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Date: Fri, 26 Jun 2015 23:49:10 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Gavin Guo <gavin.guo@canonical.com>, Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: commit 4066c33d0308f8 breaks booting under KVM
Message-ID: <20150627034910.GB474@thunk.org>
Mail-Followup-To: Theodore Ts'o <tytso@mit.edu>,
	Gavin Guo <gavin.guo@canonical.com>,
	Christoph Lameter <cl@linux.com>, Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org
References: <20150626142332.GA28413@thunk.org>
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On Fri, Jun 26, 2015 at 10:23:32AM -0400, Theodore Ts'o wrote:
> I can no longer boot Linus's tree under KVM using a 32-bit i386 build;
> it just hangs before any messages get sent to the serial console.  It
> bisects down to:
> 
> commit 4066c33d0308f87e9a3b0c7fafb9141c0bfbfa77
> Author: Gavin Guo <gavin.guo@canonical.com>
> Date:   Wed Jun 24 16:55:54 2015 -0700
>
>     mm/slab_common: support the slub_debug boot option on specific object size
> ...    


As a follow up, this commit breaks 32-bit and 64-bit x86 if you have
CONFIG_SLAB enabled.  When I switched to CONFIG_SLUB, the kernel
boots.  So it appears this commit is breaking kernel configurations
with CONFIG_SLAB enabled.

	    	      	     	      	 	      - Ted
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