12.08.2013, 20:41, "Sebastian Andrzej Siewior" <bigeasy@xxxxxxxxxxxxx>:
> * Alexander Fyodorov | 2013-07-24 20:23:27 [+0400]:
> Hi Alexander,
Hi Sebastian,
>> I ran into a race on 2.6.33-rt kernel which I think still exists in the latest RT patches. The following patch fixes it but it may be incomplete: probably spinlock should be taken in all other places that check saved_state too. I only compile-tested this patch for 3.6-rt.
>
> It looks interresting, thanks for the report. Do you have maybe a
> test-case which can provoke the bug?
I can't publish the test but essentially it was doing the following: one process (application) has 20 threads sending signals to each other (creating contention for tasklist_lock and profiling events), and another one (profiler) attaches to the application and then does:
for (;;) {
pid = wait();
ptrace(PTRACE_CONT, pid);
}
Is there a need to write a test?
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