Created attachment 492852 [details]
Simpe script to reproduce

Description of problem:
xfstests 243 shows corruption on btrfs. btrfsck returns error.

Version-Release number of selected component (if applicable):
2.6.32-131.0.1.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1. yum install rh-tests-kernel-filesystems-xfs-xfstests
2. cd /mnt/tests/kernel/filesystems/xfs/xfstests; ./install_all.sh
3. TEST_PARAM_FSTYPE=btrfs TEST_PARAM_RUNTESTS=017 make run

or use a simpler script attached
  
Actual results:
It's Test 5 and Test 6 causing the issue
=== 243.full ===
Test 1: Fallocate 40960 bytes and write 4096 bytes (buffered io).
Test 2: Fallocate 40960 bytes and write 4096 bytes (direct io).
Test 3: Fallocate 40960 bytes and write 40960 bytes (buffered io).
Test 4: Fallocate 40960 bytes and write 40960 bytes (direct io).
Test 5: Fallocate 128k, seek 256k and write 4k block (buffered io).
Test 6: Fallocate 128k, seek to 256k and write a 4k block (direct io).
_check_generic filesystem: filesystem on /dev/sda5 is inconsistent
*** fsck.btrfs output ***
root 5 inode 66910 errors 100
found 39845888 bytes used err is 1
total csum bytes: 35160
total tree bytes: 3506176
total fs tree bytes: 3153920
btree space waste bytes: 636211
file data blocks allocated: 36642816
 referenced 36155392
Btrfs Btrfs v0.19
*** end fsck.btrfs output
*** mount output ***
/dev/sda2 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1 on /boot type ext3 (rw)
/dev/sda7 on /mnt/xfstests/mnt3 type ext3 (rw)
/dev/sda8 on /mnt/xfstests/mnt4 type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/sda6 on /mnt/testarea/scratch type btrfs (rw,context="system_u:object_r:nfs_t:s0")
*** end mount output

Expected results:
Pass test

Additional info:
Failed beaker job
http://beaker-archive.app.eng.bos.redhat.com/beaker-logs/2011/04/731/73139/149513/1636945/6882169///test_log--kernel-filesystems-xfs-xfstests-243.log

This is not a regression, fails on 6.0 GA kernel