Showing error 1147

User: Jiri Slaby
Error type: Double Lock
Error type description: Some lock is locked twice unintentionally in a sequence
File location: kernel/sched.c
Line in file: 3543
Project: Linux Kernel
Project version: 2.6.28
Tools: Stanse (1.2)
Entered: 2012-04-29 14:49:11 UTC

Source: 

3513                 * correctly treated as an imbalance.
3514                 */
3515                local_irq_save(flags);
3516                double_rq_lock(this_rq, busiest);
3517                ld_moved = move_tasks(this_rq, this_cpu, busiest,
3518                                      imbalance, sd, idle, &all_pinned);
3519                double_rq_unlock(this_rq, busiest);
3520                local_irq_restore(flags);
3521
3522                /*
3523                 * some other cpu did the load balance for us.
3524                 */
3525                if (ld_moved && this_cpu != smp_processor_id())
3526                        resched_cpu(this_cpu);
3527
3528                /* All tasks on this runqueue were pinned by CPU affinity */
3529                if (unlikely(all_pinned)) {
3530                        cpu_clear(cpu_of(busiest), *cpus);
3531                        if (!cpus_empty(*cpus))
3532                                goto redo;
3533                        goto out_balanced;
3534                }
3535        }
3536
3537        if (!ld_moved) {
3538                schedstat_inc(sd, lb_failed[idle]);
3539                sd->nr_balance_failed++;
3540
3541                if (unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2)) {
3542
3543                        spin_lock_irqsave(&busiest->lock, flags);
3544
3545                        /* don't kick the migration_thread, if the curr
3546                         * task on busiest cpu can't be moved to this_cpu
3547                         */
3548                        if (!cpu_isset(this_cpu, busiest->curr->cpus_allowed)) {
3549                                spin_unlock_irqrestore(&busiest->lock, flags);
3550                                all_pinned = 1;
3551                                goto out_one_pinned;
3552                        }
3553
Show full sources
↑