linux-kernel - Re: RCU stall and the system boot hang

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Message-ID: <20151201195537.GA13568@linux.vnet.ibm.com>
Date:	Tue, 1 Dec 2015 11:55:37 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	fupan li <lifupan@...il.com>
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: RCU stall and the system boot hang

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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