Additional info: WARNING: at fs/btrfs/extent-tree.c:5134 __btrfs_free_extent+0x833/0x870 [btrfs]() Hardware name: 1225B Modules linked in: ebtables ip6table_filter ip6_tables be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi rfcomm bnep arc4 brcmsmac cordic brcmutil mac80211 cfg80211 eeepc_wmi asus_wmi sparse_keymap microcode k10temp r8169 uvcvideo videobuf2_vmalloc mii videobuf2_memops videobuf2_core videodev media snd_hda_codec_realtek sp5100_tco snd_hda_codec_hdmi btusb bcma bluetooth snd_hda_intel i2c_piix4 snd_hda_codec snd_hwdep rfkill snd_seq snd_seq_device snd_pcm snd_page_alloc snd_timer snd soundcore vhost_net tun macvtap macvlan kvm_amd kvm binfmt_misc uinput btrfs libcrc32c zlib_deflate radeon i2c_algo_bit drm_kms_helper ttm drm i2c_core video wmi Pid: 234, comm: btrfs-endio-wri Not tainted 3.7.1-2.fc18.x86_64 #1 Call Trace: [<ffffffff8105e70f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff8105e76a>] warn_slowpath_null+0x1a/0x20 [<ffffffffa01b5ee3>] __btrfs_free_extent+0x833/0x870 [btrfs] [<ffffffffa01ba349>] run_clustered_refs+0x459/0xb10 [btrfs] [<ffffffffa020b663>] ? find_ref_head+0x83/0xf0 [btrfs] [<ffffffffa01bd6e8>] btrfs_run_delayed_refs+0xc8/0x2f0 [btrfs] [<ffffffffa01a866d>] ? btrfs_put_tree_mod_seq+0xdd/0x120 [btrfs] [<ffffffffa01cd8be>] __btrfs_end_transaction+0xee/0x3f0 [btrfs] [<ffffffffa01cdc10>] btrfs_end_transaction+0x10/0x20 [btrfs] [<ffffffffa01d5f9c>] btrfs_finish_ordered_io+0xcc/0x440 [btrfs] [<ffffffffa01f5516>] ? worker_loop+0x176/0x580 [btrfs] [<ffffffffa01d6325>] finish_ordered_fn+0x15/0x20 [btrfs] [<ffffffffa01f54d6>] worker_loop+0x136/0x580 [btrfs] [<ffffffffa01f53a0>] ? btrfs_queue_worker+0x300/0x300 [btrfs] [<ffffffff81081d50>] kthread+0xc0/0xd0 [<ffffffff81010000>] ? ftrace_raw_event_xen_mmu_flush_tlb_others+0x50/0xe0 [<ffffffff81081c90>] ? kthread_create_on_node+0x120/0x120 [<ffffffff8163d92c>] ret_from_fork+0x7c/0xb0 [<ffffffff81081c90>] ? kthread_create_on_node+0x120/0x120
This is probably corruption, please make sure you are running btrfs-progs from git.kernel.org and then run btrfsck on your device. If it complains run btrfsck --repair on the device and see if that fixes the problem. If not please file a bugzilla at bugzilla.kernel.org and set the component to btrfs.