Author: mjg
Date: Thu Jan 30 19:38:51 2020
New Revision: 357308
URL: https://svnweb.freebsd.org/changeset/base/357308
Log:
Assert that smp_rendezvous_cpus is called with interrupts enabled.
Modified:
head/sys/kern/subr_smp.c
Modified: head/sys/kern/subr_smp.c
==============================================================================
--- head/sys/kern/subr_smp.c Thu Jan 30 19:38:12 2020 (r357307)
+++ head/sys/kern/subr_smp.c Thu Jan 30 19:38:51 2020 (r357308)
@@ -563,6 +563,12 @@ smp_rendezvous_cpus(cpuset_t map,
return;
}
+ /*
+ * Make sure we come here with interrupts enabled. Otherwise we
+ * livelock if smp_ipi_mtx is owned by a thread which sent as an IPI.
+ */
+ MPASS(curthread->td_md.md_spinlock_count == 0);
+
CPU_FOREACH(i) {
if (CPU_ISSET(i, &map))
ncpus++;
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