4.9.65-rt57-rc2 stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> hrtimers, which were deferred to the softirq context, and expire between softirq shutdown and hrtimer migration are dangling around. If the CPU goes back up the list head will be initialized and this corrupts the timer's list. It will remain unnoticed until a hrtimer_cancel(). This moves those timers so they will expire. Cc: stable-rt@xxxxxxxxxxxxxxx Reported-by: Mike Galbraith <efault@xxxxxx> Tested-by: Mike Galbraith <efault@xxxxxx> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> --- kernel/time/hrtimer.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 0797bd6eadb4..39e4435b8451 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1860,6 +1860,11 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base, */ enqueue_hrtimer(timer, new_base); } +#ifdef CONFIG_PREEMPT_RT_BASE + list_splice_tail(&old_base->expired, &new_base->expired); + if (!list_empty(&new_base->expired)) + raise_softirq_irqoff(HRTIMER_SOFTIRQ); +#endif } int hrtimers_dead_cpu(unsigned int scpu) -- 2.13.2 -- To unsubscribe from this list: send the line "unsubscribe stable-rt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
