linux-kernel - Re: ZRAM 3.10.6 Buffer I/O error

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Date:	Tue, 13 Aug 2013 15:03:54 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Thomas Backlund <tmb@...eia.org>,
	Jordi Pujol <jordipujolp@...il.com>, stable@...r.kernel.org,
	Jiang Liu <jiang.liu@...wei.com>, linux-kernel@...r.kernel.org
Subject: Re: ZRAM 3.10.6 Buffer I/O error

On Mon, Aug 12, 2013 at 10:47:12PM -0700, Greg Kroah-Hartman wrote:
> On Tue, Aug 13, 2013 at 02:18:29PM +0900, Minchan Kim wrote:
> > On Tue, Aug 13, 2013 at 08:01:11AM +0300, Thomas Backlund wrote:
> > > Minchan Kim skrev 13.8.2013 07:33:
> > > >Hello Greg,
> > > >
> > > >On Mon, Aug 12, 2013 at 08:58:02PM -0700, Greg Kroah-Hartman wrote:
> > > >>On Tue, Aug 13, 2013 at 10:39:00AM +0900, Minchan Kim wrote:
> > > >>>Hello,
> > > >>>
> > > >>>On Mon, Aug 12, 2013 at 07:39:46PM +0300, Thomas Backlund wrote:
> > > >>>>12.08.2013 17:27, Jordi Pujol skrev:
> > > >>>>>Hello,
> > > >>>>>
> > > >>>>>zram shows an error when mounting a swap partition,
> > > >>>>>current version Linux kernel 3.10.6,
> > > >>>>>previous versions worked, I suppose that latest zram patches have some
> > > >>>>>problem,
> > > >>>>>
> > > >>>>>machine is an AMD64 dual core, 4GB RAM
> > > >>>>>
> > > >>>>>+ modprobe -qb zram num_devices=2
> > > >>>>>+ echo 104857600 > /sys/block/zram0/disksize
> > > >>>>>
> > > >>>>># mkswap /dev/zram0
> > > >>>>>Setting up swapspace version 1, size = 102396 KiB
> > > >>>>>no label, UUID=6c249930-2ba0-46cf-a8c6-766481942b7d
> > > >>>>>
> > > >>>>># pager /var/log/dmesg
> > > >>>>>(no more errors shown)
> > > >>>>>
> > > >>>>># swapon /dev/zram0
> > > >>>>>
> > > >>>>># pager /var/log/dmesg
> > > >>>>>...
> > > >>>>>[  309.300479] Buffer I/O error on device zram0, logical block 25599
> > > >>>>>[  309.300491] Buffer I/O error on device zram0, logical block 25599
> > > >>>>>[  309.300514] Buffer I/O error on device zram0, logical block 25599
> > > >>>>>[  345.205887] Adding 102396k swap on /dev/zram0.  Priority:-2 extents:1
> > > >>>>>across:102396k SSFS
> > > >>>>>
> > > >>>>>full log files and the kernel source are stored in the address:
> > > >>>>>
> > > >>>>>http://livenet.selfip.com/ftp/debian/zram_3.10.6_IO_error/
> > > >>>>>
> > > >>>>
> > > >>>>
> > > >>>>I think this one should fix it and belongs in 3.10 stable too:
> > > >>>
> > > >>>Very true. Let's Cc Greg, explicitely.
> > > >>
> > > >>-ENOCONTEXT
> > > >
> > > >https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/staging/zram?id=75c7caf5a052ffd8db3312fa7864ee2d142890c4
> > > >
> > > >It seems you already merge "zram:allow request end to conincide with disksize" to stable.
> > > >So there is no concern any more.
> > > 
> > > Nope...
> > > 
> > > thats master branch wich tracks upstream tree...
> > > 
> > > it's not in the 3.10 stable as of 3.10.6 (or current stable queue)
> > > 
> > > https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/drivers/staging/zram?h=linux-3.10.y
> > 
> > Okay, Then, we should explain it to Greg.
> > 
> > While Jiang was fixing a BUG A with [1], [1] made another BUG B.
> > So, Sergey fixed BUG B with [2]. But unfortunately, [1] was in stable
> > now but [2] wasn't so [2] should go to the stable to fix BUG B.
> > 
> > [1] 12a7ad3b8, zram: avoid access beyond the zram device
> > [2] 75c7caf5a, zram: allow request end to coincide with disksize
> 
> Ok, but that's what Thomas's original email to stable@...r.kernel.org
> asked for, to apply the 2nd patch above to the stable tree, which I've
> already done...
> 
> Emailing me directly, with half-of-a-thread causes me nothing but
> confusion, as I'm sure you can imagine.

Sorry for the noise and I will keep in mind.
Thanks!

-- 
Kind regards,
Minchan Kim
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