-stable review patch. If anyone has any objections, please let us know. ------------------ From: Kirill Korotaev move_task_off_dead_cpu() requires interrupts to be disabled, while migrate_dead() calls it with enabled interrupts. Added appropriate comments to functions and added BUG_ON(!irqs_disabled()) into double_rq_lock() and double_lock_balance() which are the origin sources of such bugs. Signed-off-by: Kirill Korotaev Acked-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Chris Wright --- kernel/sched.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) --- linux-2.6.19.2.orig/kernel/sched.c +++ linux-2.6.19.2/kernel/sched.c @@ -1941,6 +1941,7 @@ static void double_rq_lock(struct rq *rq __acquires(rq1->lock) __acquires(rq2->lock) { + BUG_ON(!irqs_disabled()); if (rq1 == rq2) { spin_lock(&rq1->lock); __acquire(rq2->lock); /* Fake it out ;) */ @@ -1980,6 +1981,11 @@ static void double_lock_balance(struct r __acquires(busiest->lock) __acquires(this_rq->lock) { + if (unlikely(!irqs_disabled())) { + /* printk() doesn't work good under rq->lock */ + spin_unlock(&this_rq->lock); + BUG_ON(1); + } if (unlikely(!spin_trylock(&busiest->lock))) { if (busiest < this_rq) { spin_unlock(&this_rq->lock); @@ -5050,7 +5056,10 @@ wait_to_die: } #ifdef CONFIG_HOTPLUG_CPU -/* Figure out where task on dead CPU should go, use force if neccessary. */ +/* + * Figure out where task on dead CPU should go, use force if neccessary. + * NOTE: interrupts should be disabled by the caller + */ static void move_task_off_dead_cpu(int dead_cpu, struct task_struct *p) { unsigned long flags; @@ -5170,6 +5179,7 @@ void idle_task_exit(void) mmdrop(mm); } +/* called under rq->lock with disabled interrupts */ static void migrate_dead(unsigned int dead_cpu, struct task_struct *p) { struct rq *rq = cpu_rq(dead_cpu); @@ -5186,10 +5196,11 @@ static void migrate_dead(unsigned int de * Drop lock around migration; if someone else moves it, * that's OK. No task can be added to this CPU, so iteration is * fine. + * NOTE: interrupts should be left disabled --dev@ */ - spin_unlock_irq(&rq->lock); + spin_unlock(&rq->lock); move_task_off_dead_cpu(dead_cpu, p); - spin_lock_irq(&rq->lock); + spin_lock(&rq->lock); put_task_struct(p); } -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/