From: Paul E. McKenney Date: Sun, 18 Feb 2024 17:11:08 +0000 (-0800) Subject: rcutorture: Dump GP kthread state on insufficient cb-flood laundering X-Git-Tag: v6.10-rc1~234^2^5~11 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f8039457eedc378fa7a186054ee3032b8a41eaee;p=thirdparty%2Fkernel%2Flinux.git rcutorture: Dump GP kthread state on insufficient cb-flood laundering 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 Signed-off-by: Uladzislau Rezki (Sony) --- diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 6611ef3e71c33..eff51a26216f3 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,