1 files changed, 45 insertions, 0 deletions
diff --git a/debian/patches-rt/0035-rcu-Mark-emergency-section-in-rcu-stalls.patch b/debian/patches-rt/0035-rcu-Mark-emergency-section-in-rcu-stalls.patch
new file mode 100644
index 0000000000..3608cd7954
--- /dev/null
+++ b/debian/patches-rt/0035-rcu-Mark-emergency-section-in-rcu-stalls.patch
@@ -0,0 +1,45 @@
+From: John Ogness <john.ogness@linutronix.de>
+Date: Mon, 11 Sep 2023 15:53:39 +0000
+Subject: [PATCH 35/50] rcu: Mark emergency section in rcu stalls
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.7/older/patches-6.7-rt6.tar.xz
+
+Mark an emergency section within print_other_cpu_stall(), where
+RCU stall information is printed. In this section, the CPU will
+not perform console output for the printk() calls. Instead, a
+flushing of the console output will triggered when exiting the
+emergency section.
+
+Signed-off-by: John Ogness <john.ogness@linutronix.de>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ kernel/rcu/tree_stall.h |    5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/kernel/rcu/tree_stall.h
++++ b/kernel/rcu/tree_stall.h
+@@ -9,6 +9,7 @@
+ 
+ #include <linux/kvm_para.h>
+ #include <linux/rcu_notifier.h>
++#include <linux/console.h>
+ 
+ //////////////////////////////////////////////////////////////////////////////
+ //
+@@ -604,6 +605,8 @@ static void print_other_cpu_stall(unsign
+ 	if (rcu_stall_is_suppressed())
+ 		return;
+ 
++	nbcon_cpu_emergency_enter();
++
+ 	/*
+ 	 * OK, time to rat on our buddy...
+ 	 * See Documentation/RCU/stallwarn.rst for info on how to debug
+@@ -658,6 +661,8 @@ static void print_other_cpu_stall(unsign
+ 	panic_on_rcu_stall();
+ 
+ 	rcu_force_quiescent_state();  /* Kick them all. */
++
++	nbcon_cpu_emergency_exit();
+ }
+ 
+ static void print_cpu_stall(unsigned long gps)