diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/workqueue.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index fb1eb7a3f49b..044b4eee760b 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -49,6 +49,7 @@ #include <linux/moduleparam.h> #include <linux/uaccess.h> #include <linux/sched/isolation.h> +#include <linux/sched/debug.h> #include <linux/nmi.h> #include <linux/kvm_para.h> @@ -141,6 +142,8 @@ enum { * WR: wq->mutex protected for writes. RCU protected for reads. * * MD: wq_mayday_lock protected. + * + * WD: Used internally by the watchdog. */ /* struct worker is defined in workqueue_internal.h */ @@ -153,6 +156,7 @@ struct worker_pool { unsigned int flags; /* X: flags */ unsigned long watchdog_ts; /* L: watchdog timestamp */ + bool cpu_stall; /* WD: stalled cpu bound pool */ /* * The counter is incremented in a process context on the associated CPU @@ -5976,6 +5980,57 @@ static struct timer_list wq_watchdog_timer; static unsigned long wq_watchdog_touched = INITIAL_JIFFIES; static DEFINE_PER_CPU(unsigned long, wq_watchdog_touched_cpu) = INITIAL_JIFFIES; +/* + * Show workers that might prevent the processing of pending work items. + * The only candidates are CPU-bound workers in the running state. + * Pending work items should be handled by another idle worker + * in all other situations. + */ +static void show_cpu_pool_hog(struct worker_pool *pool) +{ + struct worker *worker; + unsigned long flags; + int bkt; + + raw_spin_lock_irqsave(&pool->lock, flags); + + hash_for_each(pool->busy_hash, bkt, worker, hentry) { + if (task_is_running(worker->task)) { + /* + * Defer printing to avoid deadlocks in console + * drivers that queue work while holding locks + * also taken in their write paths. + */ + printk_deferred_enter(); + + pr_info("pool %d:\n", pool->id); + sched_show_task(worker->task); + + printk_deferred_exit(); + } + } + + raw_spin_unlock_irqrestore(&pool->lock, flags); +} + +static void show_cpu_pools_hogs(void) +{ + struct worker_pool *pool; + int pi; + + pr_info("Showing backtraces of running workers in stalled CPU-bound worker pools:\n"); + + rcu_read_lock(); + + for_each_pool(pool, pi) { + if (pool->cpu_stall) + show_cpu_pool_hog(pool); + + } + + rcu_read_unlock(); +} + static void wq_watchdog_reset_touched(void) { int cpu; @@ -5989,6 +6044,7 @@ static void wq_watchdog_timer_fn(struct timer_list *unused) { unsigned long thresh = READ_ONCE(wq_watchdog_thresh) * HZ; bool lockup_detected = false; + bool cpu_pool_stall = false; unsigned long now = jiffies; struct worker_pool *pool; int pi; @@ -6001,6 +6057,7 @@ static void wq_watchdog_timer_fn(struct timer_list *unused) for_each_pool(pool, pi) { unsigned long pool_ts, touched, ts; + pool->cpu_stall = false; if (list_empty(&pool->worklist)) continue; @@ -6025,11 +6082,17 @@ static void wq_watchdog_timer_fn(struct timer_list *unused) /* did we stall? */ if (time_after(now, ts + thresh)) { lockup_detected = true; + if (pool->cpu >= 0) { + pool->cpu_stall = true; + cpu_pool_stall = true; + } pr_emerg("BUG: workqueue lockup - pool"); pr_cont_pool_info(pool); pr_cont(" stuck for %us!\n", jiffies_to_msecs(now - pool_ts) / 1000); } + + } rcu_read_unlock(); @@ -6037,6 +6100,9 @@ static void wq_watchdog_timer_fn(struct timer_list *unused) if (lockup_detected) show_all_workqueues(); + if (cpu_pool_stall) + show_cpu_pools_hogs(); + wq_watchdog_reset_touched(); mod_timer(&wq_watchdog_timer, jiffies + thresh); } |