Oops when moving data to subvolume

Hi,
i was fiddling around with btrfs yesterday to implement backup with readonly snapshots, but i got the kernel-oops below.

Im using zlib compression with btrfs and rsynced a whole linux system (~2GB) into /backup/servername-subdir

=46or better snapshot handling i decided to create a dedicated subdir for each server to be backed up, so i renamed that dir to /backup/servername-subdir-tmp, created /backup/servername-subvol and tried moving the data from the subdir to the subvol.

After half of the data being transferred, i hit the oops.

The system is an older, via ezra based mini-pc with 512MB RAM , debian 6.0.3 and the kernel from the testing repo. The btrfs tools are the lat= est
version from git.

uname -a:
Linux dingbackup 3.1.0-1-486 #1 Mon Nov 14 07:36:41 UTC 2011 i686 GNU/L= inux

The system is slow, but it should be a tiny backup box for another, similar machine, so the backup-runtime does not matter and i favour diskspace over speed.

Im actually trying to reproduce the issue on another system, but did not yet succeed, so im not perfectly sure if this is not related to ha= rdware
issue. But the system was stable so far and i did a very in depth-test = of
the harddisk before re-install and formatting with btrfs -=C2=A0 includ= ing md5
checksumming and had no defects before and did not see any block-level errors before the oops.

regards
Roland

[ 3246.471638] ------------[ cut here ]------------
[ 3246.471729] kernel BUG at /build/buildd-linux-2.6_3.1.1-1-i386-6vi5g=
Y/linux-2.6-3.1.1/debian/build/source_i386_none/fs/btrfs/transaction.c:=
1244!
[ 3246.471824] invalid opcode: 0000 [#1]
[ 3246.471911] Modules linked in: loop snd_via82xx gameport snd_ac97_co=

dec ac97_bus snd_mpu401_uart via686a snd_rawmidi tpm_tis tpm tpm_bios e= vdev snd_seq_device snd_pcm snd_timer i2c_viapro processor parport_pc s= nd_page_alloc snd i2c_core thermal_sys soundcore button parport pcspkr = shpchp pci_hotplug ext3 jbd mbcache btrfs zlib_deflate crc32c libcrc32c=
sd_mod crc_t10dif ata_generic pata_via libata uhci_hcd scsi_mod ehci_h=
cd usbcore 8139too 8139cp mii [last unloaded: scsi_wait_scan]

[ 3246.472017]
[ 3246.472017] Pid: 517, comm: btrfs-transacti Not tainted 3.1.0-1-486 =
#1 VIA Technologies, Inc. VT8605/8605-686
[ 3246.472017] EIP: 0060:[<e019acad>] EFLAGS: 00010282 CPU: 0
[ 3246.472017] EIP is at btrfs_commit_transaction+0x188/0x5c5 [btrfs]
[ 3246.472017] EAX: fffffffe EBX: 00000000 ECX: fffffffe EDX: 00000022
[ 3246.472017] ESI: d4b158b8 EDI: dc595c00 EBP: ddf043f8 ESP: ddb61f4c
[ 3246.472017]=C2=A0 DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
[ 3246.472017] Process btrfs-transacti (pid: 517, ti=3Dddb60000 task=3D=
dc4ee810 task.ti=3Dddb60000)
[ 3246.472017] Stack:
[ 3246.472017]=C2=A0 00000246 d4b15904 00000000 00000000 00070194 00000=
000 dc4ee810 c1035f22
[ 3246.472017]=C2=A0 ddb61f6c ddb61f6c 00000000 00000000 dc595d10 dc595=
c00 dc4ee810 dc595c00
[ 3246.472017]=C2=A0 dc4ee810 0000036c 00000000 e0196516 dc4ee810 00000=
282 dc7cddb4 e0196419
[ 3246.472017] Call Trace:
[ 3246.472017]=C2=A0 [<c1035f22>] ? finish_wait+0x3e/0x3e
[ 3246.472017]=C2=A0 [<e0196516>] ? transaction_kthread+0xfd/0x189 [btr=
fs]
[ 3246.472017]=C2=A0 [<e0196419>] ? btrfs_congested_fn+0x5f/0x5f [btrfs=
]
[ 3246.472017]=C2=A0 [<c101bc7d>] ? complete+0x23/0x2b
[ 3246.472017]=C2=A0 [<e0196419>] ? btrfs_congested_fn+0x5f/0x5f [btrfs=
]
[ 3246.472017]=C2=A0 [<c1035a4a>] ? kthread+0x62/0x67
[ 3246.472017]=C2=A0 [<c10359e8>] ? flush_kthread_worker+0x73/0x73
[ 3246.472017]=C2=A0 [<c1275306>] ? kernel_thread_helper+0x6/0xd
[ 3246.472017] Code: 00 00 00 89 f8 e8 ad ae 00 00 31 d2 b9 01 00 00 00=
 89 f8 e8 c5 3d 01 00 85 c0 74 02 0f 0b 89 fa 89 e8 e8 38 3d 03 00 85 c=
0 74 02 <0f> 0b ba 01 00 00 00 89 f8 e8 4e 41 01 00 b9 02 00 00 00 8b 4=
4
[ 3246.472017] EIP: [<e019acad>] btrfs_commit_transaction+0x188/0x5c5 [=
btrfs] SS:ESP 0068:ddb61f4c
[ 3246.479172] ---[ end trace 489019f343161a4d ]---

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