linux-ext4 - Re: "make check" broken on maint branch?

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Date:	Mon, 4 Nov 2013 14:20:40 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	"Dilger, Andreas" <andreas.dilger@...el.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: "make check" broken on maint branch?

On Fri, Nov 01, 2013 at 12:48:34PM -0400, Theodore Ts'o wrote:
> On Fri, Nov 01, 2013 at 09:12:37PM +0800, Zheng Liu wrote:
> > > Hmm.... it works for me.  Run while r_64bit_big_expand is running:
> > > 
> > > % ls -l tmp
> > > ...
> > > 24896 -rw-r--r--. 1 tytso      tytso      2199023255552 Oct 31 23:17 e2fsprogs-tmp.pkOcCc
> > > ...
> > 
> > $ ls -l /tmp
> > -rw-rw-r-- 1 wenqing wenqing 536870912 Nov  1 21:03 e2fsprogs-tmp.x8yzKP
> 
> Well, I got this by running "./test_script r_64bit_big_expand" and
> then typing ^Z to stop the test mid-stream, and then looking in /tmp.

Thanks for letting me know.

> 
> But a simpler thing to do is to simply run the following commands:
> 
> truncate -s 2T /tmp/foo.img
> mke2fs -t ext4 -F /tmp/foo.img
> 
> ... and see if it works correctly.  I'm wondering if the problem is
> that a file limit was set, although that would result in a core dump:
> 
> % bash
> % ulimit -f 131072
> % truncate -s 2T /tmp/foo.img
> File size limit exceeded (core dumped)
> % exit
> 
> .... so that doesn't seem to be it.  Anyway, the problem seems to be
> that trying to create a sparse 2T file during the test is what's
> causing the problem that you and Andreas are seeing.  If this theory
> is question, the next question is what's causing the failure to write
> files whose i_size is greater than 2T.

It seems that I know the reason why tests failed.  That is because my
/tmp directory is a ext3 file system, and I couldn't create a big sparse
file like this 'truncate -s 2T /tmp/foo.img'.  So I did the following
test in my sand box.

% sudo mke2fs -t ext4 ${DEV} # I create a new ext4 file system
% sudo mount -t ext4 ${DEV} /tmp # mount this file system on /tmp
% sudo chmod 777 -R /tmp
% cd $E2FSPROGS
% make check

Then r_64bit_big_expand, r_bigalloc_big_expand and r_ext4_big_expand can
survive.  So I guess that the root cause is this.

Andreas, could you please confirm my guess?

BTW, after that, I still get a failure.  That is f_extent_oobounds.  So
we still need to take a closer look at this problem.

                                                - Zheng
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