Dear list members, While I was defragging my file system, the following warning showed up in the dmesg: [ 6323.296521] ------------[ cut here ]------------ [ 6323.296551] WARNING: CPU: 5 PID: 13598 at /home/abuild/rpmbuild/BUILD/kernel- desktop-3.12.0/linux-3.12/fs/btrfs/backref.c:934 find_parent_nodes+0xe64/0xe70 [btrfs]() [ 6323.296552] Modules linked in: bnep bluetooth rfkill nvidia(PO) drm xt_tcpudp xt_pkttype xt_LOG xt_limit af_packet ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT ipt able_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables fuse snd_hda_codec_hdmi coretemp gpio_ich mxm_wmi iTCO_wdt i TCO_vendor_support kvm_intel usb_storage kvm snd_hda_codec_realtek sr_mod pcspkr snd_hda_intel serio_raw snd_hda_codec cdrom r8169 mii acpi_cpufreq wmi snd_seq snd_hwdep snd_seq_device snd_pcm button snd_time r lpc_ich i7core_edac mfd_core i2c_i801 snd edac_core soundcore snd_page_alloc shpchp sg nf_conntrack ip_tables x_tables dm_mod autofs4 btrfs raid6_pq xor libcrc32c crc32c_intel hid_logitech_dj [ 6323.296580] processor thermal_sys scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua scsi_dh ata_generic ata_piix [last unloaded: drm] [ 6323.296588] CPU: 5 PID: 13598 Comm: btrfs-endio-wri Tainted: P O 3.12.0-6.ge7c00d8-desktop #1 [ 6323.296589] Hardware name: MSI MS-7522/MSI X58 Pro-E (MS-7522), BIOS V8.15 03/19/2011 [ 6323.296591] 0000000000000009 ffffffff815bd494 0000000000000000 ffffffff810521d2 [ 6323.296594] ffff880109231ba8 ffff88014d51d6e0 0000000000000000 ffff880000000000 [ 6323.296596] ffff88016d5a1640 ffffffffa01100b4 ffffffff00000001 ffff880100000050 [ 6323.296598] Call Trace: [ 6323.296610] [<ffffffff81004a28>] dump_trace+0x88/0x310 [ 6323.296613] [<ffffffff81004d80>] show_stack_log_lvl+0xd0/0x1d0 [ 6323.296616] [<ffffffff810061cc>] show_stack+0x1c/0x50 [ 6323.296621] [<ffffffff815bd494>] dump_stack+0x50/0x89 [ 6323.296628] [<ffffffff810521d2>] warn_slowpath_common+0x72/0x90 [ 6323.296643] [<ffffffffa01100b4>] find_parent_nodes+0xe64/0xe70 [btrfs] [ 6323.296749] [<ffffffffa0110a96>] iterate_extent_inodes+0xf6/0x320 [btrfs] [ 6323.296820] [<ffffffffa0110d44>] iterate_inodes_from_logical+0x84/0xa0 [btrfs] [ 6323.296887] [<ffffffffa00b820b>] record_extent_backrefs+0x6b/0xe0 [btrfs] [ 6323.296920] [<ffffffffa00c25b0>] btrfs_finish_ordered_io+0x1d0/0xad0 [btrfs] [ 6323.297008] [<ffffffffa00e43d9>] worker_loop+0x149/0x550 [btrfs] [ 6323.297065] [<ffffffff8107355f>] kthread+0xaf/0xc0 [ 6323.297071] [<ffffffff815caf8c>] ret_from_fork+0x7c/0xb0 [ 6323.297074] ---[ end trace f4f4fc91916d37a0 ]--- Versions: - OS: openSUSE 13.1 - Kernel: Linux linux-suse 3.12.0-6.ge7c00d8-desktop #1 SMP PREEMPT Tue Nov 12 13:09:24 UTC 2013 (e7c00d8) x86_64 x86_64 x86_64 GNU/Linux - btrfs: Btrfs v0.20-rc1 - Ran command: ./btrfs fi defrag -clzo -r -v /usr/ Ákos -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html