Ceph

In OSD.cc right now we set:

utime_t max = ceph_clock_now(g_ceph_context);
utime_t min = max;
min = g_conf>osd_scrub_min_interval;
max = g_conf>osd_scrub_max_interval;

and later do a check:

if (t > min) {
dout(10) << " " << pgid << " at " << t
<< " > min " << min << " (" << g_conf->osd_scrub_min_interval << " seconds ago)" << dendl;
break;
}

utime_t uses 32bit integer values for keeping track of seconds and nanoseconds, so doing a subtraction in this way with very large interval values (more than the current time) will cause the value to wrap and the test to fail.