Is this useful to anyone?

Got this after a crash/reboot:

        if (block_rsv) {
                WARN_ON(block_rsv->size > 0);  <<<<<<<<<<<<<<<<<<<<<<
                btrfs_free_block_rsv(root, block_rsv);
        }

------------[ cut here ]------------
WARNING: at fs/btrfs/inode.c:2165 btrfs_orphan_commit_root+0xcb/0xdf()
Hardware name: 2429A78
Modules linked in: tun ppdev cpufreq_userspace cpufreq_stats 
cpufreq_conservative cpufreq_powersave rfcomm bnep autofs4 pci_stub vboxpci(O) 
vboxnetadp(O) vboxnetflt(O) vboxdrv(O) binfmt_misc uinput nfsd auth_rpcgss 
nfs_acl nfs lockd fscache sunrpc fuse configs parport_pc lp parport 
input_polldev loop firewire_sbp2 firewire_core crc_itu_t ecryptfs 
snd_hda_codec_realtek uvcvideo videobuf2_vmalloc videobuf2_memops 
videobuf2_core videodev media btusb bluetooth hid_generic usbhid hid arc4 
coretemp kvm_intel kvm iwldvm ghash_clmulni_intel mac80211 snd_hda_intel 
snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss iTCO_wdt snd_pcm 
iTCO_vendor_support snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi 
snd_seq battery thinkpad_acpi tpm_tis nvram ac tpm snd_seq_device tpm_bios 
snd_timer snd evdev iwlwifi wmi cfg80211 sdhci_pci i915 rfkill sdhci microcode 
mmc_core video pcspkr psmouse lpc_ich e1000e soundcore serio_raw button mei 
drm_kms_helper drm xhci_hcd ehci_hcd i2c_i801 i2c_algo_bit acpi_cpufreq mperf 
i2c_core usbcore usb_common processor raid456 multipath dm_snapshot dm_mirror 
dm_region_hash dm_log dm_crypt dm_mod async_raid6_recov async_pq async_xor 
raid6_pq async_memcpy async_tx xor blowfish_x86_64 blowfish_common ecb 
crc32c_intel aesni_intel xts aes_x86_64 lrw gf128mul ablk_helper cryptd thermal 
thermal_sys
Pid: 500, comm: btrfs-transacti Tainted: G           O 
3.7.8-amd64-preempt-20130222 #1
Call Trace:
 [<ffffffff81040ed4>] warn_slowpath_common+0x7e/0x96
 [<ffffffff811f75c5>] ? alloc_extent_state+0x59/0xa4
 [<ffffffff81040f01>] warn_slowpath_null+0x15/0x17
 [<ffffffff811e972f>] btrfs_orphan_commit_root+0xcb/0xdf
 [<ffffffff811e3954>] commit_fs_roots.isra.24+0x99/0x153
 [<ffffffff814c1ed6>] ? _raw_spin_lock+0x1b/0x1f
 [<ffffffff814c2059>] ? _raw_spin_unlock+0x27/0x32
 [<ffffffff811e47e8>] btrfs_commit_transaction+0x45a/0x954
 [<ffffffff8105d4be>] ? add_wait_queue+0x44/0x44
 [<ffffffff811de8a6>] transaction_kthread+0xe7/0x18a
 [<ffffffff811de7bf>] ? try_to_freeze+0x33/0x33
 [<ffffffff8105cc31>] kthread+0x88/0x90
 [<ffffffff8105cba9>] ? kthread_freezable_should_stop+0x39/0x39
 [<ffffffff814c6b3c>] ret_from_fork+0x7c/0xb0
 [<ffffffff8105cba9>] ? kthread_freezable_should_stop+0x39/0x39
---[ end trace ee93ff454aca9d81 ]---

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Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
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