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Groups > linux.kernel > #1349427
| From | lokesh jaliminche <lokesh.jaliminche@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: ext2/3 using ext4 module mkdir IO error on pmem DAX mount |
| Date | 2016-03-03 18:30 +0100 |
| Message-ID | <r8Fez-21e-11@gated-at.bofh.it> (permalink) |
| References | <r88LE-3PD-3@gated-at.bofh.it> <r8pjs-7pC-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi,
I have tested it locally I am also getting same error but not
consistently. I have put some debug logs for debugging, as per the logs
it seems that block_group is not getting initialized properly. I am
not sure weather this is because of my patch. Need to debug more.
commands :
=========
[root@cli02-ws Desktop]# dd if=/dev/zero of=/mnt/test bs=1024 count=100000
[root@cli02-ws Desktop]# losetup /dev/loop4 /mnt/test
[root@cli02-ws Desktop]# mkfs.ext2 /mnt/test
[root@cli02-ws Desktop]# mount -t ext2 -o loop /mnt/test /mnt/test_ext4
[root@cli02-ws Desktop]# cd /mnt/test_ext4/
[root@cli02-ws test_ext4]# mkdir 1
mkdir: cannot create directory `1': Input/output error
[root@cli02-ws test_ext4]# mkdir 2
[root@cli02-ws test_ext4]# mkdir 3
mkdir: cannot create directory `3': Input/output error
[root@cli02-ws test_ext4]# mkdir 4
debug_logs :
=========
[root@cli02-ws Desktop]# tail -f /var/log/messages 2>&1 | tee faillog
Mar 3 13:13:27 cli02-ws kernel: [ 228.167307] EXT4-fs (loop0):
mounting ext2 file system using the ext4 subsystem
Mar 3 13:13:27 cli02-ws kernel: [ 228.169634] EXT4-fs (loop0):
mounted filesystem without journal. Opts: (null)
Mar 3 13:13:42 cli02-ws kernel: [ 243.506280] max_blocks_per_group : 7949
Mar 3 13:13:42 cli02-ws kernel: [ 243.506285] stats.free_clusters : 7949
Mar 3 13:13:42 cli02-ws kernel: [ 243.506287] inodes_per_group*f : 1928
Mar 3 13:13:42 cli02-ws kernel: [ 243.506290] stats.free_inodes : 1928
Mar 3 13:13:42 cli02-ws kernel: [ 243.506292] block_group
:2103884794 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Mar 3 13:13:42 cli02-ws kernel: [ 243.506295] group_count : 13
Mar 3 13:13:42 cli02-ws kernel: [ 243.506298] EXT4-fs error (device
loop0): ext4_get_group_desc:291: comm mkdir: block_group >=
groups_count - block_group = 2103884794, groups_count = 13
Mar 3 13:14:09 cli02-ws kernel: [ 270.809734] max_blocks_per_group : 7949
Mar 3 13:14:09 cli02-ws kernel: [ 270.809739] stats.free_clusters : 1452
Mar 3 13:14:09 cli02-ws kernel: [ 270.809742] inodes_per_group*f : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809744] stats.free_inodes : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809747] max_blocks_per_group : 7949
Mar 3 13:14:09 cli02-ws kernel: [ 270.809750] stats.free_clusters : 7677
Mar 3 13:14:09 cli02-ws kernel: [ 270.809752] inodes_per_group*f : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809755] stats.free_inodes : 1917
Mar 3 13:14:09 cli02-ws kernel: [ 270.809757] max_blocks_per_group : 7949
Mar 3 13:14:09 cli02-ws kernel: [ 270.809760] stats.free_clusters : 7691
Mar 3 13:14:09 cli02-ws kernel: [ 270.809762] inodes_per_group*f : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809765] stats.free_inodes : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809767] max_blocks_per_group : 7949
Mar 3 13:14:09 cli02-ws kernel: [ 270.809770] stats.free_clusters : 7949
Mar 3 13:14:09 cli02-ws kernel: [ 270.809772] inodes_per_group*f : 1928
Mar 3 13:14:09 cli02-ws kernel: [ 270.809775] stats.free_inodes : 1928
Mar 3 13:14:38 cli02-ws kernel: [ 299.081995] max_blocks_per_group : 7949
Mar 3 13:14:38 cli02-ws kernel: [ 299.082038] stats.free_clusters : 7949
Mar 3 13:14:38 cli02-ws kernel: [ 299.082040] inodes_per_group*f : 1928
Mar 3 13:14:38 cli02-ws kernel: [ 299.082042] stats.free_inodes : 1928
Mar 3 13:14:38 cli02-ws kernel: [ 299.082045] block_group
:1066167208<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Mar 3 13:14:38 cli02-ws kernel: [ 299.082048] group_count : 13
Mar 3 13:14:38 cli02-ws kernel: [ 299.082051] EXT4-fs error (device
loop0): ext4_get_group_desc:291: comm mkdir: block_group >=
groups_count - block_group = 1066167208, groups_count = 13
Mar 3 13:14:48 cli02-ws kernel: [ 309.138432] max_blocks_per_group : 7949
Mar 3 13:14:48 cli02-ws kernel: [ 309.138436] stats.free_clusters : 7949
Mar 3 13:14:48 cli02-ws kernel: [ 309.138439] inodes_per_group*f : 1928
Mar 3 13:14:48 cli02-ws kernel: [ 309.138452] stats.free_inodes : 1928
Regards,
Lokesh
On Thu, Mar 3, 2016 at 5:58 AM, Ross Zwisler
<ross.zwisler@linux.intel.com> wrote:
> On Wed, Mar 02, 2016 at 02:43:04PM +0800, Xiong Zhou wrote:
>> Hi,
>>
>> mkdir failed IO error on pmem DAX ext2/3 fs mount using ext4 module.
>>
>> This happends only on -next tree, not on Linus' tree,
>> at least from 4.5.0-rc5-next-20160224.
>
> I was able to reproduce this and bisect it to the following commit:
>
> commit 1f2d779fed21 ("ext4: optimize group search for inode allocation")
>
> The fact that DAX was enabled in this failure was a red herring - it fails
> without DAX as well. The key is just that we're mounting an ext2 formatted
> filesystem using the ext4 module, I think.
>
> - Ross
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Re: ext2/3 using ext4 module mkdir IO error on pmem DAX mount Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-03-03 01:30 +0100
Re: ext2/3 using ext4 module mkdir IO error on pmem DAX mount lokesh jaliminche <lokesh.jaliminche@gmail.com> - 2016-03-03 18:30 +0100
Re: ext2/3 using ext4 module mkdir IO error on pmem DAX mount Theodore Ts'o <tytso@mit.edu> - 2016-03-04 00:50 +0100
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