From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: linux-next: boot problem with next-20120607 Date: Thu, 07 Jun 2012 16:20:22 -0600 Message-ID: <4FD12926.8050200@wwwdotorg.org> References: <20120607135320.7a1298385346bc238a0f92b0@canb.auug.org.au> <20120607150549.63f3ab81.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120607150549.63f3ab81.akpm@linux-foundation.org> Sender: linux-kernel-owner@vger.kernel.org To: Andrew Morton Cc: Stephen Rothwell , linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, Konstantin Khlebnikov , Oleg Nesterov List-Id: linux-next.vger.kernel.org On 06/07/2012 04:05 PM, Andrew Morton wrote: > On Thu, 7 Jun 2012 13:53:20 +1000 > Stephen Rothwell wrote: > >> Hi Andrew, >> >> My boot of next-20120607 in PowerPC produces lots of these warnings: >> >> BUG: Bad rss-counter state mm:c000000278508000 idx:0 val:-27 >> BUG: Bad rss-counter state mm:c000000278284000 idx:0 val:-27 >> BUG: Bad rss-counter state mm:c000000279e13000 idx:0 val:-27 >> BUG: Bad rss-counter state mm:c000000278285400 idx:0 val:-27 >> >> And so on (with different mm, idx and val numbers). Searching showed me >> commit "mm: correctly synchronize rss-counters at exit/exec" which seems >> to be there to fix this exact problem? > > Well that's a worry. Are you really sure > mm-correctly-synchronize-rss-counters-at-exit-exec.patch was applied at > the time? > > There's been an extended amount of inconclusive waffling on that patch, > but I thought it concerned the best way to fix it, rather than > *whether* it fixes it. I see those same errors on my ARM system. I found that reverting that patch (105d42c mm: correctly synchronize rss-counters at exit/exec) made them go away, although I didn't investigate whether that just removed some debug print or actually solved a problem.