Messages in this thread Patch in this message | | | Date | Thu, 17 Oct 2013 15:20:15 +0300 | Subject | Re: 3.12.0-rc5+ reproducible crash at kernel/timer.c:1117 | From | Janne Karhunen <> |
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On Tue, Oct 15, 2013 at 10:41 AM, Janne Karhunen <janne.karhunen@gmail.com> wrote:
>> call_timer_fn 0x73/0x160 <--- EIP hits 0 > > Use after free.. with CONFIG_DEBUG_PAGEALLOC && > CONFIG_DEBUG_OBJECTS_TIMERS we get : > > call_timer_fn 0x73/0x160 > destroy_timer_on_stack 0x20/0x20 > ftrace_raw_event_hrtimer_expire_entry 0x3b/0xc0 > run_timer_softirq 0x1f2/0x230
Sadly no time to hunt the free at the moment, so working around temporarily by
diff --git a/kernel/timer.c b/kernel/timer.c index 4296d13..fc7ef44 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -1094,6 +1094,9 @@ static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long), { int preempt_count = preempt_count();
+ if (fn == NULL) + return; +
Hoping someone wiser catches the real fix at some point.
-- Janne
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