linux-ext4 - 答复: ext4 error

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Date:	Thu, 14 Apr 2016 02:02:18 +0000
From:	Eric Shang <EricShang@...oxin.com>
To:	Toshi Kani <toshi.kani@....com>,
	Matthew Wilcox <willy@...ux.intel.com>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"david@...morbit.com" <david@...morbit.com>,
	"jack@...e.cz" <jack@...e.cz>, "tytso@....edu" <tytso@....edu>,
	"adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"xfs@....sgi.com" <xfs@....sgi.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 答复: ext4 error

Hi Toshi:
	Thanks! I think this not relate to DAX and dax_get_unmapped_area, I am a junior kernel maintainer for our company. This issue bother me long time, looks like kernel ext4 issue or our emmc driver issue, I will dig it out, Thanks!

Best Regards
EricShang


-----邮件原件-----
发件人: Toshi Kani [mailto:toshi.kani@....com] 
发送时间: 2016年4月13日 22:10
收件人: Eric Shang; Matthew Wilcox
抄送: akpm@...ux-foundation.org; dan.j.williams@...el.com; viro@...iv.linux.org.uk; ross.zwisler@...ux.intel.com; kirill.shutemov@...ux.intel.com; david@...morbit.com; jack@...e.cz; tytso@....edu; adilger.kernel@...ger.ca; linux-nvdimm@...ts.01.org; linux-fsdevel@...r.kernel.org; linux-ext4@...r.kernel.org; xfs@....sgi.com; linux-kernel@...r.kernel.org
主题: Re: ext4 error

On Wed, 2016-04-13 at 13:44 +0000, Eric Shang wrote:
> HI All:
>   I meet an ext4 error, following is the error log. After panic, I 
> check the emmc by the tool debufs, the inode 69878 i_nlink is not 
> zero. And this inode don't belong to parent dir 6987, it belong to 
> other file(this inode belong to two files when check by debugfs 
> ncheck), I guess than this inode has beed deleted in memory and 
> already used by other file. But the parent dentry buff_head not flush 
> to emmc. But when lookup this dentry can't find it' in dentry cache, 
> and then lookup_real, read the dentry from emmc, get the file inode which already be deleted.
>   Can any give me some help how to check this issue. My kernel version 
> is 3.18 form Android . I thinks something wrong with dentry cache 
> flush and dirty buff_head flush to emmc. Thanks all!

Are you somehow using DAX and my dax_get_unmapped_area patches in your Android
3.18 kernel? I doubt this is the case, but I thought I should check since you reported it to me and Matthew with the same cc list.

If you are simply using a distributed Android kernel, you should report it to Android email list or bug tracker.

-Toshi