abrt version: 2.0.3
architecture:   x86_64
cmdline:        ro root=/dev/mapper/vg_titanium-lv_root_f15 rd_LUKS_UUID=luks-36e83e51-55ee-4463-a44c-fd037cba0b63 rd_LVM_LV=vg_titanium/lv_root_f15 rd_LVM_LV=vg_titanium/lv_swap rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=uk rhgb quiet
component:      kernel
kernel:         2.6.40.4-5.fc15.x86_64
kernel_tainted: 512
kernel_tainted_long: Taint on warning.
os_release:     Fedora release 15 (Lovelock)
package:        kernel
reason:         WARNING: at fs/btrfs/inode.c:2194 btrfs_orphan_commit_root+0x83/0xa2 [btrfs]()
time:           Mon Oct  3 22:13:03 2011

backtrace:
:WARNING: at fs/btrfs/inode.c:2194 btrfs_orphan_commit_root+0x83/0xa2 [btrfs]()
:Hardware name: 4313CTO
:Modules linked in: vfat fat mmc_block ppdev parport_pc lp parport usb_storage usblp uas gspca_zc3xx gspca_main tcp_lp fuse ebtable_nat ebtables ipt_MASQUERADE xt_CHECKSUM bridge stp llc btrfs zlib_deflate ip6table_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 iptable_mangle sunrpc cpufreq_ondemand acpi_cpufreq mperf ceph libceph libcrc32c rfcomm bnep ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables snd_hda_codec_hdmi snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer intel_ips arc4 iwlagn mac80211 i2c_i801 cfg80211 e1000e iTCO_wdt iTCO_vendor_support snd_page_alloc btusb bluetooth uvcvideo videodev media v4l2_compat_ioctl32 thinkpad_acpi rfkill snd soundcore joydev microcode virtio_net kvm_intel kvm ipv6 xts gf128mul dm_crypt firewire_ohci firewire_core crc_itu_t sdhci_pci sdhci mmc_core nouveau ttm drm_kms_helper drm i2c_algo_bit i2c_core mxm_wmi wmi video [l
:ast unloaded: scsi_wait_scan]
:Pid: 14725, comm: kworker/3:3 Not tainted 2.6.40.4-5.fc15.x86_64 #1
:Call Trace:
: [<ffffffff81054c8e>] warn_slowpath_common+0x83/0x9b
: [<ffffffff81054cc0>] warn_slowpath_null+0x1a/0x1c
: [<ffffffffa0547675>] btrfs_orphan_commit_root+0x83/0xa2 [btrfs]
: [<ffffffffa054160c>] commit_fs_roots+0xa1/0x14b [btrfs]
: [<ffffffff81041325>] ? should_resched+0xe/0x2d
: [<ffffffff81486b24>] ? _cond_resched+0xe/0x22
: [<ffffffffa05429e1>] btrfs_commit_transaction+0x3e0/0x706 [btrfs]
: [<ffffffff81070566>] ? remove_wait_queue+0x3a/0x3a
: [<ffffffff8104522f>] ? finish_task_switch+0x49/0xb7
: [<ffffffffa0542d07>] ? btrfs_commit_transaction+0x706/0x706 [btrfs]
: [<ffffffffa0542d22>] do_async_commit+0x1b/0x28 [btrfs]
: [<ffffffff8106be6c>] process_one_work+0x176/0x2a9
: [<ffffffff8106ca05>] worker_thread+0xda/0x15d
: [<ffffffff8106c92b>] ? manage_workers+0x175/0x175
: [<ffffffff8106c92b>] ? manage_workers+0x175/0x175
: [<ffffffff8106fe77>] kthread+0x84/0x8c
: [<ffffffff8148f964>] kernel_thread_helper+0x4/0x10
: [<ffffffff8106fdf3>] ? kthread_worker_fn+0x148/0x148
: [<ffffffff8148f960>] ? gs_change+0x13/0x13

comment:
:no idea
:
:

event_log:
:2011-10-05-20:19:02> Error sending kernel oops due to missing backtrace
:2011-10-05-20:19:02* (exited with 1)
:2011-10-05-20:19:02> Essential file 'duphash' is missing, can't continue..
:2011-10-05-20:19:02* (exited with 1)