Re: RCU stall and the system boot hang

From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: RCU stall and the system boot hang
Date	2015-12-01 21:00 +0100
Message-ID	<qAZfI-5yU-9@gated-at.bofh.it> (permalink)
References	(3 earlier) <qzP8J-1HY-3@gated-at.bofh.it> <qA3ln-2zf-7@gated-at.bofh.it> <qA3ln-2zf-5@gated-at.bofh.it> <qAAhk-6vu-15@gated-at.bofh.it> <qAAhk-6vu-13@gated-at.bofh.it>
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On Mon, Nov 30, 2015 at 09:19:18AM -0800, Paul E. McKenney wrote:
> On Mon, Nov 30, 2015 at 02:54:13PM +0800, fupan li wrote:

[ . . . ]

> > No,  just a normal boot, and these stalls were happened before
> > systemd services running.
>
> Interesting.  My testing show v4.1 being OK, with the first issues showing
> up somewhere between v4.1 and v4.2.  Or at least v4.1 is reliable enough
> that is passes 42 hours of focused rcutorture testing, where v4.2 tends
> to fail in under two hours.  And it seems to happen only on multisocket
> systems -- I seem to be able to hammer as hard as I want on my four-core
> (eight hardware thread) laptop without an issue.

And I take it back.  After beating on it for the better part of a week,
I did get one failure on my single-socket laptop.

So maybe I need to make my rcutorture scripts force tests to cross socket
boundaries where possible...

							Thanx, Paul

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Re: RCU stall and the system boot hang "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-11-30 18:20 +0100
  Re: RCU stall and the system boot hang "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-01 21:00 +0100

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