Import of kernel-4.18.0-553.64.1.el8_10

Makefile.rhelver

@@ -12,7 +12,7 @@ RHEL_MINOR = 10
 #
 # Use this spot to avoid future merge conflicts.
 # Do not trim this comment.
-RHEL_RELEASE = 553.63.1
+RHEL_RELEASE = 553.64.1
 
 #
 # ZSTREAM

drivers/net/wireless/intel/iwlwifi/iwl-drv.c

@@ -1139,7 +1139,7 @@ static int iwl_parse_tlv_firmware(struct iwl_drv *drv,
 
 			if (tlv_len != sizeof(*fseq_ver))
 				goto invalid_tlv_len;
-			IWL_INFO(drv, "TLV_FW_FSEQ_VERSION: %s\n",
+			IWL_INFO(drv, "TLV_FW_FSEQ_VERSION: %.32s\n",
 				 fseq_ver->version);
 			}
 			break;

drivers/tty/sysrq.c

@@ -283,7 +283,7 @@ static const struct sysrq_key_op sysrq_showregs_op = {
 static void sysrq_handle_showstate(int key)
 {
 	show_state();
-	show_workqueue_state();
+	show_all_workqueues();
 }
 static const struct sysrq_key_op sysrq_showstate_op = {
 	.handler	= sysrq_handle_showstate,

fs/nfs/pnfs.c

@@ -1919,9 +1919,11 @@ static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo)
 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo)
 {
 	if (atomic_dec_and_test(&lo->plh_outstanding) &&
-	    test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags))
+	    test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags)) {
+		smp_mb__after_atomic();
 		wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN);
 	}
+}
 
 static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo)
 {

include/linux/workqueue.h

@@ -486,7 +486,8 @@ extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
 extern unsigned int work_busy(struct work_struct *work);
 extern __printf(1, 2) void set_worker_desc(const char *fmt, ...);
 extern void print_worker_info(const char *log_lvl, struct task_struct *task);
-extern void show_workqueue_state(void);
+extern void show_all_workqueues(void);
+extern void show_one_workqueue(struct workqueue_struct *wq);
 extern void wq_worker_comm(char *buf, size_t size, struct task_struct *task);
 
 /**

kernel/power/process.c

@@ -96,7 +96,7 @@ static int try_to_freeze_tasks(bool user_only)
 		       todo - wq_busy, wq_busy);
 
 		if (wq_busy)
-			show_workqueue_state();
+			show_all_workqueues();
 
 		if (!wakeup) {
 			read_lock(&tasklist_lock);

kernel/sched/fair.c

@@ -3345,15 +3345,17 @@ static inline bool child_cfs_rq_on_list(struct cfs_rq *cfs_rq)
 {
 	struct cfs_rq *prev_cfs_rq;
 	struct list_head *prev;
+	struct rq *rq = rq_of(cfs_rq);
 
 	if (cfs_rq->on_list) {
 		prev = cfs_rq->leaf_cfs_rq_list.prev;
 	} else {
-		struct rq *rq = rq_of(cfs_rq);
-
 		prev = rq->tmp_alone_branch;
 	}
 
+	if (prev == &rq->leaf_cfs_rq_list)
+		return false;
+
 	prev_cfs_rq = container_of(prev, struct cfs_rq, leaf_cfs_rq_list);
 
 	return (prev_cfs_rq->tg->parent == cfs_rq->tg);

kernel/trace/ftrace.c

@@ -2833,6 +2833,16 @@ int ftrace_startup(struct ftrace_ops *ops, int command)
 
 	ftrace_startup_enable(command);
 
+	/*
+	 * If ftrace is in an undefined state, we just remove ops from list
+	 * to prevent the NULL pointer, instead of totally rolling it back and
+	 * free trampoline, because those actions could cause further damage.
+	 */
+	if (unlikely(ftrace_disabled)) {
+		__unregister_ftrace_function(ops);
+		return -ENODEV;
+	}
+
 	ops->flags &= ~FTRACE_OPS_FL_ADDING;
 
 	return 0;

kernel/workqueue.c

@@ -359,6 +359,7 @@ EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
 static int worker_thread(void *__worker);
 static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
 static void show_pwq(struct pool_workqueue *pwq);
+static void show_one_worker_pool(struct worker_pool *pool);
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/workqueue.h>
@@ -4553,7 +4554,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
 			raw_spin_unlock_irq(&pwq->pool->lock);
 			mutex_unlock(&wq->mutex);
 			mutex_unlock(&wq_pool_mutex);
-			show_workqueue_state();
+			show_one_workqueue(wq);
 			return;
 		}
 		raw_spin_unlock_irq(&pwq->pool->lock);
@@ -4816,22 +4817,53 @@ static void pr_cont_pool_info(struct worker_pool *pool)
 	pr_cont(" flags=0x%x nice=%d", pool->flags, pool->attrs->nice);
 }
 
-static void pr_cont_work(bool comma, struct work_struct *work)
+struct pr_cont_work_struct {
+	bool comma;
+	work_func_t func;
+	long ctr;
+};
+
+static void pr_cont_work_flush(bool comma, work_func_t func, struct pr_cont_work_struct *pcwsp)
+{
+	if (!pcwsp->ctr)
+		goto out_record;
+	if (func == pcwsp->func) {
+		pcwsp->ctr++;
+		return;
+	}
+	if (pcwsp->ctr == 1)
+		pr_cont("%s %ps", pcwsp->comma ? "," : "", pcwsp->func);
+	else
+		pr_cont("%s %ld*%ps", pcwsp->comma ? "," : "", pcwsp->ctr, pcwsp->func);
+	pcwsp->ctr = 0;
+out_record:
+	if ((long)func == -1L)
+		return;
+	pcwsp->comma = comma;
+	pcwsp->func = func;
+	pcwsp->ctr = 1;
+}
+
+static void pr_cont_work(bool comma, struct work_struct *work, struct pr_cont_work_struct *pcwsp)
 {
 	if (work->func == wq_barrier_func) {
 		struct wq_barrier *barr;
 
 		barr = container_of(work, struct wq_barrier, work);
 
+		pr_cont_work_flush(comma, (work_func_t)-1, pcwsp);
 		pr_cont("%s BAR(%d)", comma ? "," : "",
 			task_pid_nr(barr->task));
 	} else {
-		pr_cont("%s %ps", comma ? "," : "", work->func);
+		if (!comma)
+			pr_cont_work_flush(comma, (work_func_t)-1, pcwsp);
+		pr_cont_work_flush(comma, work->func, pcwsp);
 	}
 }
 
 static void show_pwq(struct pool_workqueue *pwq)
 {
+	struct pr_cont_work_struct pcws = { .ctr = 0, };
 	struct worker_pool *pool = pwq->pool;
 	struct work_struct *work;
 	struct worker *worker;
@@ -4864,7 +4896,8 @@ static void show_pwq(struct pool_workqueue *pwq)
 				worker->rescue_wq ? "(RESCUER)" : "",
 				worker->current_func);
 			list_for_each_entry(work, &worker->scheduled, entry)
-				pr_cont_work(false, work);
+				pr_cont_work(false, work, &pcws);
+			pr_cont_work_flush(comma, (work_func_t)-1L, &pcws);
 			comma = true;
 		}
 		pr_cont("\n");
@@ -4884,9 +4917,10 @@ static void show_pwq(struct pool_workqueue *pwq)
 			if (get_work_pwq(work) != pwq)
 				continue;
 
-			pr_cont_work(comma, work);
+			pr_cont_work(comma, work, &pcws);
 			comma = !(*work_data_bits(work) & WORK_STRUCT_LINKED);
 		}
+		pr_cont_work_flush(comma, (work_func_t)-1L, &pcws);
 		pr_cont("\n");
 	}
 
@@ -4895,33 +4929,23 @@ static void show_pwq(struct pool_workqueue *pwq)
 
 		pr_info("    inactive:");
 		list_for_each_entry(work, &pwq->inactive_works, entry) {
-			pr_cont_work(comma, work);
+			pr_cont_work(comma, work, &pcws);
 			comma = !(*work_data_bits(work) & WORK_STRUCT_LINKED);
 		}
+		pr_cont_work_flush(comma, (work_func_t)-1L, &pcws);
 		pr_cont("\n");
 	}
 }
 
 /**
- * show_workqueue_state - dump workqueue state
+ * show_one_workqueue - dump state of specified workqueue
- *
+ * @wq: workqueue whose state will be printed
- * Called from a sysrq handler or try_to_freeze_tasks() and prints out
- * all busy workqueues and pools.
  */
-void show_workqueue_state(void)
+void show_one_workqueue(struct workqueue_struct *wq)
 {
-	struct workqueue_struct *wq;
-	struct worker_pool *pool;
-	unsigned long flags;
-	int pi;
-
-	rcu_read_lock();
-
-	pr_info("Showing busy workqueues and worker pools:\n");
-
-	list_for_each_entry_rcu(wq, &workqueues, list) {
 	struct pool_workqueue *pwq;
 	bool idle = true;
+	unsigned long flags;
 
 	for_each_pwq(pwq, wq) {
 		if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
@@ -4929,33 +4953,59 @@ void show_workqueue_state(void)
 			break;
 		}
 	}
-		if (idle)
+	if (idle) /* Nothing to print for idle workqueue */
-			continue;
+		return;
 
 	pr_info("workqueue %s: flags=0x%x\n", wq->name, wq->flags);
 
 	for_each_pwq(pwq, wq) {
 		raw_spin_lock_irqsave(&pwq->pool->lock, flags);
-			if (pwq->nr_active || !list_empty(&pwq->inactive_works))
+		if (pwq->nr_active || !list_empty(&pwq->inactive_works)) {
+#ifndef	CONFIG_PREEMPT_RT
+			/*
+			 * Defer printing to avoid deadlocks in console
+			 * drivers that queue work while holding locks
+			 * also taken in their write paths.
+			 */
+			printk_deferred_enter();
 			show_pwq(pwq);
+			printk_deferred_exit();
+#else
+			show_pwq(pwq);
+#endif
+		}
 		raw_spin_unlock_irqrestore(&pwq->pool->lock, flags);
 		/*
 		 * We could be printing a lot from atomic context, e.g.
-			 * sysrq-t -> show_workqueue_state(). Avoid triggering
+		 * sysrq-t -> show_all_workqueues(). Avoid triggering
 		 * hard lockup.
 		 */
 		touch_nmi_watchdog();
 	}
+
 }
 
-	for_each_pool(pool, pi) {
+/**
+ * show_one_worker_pool - dump state of specified worker pool
+ * @pool: worker pool whose state will be printed
+ */
+static void show_one_worker_pool(struct worker_pool *pool)
+{
 	struct worker *worker;
 	bool first = true;
+	unsigned long flags;
 
 	raw_spin_lock_irqsave(&pool->lock, flags);
 	if (pool->nr_workers == pool->nr_idle)
 		goto next_pool;
-
+#ifndef	CONFIG_PREEMPT_RT
+	/*
+	 * Defer printing to avoid deadlocks in console drivers that
+	 * queue work while holding locks also taken in their write
+	 * paths.
+	 */
+	printk_deferred_enter();
+#endif
 	pr_info("pool %d:", pool->id);
 	pr_cont_pool_info(pool);
 	pr_cont(" hung=%us workers=%d",
@@ -4970,16 +5020,42 @@ void show_workqueue_state(void)
 		first = false;
 	}
 	pr_cont("\n");
+#ifndef	CONFIG_PREEMPT_RT
+	printk_deferred_exit();
+#endif
 next_pool:
 	raw_spin_unlock_irqrestore(&pool->lock, flags);
 	/*
 	 * We could be printing a lot from atomic context, e.g.
-		 * sysrq-t -> show_workqueue_state(). Avoid triggering
+	 * sysrq-t -> show_all_workqueues(). Avoid triggering
 	 * hard lockup.
 	 */
 	touch_nmi_watchdog();
+
 }
 
+/**
+ * show_all_workqueues - dump workqueue state
+ *
+ * Called from a sysrq handler or try_to_freeze_tasks() and prints out
+ * all busy workqueues and pools.
+ */
+void show_all_workqueues(void)
+{
+	struct workqueue_struct *wq;
+	struct worker_pool *pool;
+	int pi;
+
+	rcu_read_lock();
+
+	pr_info("Showing busy workqueues and worker pools:\n");
+
+	list_for_each_entry_rcu(wq, &workqueues, list)
+		show_one_workqueue(wq);
+
+	for_each_pool(pool, pi)
+		show_one_worker_pool(pool);
+
 	rcu_read_unlock();
 }
 
@@ -5935,7 +6011,7 @@ static void wq_watchdog_timer_fn(struct timer_list *unused)
 	rcu_read_unlock();
 
 	if (lockup_detected)
-		show_workqueue_state();
+		show_all_workqueues();
 
 	wq_watchdog_reset_touched();
 	mod_timer(&wq_watchdog_timer, jiffies + thresh);