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Commit b1adb3e2 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Dump stack when GP kthread stalls 



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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Split into prior commit and this commit, as suggested by
  Josh Triplett. ]
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent a0e3a3aa

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);

	}

}



/*