[PATCH 06/48] rcutorture: Dump GP kthread state on insufficient cb-flood laundering

[Uladzislau Rezki (Sony)]

From: "Paul E. McKenney" <paulmck@xxxxxxxxxx>

If a callback flood prevents grace period from completing, rcutorture
does a WARN_ON().  Avoiding this WARN_ON() currently requires that at
least three grace periods elapse during an eight-second callback-flood
interval.  Unfortunately, the current debug information does not include
anything about the grace-period state.  This commit therefore adds a
call to cur_ops->gp_kthread_dbg(), if this function pointer is non-NULL.

Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
---
 kernel/rcu/rcutorture.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 6611ef3e71c3..eff51a26216f 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2832,7 +2832,8 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp)
 
 	if (!torture_must_stop() && !READ_ONCE(rcu_fwd_emergency_stop) &&
 	    !shutdown_time_arrived()) {
-		WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED);
+		if (WARN_ON(n_max_gps < MIN_FWD_CBS_LAUNDERED) && cur_ops->gp_kthread_dbg)
+			cur_ops->gp_kthread_dbg();
 		pr_alert("%s Duration %lu barrier: %lu pending %ld n_launders: %ld n_launders_sa: %ld n_max_gps: %ld n_max_cbs: %ld cver %ld gps %ld #online %u\n",
 			 __func__,
 			 stoppedat - rfp->rcu_fwd_startat, jiffies - stoppedat,
-- 
2.39.2