Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 10 Sep 2019 12:32:44 +0100
From:   Mike Rapoport <rppt@kernel.org>
To:     Thomas Bogendoerfer <tbogendoerfer@suse.de>
Cc:     Paul Burton <paul.burton@mips.com>, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org, Mike Rapoport <rppt@linux.ibm.com>
Subject: Re: [PATCH] mips: sgi-ip27: switch from DISCONTIGMEM to SPARSEMEM
Message-ID: <20190910113243.GA19207@rapoport-lnx>
References: <1567662477-27404-1-git-send-email-rppt@kernel.org>
 <20190905152150.f7ff6ef70726085de63df828@suse.de>
 <20190905133251.GA3650@rapoport-lnx>
 <20190905154831.88b7853b47ba7db7bd7626bd@suse.de>
 <20190905154747.GB3650@rapoport-lnx>
 <20190905233800.0f6b3fb3722cde2f5a88663a@suse.de>
 <20190906130223.GA17704@rapoport-lnx>
 <20190909182242.c1ef9717d14b20212ef75954@suse.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20190909182242.c1ef9717d14b20212ef75954@suse.de>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, Sep 09, 2019 at 06:22:42PM +0200, Thomas Bogendoerfer wrote:
> On Fri, 6 Sep 2019 16:02:24 +0300
> Mike Rapoport <rppt@kernel.org> wrote:
> 
> > I suspect that unaligned access comes from __page_to_pfn, can you please
> > check what scripts/fadd2line reports for kernel_init_free_pages+0xcc/0x138?
> 
> kernel_init_free_pages+0xcc/0x138:
> pagefault_disabled_dec at include/linux/uaccess.h:173
> (inlined by) pagefault_enable at include/linux/uaccess.h:200
> (inlined by) __kunmap_atomic at include/linux/highmem.h:101
> (inlined by) clear_highpage at include/linux/highmem.h:215
> (inlined by) kernel_init_free_pages at mm/page_alloc.c:1124
> 
> While making some sense out of this I booted the system a few times
> with the same kernel and I get different crashes (it even booted once
> to userspace).
> 
> Here a list (decoded with fadd2line)

... 
 
> I couldn't make real sense out of this yet, but maybe it gives
> a hint for you.

Unfortunately, no :(

Before we start adding printks, can you please run with
CONFIG_DEBUG_MEMORY_INIT=y and with 

mminit_loglevel=4 ignore_loglevel

in the command line?

> Thomas.
> 
> -- 
> SUSE Software Solutions Germany GmbH
> HRB 247165 (AG M?nchen)
> Gesch?ftsf?hrer: Felix Imend?rffer

-- 
Sincerely yours,
Mike.