1 files changed, 43 insertions, 0 deletions
diff --git a/debian/patches-rt/0300-sched-migrate-disable-Protect-cpus_ptr-with-lock.patch b/debian/patches-rt/0300-sched-migrate-disable-Protect-cpus_ptr-with-lock.patch
new file mode 100644
index 000000000..98a2369c2
--- /dev/null
+++ b/debian/patches-rt/0300-sched-migrate-disable-Protect-cpus_ptr-with-lock.patch
@@ -0,0 +1,43 @@
+From: Scott Wood <swood@redhat.com>
+Date: Sat, 27 Jul 2019 00:56:34 -0500
+Subject: [PATCH 300/342] sched: migrate disable: Protect cpus_ptr with lock
+Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=51a9977c0b69716f9a2ca78d92686b134d5fe5e3
+
+[ Upstream commit 27ee52a891ed2c7e2e2c8332ccae0de7c2674b09 ]
+
+Various places assume that cpus_ptr is protected by rq/pi locks,
+so don't change it before grabbing those locks.
+
+Signed-off-by: Scott Wood <swood@redhat.com>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
+---
+ kernel/sched/core.c | 6 ++----
+ 1 file changed, 2 insertions(+), 4 deletions(-)
+
+diff --git a/kernel/sched/core.c b/kernel/sched/core.c
+index e64d2b2b3a69..6f91ee2b7e91 100644
+--- a/kernel/sched/core.c
++++ b/kernel/sched/core.c
+@@ -7244,9 +7244,8 @@ migrate_disable_update_cpus_allowed(struct task_struct *p)
+ 	struct rq *rq;
+ 	struct rq_flags rf;
+ 
+-	p->cpus_ptr = cpumask_of(smp_processor_id());
+-
+ 	rq = task_rq_lock(p, &rf);
++	p->cpus_ptr = cpumask_of(smp_processor_id());
+ 	update_nr_migratory(p, -1);
+ 	p->nr_cpus_allowed = 1;
+ 	task_rq_unlock(rq, p, &rf);
+@@ -7258,9 +7257,8 @@ migrate_enable_update_cpus_allowed(struct task_struct *p)
+ 	struct rq *rq;
+ 	struct rq_flags rf;
+ 
+-	p->cpus_ptr = &p->cpus_mask;
+-
+ 	rq = task_rq_lock(p, &rf);
++	p->cpus_ptr = &p->cpus_mask;
+ 	p->nr_cpus_allowed = cpumask_weight(&p->cpus_mask);
+ 	update_nr_migratory(p, 1);
+ 	task_rq_unlock(rq, p, &rf);