2013/4/12 Tommi Rantala <[email protected]>:
> 2013/4/12 Peter Zijlstra <[email protected]>:
>> perf_swevent_init() only sets event->destroy() (to
>> sw_perf_event_destroy) _after_ it increments the static key thing and
>> enqueues (and allocates) the hash list stuff.
>>
>> Obviously something is funny, but I'm not seeing it.
>
> Might this help... ? (untested)
I can reproduce the bug on my machine with:
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/perf_event.h>
int main(void)
{
struct perf_event_attr attr = {
.type = PERF_TYPE_SOFTWARE,
.size = sizeof(struct perf_event_attr),
.config = 0x00000000ffffffff,
};
syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
return 0;
}
The patch below fixes the oops. I'll send it properly.
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 59412d0..fff6420 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -5330,7 +5330,7 @@ static void sw_perf_event_destroy(struct
> perf_event *event)
>
> static int perf_swevent_init(struct perf_event *event)
> {
> - int event_id = event->attr.config;
> + u64 event_id = event->attr.config;
>
> if (event->attr.type != PERF_TYPE_SOFTWARE)
> return -ENOENT;
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