linux-kernel - Re: ext4 error

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Message-ID: <1460556627.24985.28.camel@hpe.com>
Date:	Wed, 13 Apr 2016 08:10:27 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	Eric Shang <EricShang@...oxin.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: 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