generic/247 triggers warnings occasionally

[Eryu Guan]

On Fri, May 29, 2015 at 02:32:14PM +0800, Eryu Guan wrote:
> Hi all,
> 
> I've seen generic/247 trigger the following warning occasionally, on
> 4.1.0-rc5 kernel. And I can reproduce it back on 4.0.0 kernel.
> 
[snip]
> 
> Attachments are my xfstests config file and host info requested by
> http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F

More info on host info here.

It's a RHEL7 kvm guest running on RHEL6.6, running upstream kernel. The
disk configuration in guest xml is

<disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/home/osimage/rhel7.img'/>
      <target dev='hda' bus='ide'/>
      <alias name='ide0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>

This is xfs_info output of $TEST_DIR after the warning.

[root at dhcp-66-86-11 xfstests]# xfs_info /mnt/testarea/test/
meta-data=/dev/sda5              isize=256    agcount=4, agsize=983040 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=3932160, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

I also attached the compressed full dmesg log.

And I do reproduce it on another bare metal host, which has 12 logical
cpus and 16G memory, tested with 12G lvm device.

Thanks,
Eryu
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