rcu: Add diagnostics for offline CPUs failing to report QS

CPUs are expected to report quiescent states when coming online and
when going offline, and grace-period initialization is supposed to
handle any race conditions where a CPU's ->qsmask bit is set just after
it goes offline.  This commit adds diagnostics for the case where an
offline CPU nevertheless has a grace period waiting on it.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

2 files changed, 23 insertions, 0 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index ee218d743226..d3333ee2c6f5 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1188,6 +1188,27 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp)
                 smp_store_release(ruqp, true);
         }
 
+        /* If waiting too long on an offline CPU, complain. */
+        if (!(rdp->grpmask & rcu_rnp_online_cpus(rnp)) &&
+            time_after(jiffies, rdp->rsp->gp_start + HZ)) {
+                bool onl;
+                struct rcu_node *rnp1;
+
+                WARN_ON(1);  /* Offline CPUs are supposed to report QS! */
+                pr_info("%s: grp: %d-%d level: %d ->gp_seq %ld ->completedqs %ld\n",
+                        __func__, rnp->grplo, rnp->grphi, rnp->level,
+                        (long)rnp->gp_seq, (long)rnp->completedqs);
+                for (rnp1 = rnp; rnp1; rnp1 = rnp1->parent)
+                        pr_info("%s: %d:%d ->qsmask %#lx ->qsmaskinit %#lx ->qsmaskinitnext %#lx ->rcu_gp_init_mask %#lx\n",
+                                __func__, rnp1->grplo, rnp1->grphi, rnp1->qsmask, rnp1->qsmaskinit, rnp1->qsmaskinitnext, rnp1->rcu_gp_init_mask);
+                onl = !!(rdp->grpmask & rcu_rnp_online_cpus(rnp));
+                pr_info("%s %d: %c online: %ld(%d) offline: %ld(%d)\n",
+                        __func__, rdp->cpu, ".o"[onl],
+                        (long)rdp->rcu_onl_gp_seq, rdp->rcu_onl_gp_flags,
+                        (long)rdp->rcu_ofl_gp_seq, rdp->rcu_ofl_gp_flags);
+                return 1; /* Break things loose after complaining. */
+        }
+
         /*
          * A CPU running for an extended time within the kernel can
          * delay RCU grace periods.  When the CPU is in NO_HZ_FULL mode,
@@ -1967,6 +1988,7 @@ static bool rcu_gp_init(struct rcu_state *rsp)
                                             rnp->grphi, rnp->qsmask);
                 /* Quiescent states for tasks on any now-offline CPUs. */
                 mask = rnp->qsmask & ~rnp->qsmaskinitnext;
+                rnp->rcu_gp_init_mask = mask;
                 if ((mask || rnp->wait_blkd_tasks) && rcu_is_leaf_node(rnp))
                         rcu_report_qs_rnp(mask, rsp, rnp, rnp->gp_seq, flags);
                 else
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 8077aff7ab40..d51e6edc8e83 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -90,6 +90,7 @@ struct rcu_node {
                                 /*  an rcu_data structure, otherwise, each */
                                 /*  bit corresponds to a child rcu_node */
                                 /*  structure. */
+        unsigned long rcu_gp_init_mask; /* Mask of offline CPUs at GP init. */
         unsigned long qsmaskinit;
                                 /* Per-GP initial value for qsmask. */
                                 /*  Initialized from ->qsmaskinitnext at the */