Additional info:
reporter:       libreport-2.1.7
WARNING: at fs/btrfs/super.c:255 __btrfs_abort_transaction+0xcf/0xf0 [btrfs]()
Hardware name: P5K SE
Modules linked in: bnep bluetooth rfkill nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_nat nf_nat_ipv6 ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter ip6_tables snd_hda_codec_realtek acpi_cpufreq snd_hda_intel mperf coretemp snd_hda_codec snd_usb_audio kvm_intel snd_emu10k1 btrfs snd_usbmidi_lib snd_util_mem snd_ac97_codec ac97_bus snd_hwdep snd_rawmidi iTCO_wdt iTCO_vendor_support zlib_deflate snd_seq snd_seq_device kvm raid1 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media snd_pcm raid6_pq libcrc32c xor emu10k1_gp gameport microcode snd_page_alloc snd_timer snd soundcore joydev i2c_i801 atl1 lpc_ich mfd_core mii asus_atk0110 uinput ata_generic pata_acpi nouveau firewire_ohci firewire_core crc_itu_t usb_storage video mxm_wmi pata_marvell wmi i2c_algo_bit drm_kms_helper ttm drm i2c_core
Pid: 2143, comm: mount Not tainted 3.9.5-301.fc19.x86_64 #1
Call Trace:
 [<ffffffffa03cbd00>] ? __btrfs_abort_transaction+0x70/0xf0 [btrfs]
 [<ffffffff8105cc26>] warn_slowpath_common+0x66/0x80
 [<ffffffff8105cc8c>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa03cbd5f>] __btrfs_abort_transaction+0xcf/0xf0 [btrfs]
 [<ffffffffa03dc34d>] __btrfs_free_extent+0x22d/0x840 [btrfs]
 [<ffffffffa0438564>] ? btrfs_merge_delayed_refs+0x1f4/0x3d0 [btrfs]
 [<ffffffffa03e048d>] run_clustered_refs+0x60d/0xc30 [btrfs]
 [<ffffffffa03e4b40>] btrfs_run_delayed_refs+0xd0/0x500 [btrfs]
 [<ffffffffa0413bef>] ? free_extent_buffer+0x4f/0xa0 [btrfs]
 [<ffffffffa03e50de>] btrfs_write_dirty_block_groups+0x16e/0x610 [btrfs]
 [<ffffffffa03f325c>] commit_cowonly_roots+0x16c/0x260 [btrfs]
 [<ffffffffa03f501d>] btrfs_commit_transaction+0x56d/0xa80 [btrfs]
 [<ffffffff81080fa0>] ? wake_up_bit+0x30/0x30
 [<ffffffff8118064c>] ? kmem_cache_free+0x20c/0x220
 [<ffffffffa0430502>] btrfs_recover_log_trees+0x312/0x360 [btrfs]
 [<ffffffffa042dfa0>] ? replay_one_extent+0x690/0x690 [btrfs]
 [<ffffffffa03f2a1b>] open_ctree+0x18eb/0x1f90 [btrfs]
 [<ffffffff812db184>] ? disk_name+0x54/0xb0
 [<ffffffffa03cb94e>] btrfs_mount+0x5ce/0x6c0 [btrfs]
 [<ffffffff8119d5e9>] mount_fs+0x39/0x1b0
 [<ffffffff81150ef0>] ? __alloc_percpu+0x10/0x20
 [<ffffffff811b679f>] vfs_kern_mount+0x5f/0xf0
 [<ffffffff811b8a6e>] do_mount+0x23e/0xa20
 [<ffffffff8114b5eb>] ? strndup_user+0x4b/0xf0
 [<ffffffff811b92d3>] sys_mount+0x83/0xc0
 [<ffffffff8164e799>] system_call_fastpath+0x16/0x1b

Potential duplicate: bug 868749