linux-kernel - Re: Hard lockups under high CPU load with DynTicks

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Message-ID: <20141002200307.GW5015@linux.vnet.ibm.com>
Date:	Thu, 2 Oct 2014 13:03:07 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Lothian <mike@...eburn.co.uk>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Hard lockups under high CPU load with DynTicks - RCU Related?

On Tue, Sep 23, 2014 at 08:32:02AM +0100, Mike Lothian wrote:
> Hi
> 
> I've raised https://bugzilla.kernel.org/show_bug.cgi?id=84131 and
> attempted to bisect
> 
> The bug I'm stumbling on happens on both and Intel Sandybridge and AMD
> Kabini system - it manifests itself as a hard lockup when the system
> is under high load
> 
> If I switch off DynTicks the problem doesn't happen - I bisected by
> compiling Chromium marking each one good or bad if the system starts
> to lockup
> 
> I'm not sure if I've filed the bug under the right Product / Component
> 
> Please let me know if you'd like any more diagnostics

The commit that your bisection located is a merge commit.  Could you
please try each of the branches that were merged?  That might allow
you to pinpoint the actual commit.

							Thanx, Paul

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