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Date:   Tue, 10 Aug 2021 19:30:40 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,,,,
        Thomas Gleixner <>,
        Sebastian Andrzej Siewior <>
Subject: [PATCH 5.13 132/175] timers: Move clearing of base::timer_running under base:: Lock

From: Thomas Gleixner <>

commit bb7262b295472eb6858b5c49893954794027cd84 upstream.

syzbot reported KCSAN data races vs. timer_base::timer_running being set to
NULL without holding base::lock in expire_timers().

This looks innocent and most reads are clearly not problematic, but
Frederic identified an issue which is:

 int data = 0;

 void timer_func(struct timer_list *t)
    data = 1;

 CPU 0                                            CPU 1
 ------------------------------                   --------------------------
 base = lock_timer_base(timer, &flags);           raw_spin_unlock(&base->lock);
 if (base->running_timer != timer)                call_timer_fn(timer, fn, baseclk);
   ret = detach_if_pending(timer, base, true);    base->running_timer = NULL;
 raw_spin_unlock_irqrestore(&base->lock, flags);  raw_spin_lock(&base->lock);

 x = data;

If the timer has previously executed on CPU 1 and then CPU 0 can observe
base->running_timer == NULL and returns, assuming the timer has completed,
but it's not guaranteed on all architectures. The comment for
del_timer_sync() makes that guarantee. Moving the assignment under
base->lock prevents this.

For non-RT kernel it's performance wise completely irrelevant whether the
store happens before or after taking the lock. For an RT kernel moving the
store under the lock requires an extra unlock/lock pair in the case that
there is a waiter for the timer, but that's not the end of the world.

Fixes: 030dcdd197d7 ("timers: Prepare support for PREEMPT_RT")
Signed-off-by: Thomas Gleixner <>
Tested-by: Sebastian Andrzej Siewior <>
Signed-off-by: Greg Kroah-Hartman <>
 kernel/time/timer.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1279,8 +1279,10 @@ static inline void timer_base_unlock_exp
 static void timer_sync_wait_running(struct timer_base *base)
 	if (atomic_read(&base->timer_waiters)) {
+		raw_spin_unlock_irq(&base->lock);
+		raw_spin_lock_irq(&base->lock);
@@ -1471,14 +1473,14 @@ static void expire_timers(struct timer_b
 		if (timer->flags & TIMER_IRQSAFE) {
 			call_timer_fn(timer, fn, baseclk);
-			base->running_timer = NULL;
+			base->running_timer = NULL;
 		} else {
 			call_timer_fn(timer, fn, baseclk);
+			raw_spin_lock_irq(&base->lock);
 			base->running_timer = NULL;
-			raw_spin_lock_irq(&base->lock);

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