rcutorture: Dump stack when GP kthread stalls (b1adb3e2) · Commits · 戴 / test

This commit increases debug information in the case where the grace-period kthread is being prevented from running by dumping that kthread's stack. Signed-off-by:

Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Split into prior commit and this commit, as suggested by Josh Triplett. ] Reviewed-by:

Josh Triplett <josh@joshtriplett.org>

kernel/rcu/tree.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -1196,12 +1196,15 @@ static void rcu_check_gp_kthread_starvation(struct rcu_state *rsp)

		j = jiffies;
		gpa = READ_ONCE(rsp->gp_activity);
		if (j - gpa > 2 * HZ)
		if (j - gpa > 2 * HZ) {
		pr_err("%s kthread starved for %ld jiffies! g%lu c%lu f%#x s%d ->state=%#lx\n",
		rsp->name, j - gpa,
		rsp->gpnum, rsp->completed,
		rsp->gp_flags, rsp->gp_state,
		rsp->gp_kthread ? rsp->gp_kthread->state : ~0);
		if (rsp->gp_kthread)
		sched_show_task(rsp->gp_kthread);
		}
		}

		/*

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