Re: sched: circular dependency between sched_domains_mutex andoom_notify_list

[Ingo Molnar]

* Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:

> I suspect it's the result of adding the new rcu_oom_notify, but that happened
> about half a year ago so I'm not sure why this showed up only now.
> 
> [ 1039.634183] ======================================================
> [ 1039.635717] [ INFO: possible circular locking dependency detected ]
> [ 1039.637255] 3.8.0-rc7-next-20130215-sasha-00003-gea816fa #286 Tainted: G        W
> [ 1039.639104] -------------------------------------------------------
> [ 1039.640579] init/1 is trying to acquire lock:
> [ 1039.641224]  ((oom_notify_list).rwsem){.+.+..}, at: [<ffffffff81141c8f>] __blocking_notifier_call_chain+0x7f/0xc0

We changed (optimized) rwsems via:

 3a15e0e0cdda rwsem: Implement writer lock-stealing for better scalability

so maybe it can hit different codepaths and races now?

Thanks,

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/