Description of problem: Happened shortly after running "btrfs subvolume delete /snapshots/fedora20-20140120/ && sync". Might or might not be related. Additional info: reporter: libreport-2.1.11 WARNING: CPU: 1 PID: 249 at kernel/locking/lockdep.c:708 __lock_acquire+0x18ce/0x1c10() Modules linked in: rfcomm fuse ip6t_rpfilter ccm ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep rtsx_pci_sdmmc mmc_core snd_hda_codec_conexant snd_hda_codec_hdmi rtsx_pci_ms uvcvideo memstick videobuf2_vmalloc videobuf2_memops videobuf2_core snd_hda_intel videodev media btusb bluetooth snd_hda_codec arc4 snd_hwdep snd_seq snd_seq_device kvm k10temp rtl8192ce microcode rtl_pci joydev rtlwifi rtl8192c_common sp5100_tco serio_raw mac80211 cfg80211 i2c_piix4 thinkpad_acpi snd_pcm rtsx_pci snd_page_alloc rfkill wmi mfd_core snd_timer video shpchp snd acpi_cpufreq soundcore btrfs libcrc32c xor raid6_pq radeon i2c_algo_bit drm_kms_helper ttm atl1c drm i2c_core CPU: 1 PID: 249 Comm: btrfs-cleaner Not tainted 3.13.0-0.rc8.git4.1.fc21.x86_64 #1 Hardware name: LENOVO 30515QG/30515QG, BIOS 8RET54WW (1.17 ) 10/24/2012 0000000000000009 ffff8800c2459a30 ffffffff817656a4 0000000000000000 ffff8800c2459a68 ffffffff810789ed ffffffff825e9810 0000000000000002 ffff8800c2362d78 00017f41996f81b0 0000000000000000 ffff8800c2459a78 Call Trace: [<ffffffff817656a4>] dump_stack+0x4d/0x66 [<ffffffff810789ed>] warn_slowpath_common+0x7d/0xa0 [<ffffffff81078aca>] warn_slowpath_null+0x1a/0x20 [<ffffffff810d4c9e>] __lock_acquire+0x18ce/0x1c10 [<ffffffff811918ce>] ? release_pages+0x8e/0x220 [<ffffffff810d2f95>] ? trace_hardirqs_on_caller+0x105/0x1d0 [<ffffffff810d57d2>] lock_acquire+0xa2/0x1d0 [<ffffffffa02a5094>] ? btrfs_tree_lock+0xe4/0x220 [btrfs] [<ffffffff8176e82e>] _raw_write_lock+0x3e/0x80 [<ffffffffa02a5094>] ? btrfs_tree_lock+0xe4/0x220 [btrfs] [<ffffffffa02a5094>] btrfs_tree_lock+0xe4/0x220 [btrfs] [<ffffffffa028e73a>] ? find_extent_buffer+0xca/0x1e0 [btrfs] [<ffffffffa0257307>] do_walk_down+0xf7/0x570 [btrfs] [<ffffffff810cf81d>] ? trace_hardirqs_off+0xd/0x10 [<ffffffffa0257846>] walk_down_tree+0xc6/0x100 [btrfs] [<ffffffffa025b549>] btrfs_drop_snapshot+0x3c9/0x780 [btrfs] [<ffffffffa026f7d0>] btrfs_clean_one_deleted_snapshot+0xb0/0x110 [btrfs] [<ffffffffa0265750>] cleaner_kthread+0x140/0x1a0 [btrfs] [<ffffffffa0265610>] ? btree_releasepage+0x30/0x30 [btrfs] [<ffffffff810a443f>] kthread+0xff/0x120 [<ffffffff810a4340>] ? insert_kthread_work+0x80/0x80 [<ffffffff8177823c>] ret_from_fork+0x7c/0xb0 [<ffffffff810a4340>] ? insert_kthread_work+0x80/0x80 Potential duplicate: bug 969108
Created attachment 853898 [details] File: dmesg
This bug appears to have been reported against 'rawhide' during the Fedora 22 development cycle. Changing version to '22'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora22