linux-ext4 - Re: 4.2 kernel trace when hot unplug a mounted USB/SATA/MMC devices with ext2/ext3/ext4 file system

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Message-ID: <CADaLNDnupucoQ=7uAEHOfRaEEDZYUORwjC_VcHnBCUfdAoPSdQ@mail.gmail.com>
Date:	Mon, 24 Aug 2015 14:20:07 -0700
From:	Duc Dang <dhdang@....com>
To:	Christoph Hellwig <hch@....de>
Cc:	Jan Kara <jack@...e.cz>,
	"Darrick J. Wong" <darrick.wong@...cle.com>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jan Kara <jack@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org, USB list <linux-usb@...r.kernel.org>,
	patches <patches@....com>
Subject: Re: 4.2 kernel trace when hot unplug a mounted USB/SATA/MMC devices
 with ext2/ext3/ext4 file system

On Sat, Aug 15, 2015 at 1:58 AM, Christoph Hellwig <hch@....de> wrote:
> On Fri, Aug 14, 2015 at 05:52:44PM -0700, Duc Dang wrote:
>> The commit 08439fec26 "ext4: remove block_device_ejected" only causes
>> issue with ext4 and
>> trying reverting it helps our test passes with ext4.
>>
>> But how about the same issue with ext2/ext3?
>
> I tried to fix the underlying issue, but I either failed to fully
> fixed it or someone regressed it.
>
> Can you if rev 08439fec26 on it's own works to see if I missed
> a case or it was regressed later?

For more information. We tested kernel at commit 5f80f62ada "ext4:
remove useless condition in if statement."
(right before your commit) and still saw the issue.

df3305156f989339529b3d6744b898d498fb1f7b [media] v4l: xilinx: Add
Xilinx Video IP core
08439fec266c3cc5702953b4f54bdf5649357de0 ext4: remove block_device_ejected
5f80f62adae2a2920781a847805d34b36b323f7d ext4: remove useless
condition in if statement.
c9bca8b33118573da9b7ac2ea21947a8e4d287dd [media] v4l: of: Add
v4l2_of_parse_link() function

Further more, the issue does not happen with 3.19-rc7 but happens with 4.00-rc1

-- 
Regards,
Duc Dang.
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