[dm-devel] XFS getting EAGAIN from block device

[Marko Huttunen]

Hello,

After upgrading Ubuntu from 10.10 to 11.04 I started getting error messages
in my syslog when accessing one of my xfs partitions. It is not the root
partition.

The helpful team on IRC (#xfs on irc.freenode.net) says that what I want to
do is figure out why I'm getting -EAGAIN from the block device.

The error message I get when accessing the filesystem (through nautilus, or
in a terminal) is:

<snip>
Jun  7 18:08:14 picard kernel: [ 2602.542458] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c6dc18       ("xfs_trans_read_buf")
error 11 buf count 4096
Jun  7 18:08:14 picard kernel: [ 2602.548673] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c23898       ("xfs_trans_read_buf")
error 11 buf count 4096
Jun  7 18:08:14 picard kernel: [ 2602.553135] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c133a8       ("xfs_trans_read_buf")
error 11 buf count 4096
</snip>
... and so on.

The helpful team on IRC supplied me with a patch to understand the error
message alittle better.

Filename: hch_patch
<snip>
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1264,6 +1264,9 @@ xfs_buf_bio_end_io(
unsigned int            blocksize = bp->b_target->bt_bsize;
struct bio_vec          *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;

+       if (error && error != -EIO && error != -EOPNOTSUPP)
+               printk("XFS: got error %d in %s\n", error, __func__);
+
xfs_buf_ioerror(bp, -error);

if (!error && xfs_buf_is_vmapped(bp) && (bp->b_flags & XBF_READ))
</snip>

After fetching a new kernel source, unmounting my xfs partition, applying
the patch (running: "patch -p1 < hch_patch" in /usr/src/linux-2.6.38) and
making a new module (running: "make -C /lib/modules/`uname -r`/build
M=`pwd`/fs/xfs" in /usr/src/linux-2.6.38), removing the old module (running:
"rmmod xfs.ko") and then insmoding the new (running: "insmod xfs.ko") I get
the following error message:

<snip>
Jun  7 20:25:21 picard kernel: [10821.778982] XFS: got error -11 in
xfs_buf_bio_end_io
Jun  7 20:25:21 picard kernel: [10821.780263] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c6dc18       ("xfs_trans_read_buf")
error 11 buf count 4096XFS: got error -11 in xfs_buf_bio_end_io
Jun  7 20:25:21 picard kernel: [10821.781403] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c23898       ("xfs_trans_read_buf")
error 11 buf count 4096XFS: got error -11 in xfs_buf_bio_end_io
Jun  7 20:25:21 picard kernel: [10821.796254] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x41c133a8       ("xfs_trans_read_buf")
error 11 buf count 4096XFS: got error -11 in xfs_buf_bio_end_io
</snip>
... and so on.

After a while when for example extracting a zip archive I get the following
error messages:

<snip>
Jun  7 20:28:38 picard kernel: [11018.263647] XFS: got error -11 in
xfs_buf_bio_end_io
Jun  7 20:28:38 picard kernel: [11018.263842] XFS: got error -11 in
xfs_buf_bio_end_io
Jun  7 20:28:41 picard kernel: [11021.399311] XFS: got error -11 in
xfs_buf_bio_end_io
Jun  7 20:28:41 picard kernel: [11021.435716] I/O error in filesystem
("dm-4") meta-data dev dm-4 block 0x3a53bbf0       ("xfs_trans_read_buf")
error 11 buf count 4096
Jun  7 20:28:41 picard kernel: [11021.435724] xfs_force_shutdown(dm-4,0x1)
called from line 3894 of file /usr/src/linux-2.6.38/fs/xfs/xfs_bmap.c.
 Return address = 0xffffffffa0fa34a2
Jun  7 20:28:41 picard kernel: [11021.580677] Filesystem dm-4: I/O Error
Detected.  Shutting down filesystem: dm-4
Jun  7 20:28:42 picard kernel: [11021.580683] Please umount the filesystem,
and rectify the problem(s)
Jun  7 20:29:12 picard kernel: [11023.043494] Filesystem dm-4:
xfs_log_force: error 5 returned.
Jun  7 20:29:42 picard kernel: [11053.015272] Filesystem dm-4:
xfs_log_force: error 5 returned.
</snip>
... and so on

Accessing the device is slower than before the upgrade to 11.04, and it is
not without errors that I can access the device.

$ uname -r
Linux picard 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux


HW specs:
The XFS partition is run on a HW Raid on 2 x 1TB WD Black Caviar.
Motherboard is an ASUS Sabertooth P67 with Intel Sandy Bridge i5-2500K CPU @
3.30GHz.


Do you guys know what might be wrong, how I or you or we can solve this?


Regards,

Marko
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