linux-kernel - Re: [PATCH] time/tick-broadcast: Fix tick_broadcast

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Message-Id: <20190621133414.GF26519@linux.ibm.com>
Date:   Fri, 21 Jun 2019 06:34:14 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        frederic@...nel.org, tglx@...utronix.de
Subject: Re: [PATCH] time/tick-broadcast: Fix tick_broadcast_offline()
 lockdep complaint

On Fri, Jun 21, 2019 at 02:29:27PM +0200, Peter Zijlstra wrote:
> On Fri, Jun 21, 2019 at 05:16:30AM -0700, Paul E. McKenney wrote:
> > A pair of full hangs at boot (TASKS03 and TREE04), no console output
> > whatsoever.  Not sure how these changes could cause that, but suspicion
> > falls on sched_tick_offload_init().  Though even that is a bit strange
> > because if so, why didn't TREE01 and TREE07 also hang?  Again, looking
> > into it.
> 
> Pesky details ;-)

And backing out to the earlier patch removes the hangs, though statistical
insignificance and all that.

Ah, in answer to your earlier question, if you want it in v5.3, you
will need to take it (but I do humbly request that you wait until it
actually works).  If you don't take it, I won't be submitting it earlier
than v5.4.  Either way, your choice!

							Thanx, Paul