* Warning: bad fsid on block 20971520
@ 2012-01-11 15:46 David Sterba
2012-01-11 16:37 ` Chris Mason
0 siblings, 1 reply; 6+ messages in thread
From: David Sterba @ 2012-01-11 15:46 UTC (permalink / raw)
To: linux-btrfs
Hi,
the $subj warning appears sometimes in syslog, in my case when
xfstests/209 runs looped. The minimal reproducer is looped mkfs+mount.
The message comes from disk-io.c btree_readpage_end_io_hook():
581 if (check_tree_block_fsid(root, eb)) {
582 printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n",
583 (unsigned long long)eb->start);
584 ret = -EIO;
585 goto err;
586 }
relevant syslog messages:
[420367.199710] device fsid dda1a3db-3106-4bb9-8ecf-2e823938d538 devid 1 transid 4 /dev/sda9
[420367.209438] btrfs: force lzo compression
[420367.214695] btrfs: enabling inode map caching
[420367.220404] btrfs: enabling auto defrag
[420367.224193] btrfs: disk space caching is enabled
[420367.323356] btrfs bad fsid on block 20971520
[420367.358349] btrfs bad fsid on block 20971520
[420367.368272] btrfs bad fsid on block 20971520
[420367.376239] btrfs bad fsid on block 20971520
[420367.381836] btrfs bad fsid on block 20971520
[420367.467332] btrfs bad fsid on block 20971520
[420367.473249] btrfs bad fsid on block 20971520
[420367.478649] btrfs: failed to read chunk root on sda9
[420367.487810] btrfs: open_ctree failed
and mount fails.
/proc/partitions:
8 9 10485760 sda9
10485760*1024 bytes, which is 2621440 4k blocks.
The number 20971520 is not a block number, rather byte offset, so the
message might be confusing first. Real block number is
20971520 / 4096 = 20480
used blocks on a freshly created device:
File size of test-10g is 10737418240 (10485760 blocks, blocksize 1024)
ext logical physical expected length flags
0 0 10248192 2048
1 4096 10252288 10250239 20
2 20480 10293248 10252307 4
3 28672 10301440 10293251 4
4 36864 10260480 10301443 24
5 65536 10264576 10260503 4
6 1085440 10276864 10264579 24
7 10483712 294912 10276887 2048 eof
it's "extent" nr. 2, not a superblock. The block obviously does not
contain the exptected data, though they were submitted and supposed to
be written by the mkfs step. The question is, where the update is lost --
block layer, write caches of the disk.
btrfs-debug-tree says it's:
chunk tree
leaf 20971520 items 6 free space 3283 generation 4 owner 3
fs uuid 024cd2e6-d584-493c-af81-fa3e2f548abb
chunk uuid 3f52ec70-89a9-4cd5-b5f0-177d7ae63de3
item 0 key (DEV_ITEMS DEV_ITEM 1) itemoff 3897 itemsize 98
dev item devid 1 total_bytes 10737418240 bytes used 2185232384
item 1 key (FIRST_CHUNK_TREE CHUNK_ITEM 0) itemoff 3817 itemsize 80
chunk length 4194304 owner 2 type 2 num_stripes 1
stripe 0 devid 1 offset 0
item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 4194304) itemoff 3737 itemsize 80
chunk length 8388608 owner 2 type 4 num_stripes 1
stripe 0 devid 1 offset 4194304
item 3 key (FIRST_CHUNK_TREE CHUNK_ITEM 12582912) itemoff 3657 itemsize 80
chunk length 8388608 owner 2 type 1 num_stripes 1
stripe 0 devid 1 offset 12582912
item 4 key (FIRST_CHUNK_TREE CHUNK_ITEM 20971520) itemoff 3545 itemsize 112
chunk length 8388608 owner 2 type 34 num_stripes 2
stripe 0 devid 1 offset 20971520
stripe 1 devid 1 offset 29360128
item 5 key (FIRST_CHUNK_TREE CHUNK_ITEM 29360128) itemoff 3433 itemsize 112
chunk length 1073741824 owner 2 type 36 num_stripes 2
stripe 0 devid 1 offset 37748736
stripe 1 devid 1 offset 1111490560
david
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Warning: bad fsid on block 20971520
2012-01-11 15:46 Warning: bad fsid on block 20971520 David Sterba
@ 2012-01-11 16:37 ` Chris Mason
2012-01-11 22:34 ` David Sterba
0 siblings, 1 reply; 6+ messages in thread
From: Chris Mason @ 2012-01-11 16:37 UTC (permalink / raw)
To: linux-btrfs
On Wed, Jan 11, 2012 at 04:46:21PM +0100, David Sterba wrote:
> Hi,
>
> the $subj warning appears sometimes in syslog, in my case when
> xfstests/209 runs looped. The minimal reproducer is looped mkfs+mount.
I've been seeing this as well. It's new with 3.2, and I haven't yet
been able to track it down.
The first thing that happens when we mount the FS is a block layer
invalidate, and that must be dropping the write.
It's also possible (but very unlikely) that mkfs.btrfs is neglecting to
write that block.
Do you have a reliable way to reproduce? If so, can you try with a much
older mkfs.btrfs.
-chris
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Warning: bad fsid on block 20971520
2012-01-11 16:37 ` Chris Mason
@ 2012-01-11 22:34 ` David Sterba
2012-01-11 22:54 ` Chris Mason
2012-01-16 14:34 ` David Sterba
0 siblings, 2 replies; 6+ messages in thread
From: David Sterba @ 2012-01-11 22:34 UTC (permalink / raw)
To: Chris Mason, linux-btrfs
On Wed, Jan 11, 2012 at 11:37:14AM -0500, Chris Mason wrote:
> I've been seeing this as well. It's new with 3.2, and I haven't yet
> been able to track it down.
>
> The first thing that happens when we mount the FS is a block layer
> invalidate, and that must be dropping the write.
>
> It's also possible (but very unlikely) that mkfs.btrfs is neglecting to
> write that block.
>
> Do you have a reliable way to reproduce? If so, can you try with a much
> older mkfs.btrfs.
I built mkfs from v0.19 and let 209 loop again, the error appeared 6x
during 3 hours, the last 5 occurences within 10 minutes. Should I try
even older mkfs?
I will try to catch it with blktrace running.
thanks,
david
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Warning: bad fsid on block 20971520
2012-01-11 22:34 ` David Sterba
@ 2012-01-11 22:54 ` Chris Mason
2012-01-16 14:34 ` David Sterba
1 sibling, 0 replies; 6+ messages in thread
From: Chris Mason @ 2012-01-11 22:54 UTC (permalink / raw)
To: linux-btrfs
On Wed, Jan 11, 2012 at 11:34:34PM +0100, David Sterba wrote:
> On Wed, Jan 11, 2012 at 11:37:14AM -0500, Chris Mason wrote:
> > I've been seeing this as well. It's new with 3.2, and I haven't yet
> > been able to track it down.
> >
> > The first thing that happens when we mount the FS is a block layer
> > invalidate, and that must be dropping the write.
> >
> > It's also possible (but very unlikely) that mkfs.btrfs is neglecting to
> > write that block.
> >
> > Do you have a reliable way to reproduce? If so, can you try with a much
> > older mkfs.btrfs.
>
> I built mkfs from v0.19 and let 209 loop again, the error appeared 6x
> during 3 hours, the last 5 occurences within 10 minutes. Should I try
> even older mkfs?
Nah, I'd try the latest mkfs on a 3.0 kernel. I think its a change to
the block device invalidate code that happens on mount.
-chris
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Warning: bad fsid on block 20971520
2012-01-11 22:34 ` David Sterba
2012-01-11 22:54 ` Chris Mason
@ 2012-01-16 14:34 ` David Sterba
2012-01-16 18:36 ` David Sterba
1 sibling, 1 reply; 6+ messages in thread
From: David Sterba @ 2012-01-16 14:34 UTC (permalink / raw)
To: Chris Mason, linux-btrfs
On Wed, Jan 11, 2012 at 11:34:34PM +0100, David Sterba wrote:
> I will try to catch it with blktrace running.
Measurement disrupted the experiment. The second I start blktrace, these
messages
[450482.299863] device fsid 7f7bfb60-b8f3-457e-857a-9a1a187f750f devid 1 transid 7 /dev/sda9
[450482.309642] btrfs: force lzo compression
[450482.314802] btrfs: enabling inode map caching
[450482.320363] btrfs: enabling auto defrag
[450482.324138] btrfs: disk space caching is enabled
[450482.378652] btrfs: failed to read chunk root on sda9
[450482.385397] btrfs: open_ctree failed
appear in the log, mount fails and the test is not performed. (And
immediately stop when blktrace stops.)
There are a few occurances of the
[450491.373282] btrfs bad fsid on block 20971520
message. Blktrace log does not contain any record of 'mkfs' activity,
the other involved process are there (mount, aio-dio, kernel threads).
The other day I saw
[ 8334.490486] device fsid 830e57b6-b9c3-471c-b4dc-4a8c2c56fb35 devid 1 transid 4 /dev/sda9
[ 8334.500482] btrfs: force lzo compression
[ 8334.505853] btrfs: enabling inode map caching
[ 8334.511539] btrfs: enabling auto defrag
[ 8334.515234] btrfs: disk space caching is enabled
[ 8334.532517] btrfs 0 12582912
[ 8334.551594] btrfs bad tree block start 20971520 12582912
[ 8334.560353] btrfs bad tree block start 0 12582912
[ 8334.568263] btrfs bad tree block start 20971520 12582912
[ 8334.575188] btrfs bad tree block start 20971520 12582912
[ 8334.581946] btrfs bad tree block start 0 12582912
[ 8334.588044] btrfs bad tree block start 20971520 12582912
[ 8334.594543] btrfs: failed to read chunk root on sda9
[ 8334.601040] btrfs: open_ctree failed
a different instance of the the same. So this looks rather serious.
Per your advice, I'll try to test with other filesystems, with older
kernels, and in btrfs case add fsync into mkfs.
david
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Warning: bad fsid on block 20971520
2012-01-16 14:34 ` David Sterba
@ 2012-01-16 18:36 ` David Sterba
0 siblings, 0 replies; 6+ messages in thread
From: David Sterba @ 2012-01-16 18:36 UTC (permalink / raw)
To: Chris Mason, linux-btrfs
On Mon, Jan 16, 2012 at 03:34:28PM +0100, David Sterba wrote:
> Per your advice, I'll try to test with other filesystems, with older
> kernels, and in btrfs case add fsync into mkfs.
I left looping the 3.0.13 based sles kernel and did not trigger the
warning for several hours.
In the meantime I grepped through my serial console logs and found that
first 'bad fsid' message appeared in 3.0.0-rc5+ dated to 2011-06-01:
[73673.623530] device fsid 5f1b5c0e-21ff-4896-bf48-8d64558dd205 devid 1 transid 7 /dev/sdb10
[73673.633194] btrfs: enabling auto defrag
[73673.636915] btrfs: enabling disk space caching
[73673.644124] btrfs: enabling inode map caching
[73673.649733] btrfs: force lzo compression
[73673.740630] btrfs bad fsid on block 20971520
[73673.746400] btrfs bad fsid on block 20971520
[73673.760785] btrfs bad fsid on block 20971520
[73673.766284] btrfs: failed to read chunk root on sdb10
[73673.772969] btrfs warning page private not zero on page 20971520
[73673.792224] btrfs: open_ctree failed
and there are several messages from 3.1.0-rc4 kernel, no more occurences
of "page private not zero" message.
david
^ permalink raw reply [flat|nested] 6+ messages in thread
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2012-01-11 15:46 Warning: bad fsid on block 20971520 David Sterba
2012-01-11 16:37 ` Chris Mason
2012-01-11 22:34 ` David Sterba
2012-01-11 22:54 ` Chris Mason
2012-01-16 14:34 ` David Sterba
2012-01-16 18:36 ` David Sterba
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