On Fri, May 08, 2015 at 01:58:46PM -0400, Chris Metcalf wrote:
quoted hunk ↗ jump to hunk
+++ b/kernel/time/tick-sched.c
@@ -436,6 +436,20 @@ static void dataplane_quiesce(void)
(jiffies - start));
dump_stack();
}
+
+ /*
+ * Kill the process if it violates STRICT mode. Note that this
+ * code also results in killing the task if a kernel bug causes an
+ * irq to be delivered to this core.
+ */
+ if ((task->dataplane_flags & (PR_DATAPLANE_STRICT|PR_DATAPLANE_PRCTL))
+ == PR_DATAPLANE_STRICT) {
+ pr_warn("Dataplane STRICT mode violated; process killed.\n");
+ dump_stack();
+ task->dataplane_flags &= ~PR_DATAPLANE_QUIESCE;
+ local_irq_enable();
+ do_group_exit(SIGKILL);
+ }
}
So while I'm all for hard fails like this, can we not provide a wee bit
more information in the siginfo ? And maybe use a slightly less fatal
signal, such that userspace can actually catch it and dump state in
debug modes?