = 616549 KB/s 75984611328 bytes / 120353205 usecs = 616549 KB/s 75984611328 bytes / 120353217 usecs = 616549 KB/s 75984611328 bytes / 120353196 usecs = 616549 KB/s 75984611328 bytes / 120353201 usecs = 616549 KB/s 75984611328 bytes / 120353199 usecs = 616549 KB/s 75984611328 bytes / 120353155 usecs = 616549 KB/s 75984611328 bytes / 120353211 usecs = 616549 KB/s 75984611328 bytes / 120353184 usecs = 616549 KB/s 75984611328 bytes / 120353197 usecs = 616549 KB/s 75984611328 bytes / 120353196 usecs = 616549 KB/s 75984611328 bytes / 120353215 usecs = 616549 KB/s 75984611328 bytes / 120353143 usecs = 616549 KB/s 75984611328 bytes / 120353152 usecs = 616549 KB/s Terminated To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Ying Huang