Re: [PATCH] fix __mod_timer vs __run_timers deadlock.

Lee Revell
2005-05-03T01:24:20Z

On Tue, 2005-05-03 at 10:13 +1000, Benjamin Herrenschmidt wrote:
> Well, there may be other issues brought by this new timer code though.
> I'm running G5s regulary without a lockup or anything for weeks, so it
> would be interesting if you could try to find out what's involved in
> that other lockup you had.

It seems like it would not be to hard to create a timer test suite that
just hammers the timer subsystem, creating and deleting and modifying
zillions of timers, changing the system time, etc. Combined with
running with HZ=10000 or something it seems like you could shake out
bugs a lot faster than just running & waiting for a race to show up.

I've seen timer related issues (the set_rtc_mmss issue that George
Anzinger fixed) while testing the RT patchset that I could only ever
reproduce once.

Lee