Mar 15 11:50:16 plana12 kernel: [ 9708.938042] ------------[ cut here ]------------
Mar 15 11:50:16 plana12 kernel: [ 9708.938052] WARNING: at /srv/autobuild-ceph/gitbuilder.git/build/kernel/lockdep.c:703 register_lock_class+0xf0/0x4b0()
Mar 15 11:50:16 plana12 kernel: [ 9708.938055] Hardware name: PowerEdge R410
Mar 15 11:50:16 plana12 kernel: [ 9708.938056] Modules linked in: xfs exportfs ipmi_devintf ipmi_si ipmi_msghandler i7core_edac edac_core joydev psmouse serio_raw dcdbas hed lp parport usbhid hid mptsas mptscsih mptbase ixgbe dca scsi_transport_sas mdio bnx2 btrfs zlib_deflate crc32c libcrc32c
Mar 15 11:50:16 plana12 kernel: [ 9708.938079] Pid: 3397, comm: btrfs-cleaner Not tainted 3.2.0-ceph-00182-g147ad9e #1
Mar 15 11:50:16 plana12 kernel: [ 9708.938081] Call Trace:
Mar 15 11:50:16 plana12 kernel: [ 9708.938086]  [<ffffffff810634af>] warn_slowpath_common+0x7f/0xc0
Mar 15 11:50:16 plana12 kernel: [ 9708.938089]  [<ffffffff8106350a>] warn_slowpath_null+0x1a/0x20
Mar 15 11:50:16 plana12 kernel: [ 9708.938092]  [<ffffffff8109cd60>] register_lock_class+0xf0/0x4b0
Mar 15 11:50:16 plana12 kernel: [ 9708.938095]  [<ffffffff8109f5b9>] __lock_acquire+0x99/0x15d0
Mar 15 11:50:16 plana12 kernel: [ 9708.938098]  [<ffffffff8109f730>] ? __lock_acquire+0x210/0x15d0
Mar 15 11:50:16 plana12 kernel: [ 9708.938117]  [<ffffffffa006ed71>] ? btrfs_tree_lock+0x131/0x290 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938119]  [<ffffffff810a10e2>] lock_acquire+0xa2/0x120
Mar 15 11:50:16 plana12 kernel: [ 9708.938132]  [<ffffffffa006ed71>] ? btrfs_tree_lock+0x131/0x290 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938137]  [<ffffffff81605b31>] _raw_write_lock+0x31/0x40
Mar 15 11:50:16 plana12 kernel: [ 9708.938149]  [<ffffffffa006ed71>] ? btrfs_tree_lock+0x131/0x290 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938162]  [<ffffffffa006ed71>] btrfs_tree_lock+0x131/0x290 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938175]  [<ffffffffa0058a6f>] ? find_extent_buffer+0x8f/0xe0 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938187]  [<ffffffffa00589e0>] ? extent_io_exit+0x150/0x150 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938197]  [<ffffffffa002765c>] do_walk_down+0xdc/0x4e0 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938206]  [<ffffffffa0021c2a>] ? btrfs_block_rsv_check+0x3a/0x90 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938211]  [<ffffffff8131c064>] ? do_raw_spin_lock+0x54/0x120
Mar 15 11:50:16 plana12 kernel: [ 9708.938221]  [<ffffffffa0029103>] walk_down_tree+0xc3/0x100 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938231]  [<ffffffffa002ed49>] btrfs_drop_snapshot+0x2d9/0x5b0 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938234]  [<ffffffff8131bfbe>] ? do_raw_spin_unlock+0x5e/0xb0
Mar 15 11:50:16 plana12 kernel: [ 9708.938245]  [<ffffffffa003af64>] btrfs_clean_old_snapshots+0x114/0x150 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938256]  [<ffffffffa0035e0c>] ? cleaner_kthread+0x14c/0x1a0 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938267]  [<ffffffffa0035e20>] cleaner_kthread+0x160/0x1a0 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938278]  [<ffffffffa0035cc0>] ? transaction_kthread+0x290/0x290 [btrfs]
Mar 15 11:50:16 plana12 kernel: [ 9708.938282]  [<ffffffff810871e6>] kthread+0xb6/0xc0
Mar 15 11:50:16 plana12 kernel: [ 9708.938286]  [<ffffffff8109f1a5>] ? trace_hardirqs_on_caller+0x105/0x190
Mar 15 11:50:16 plana12 kernel: [ 9708.938290]  [<ffffffff81610384>] kernel_thread_helper+0x4/0x10
Mar 15 11:50:16 plana12 kernel: [ 9708.938293]  [<ffffffff81606274>] ? retint_restore_args+0x13/0x13
Mar 15 11:50:16 plana12 kernel: [ 9708.938297]  [<ffffffff81087130>] ? __init_kthread_worker+0x70/0x70
Mar 15 11:50:16 plana12 kernel: [ 9708.938300]  [<ffffffff81610380>] ? gs_change+0x13/0x13
Mar 15 11:50:16 plana12 kernel: [ 9708.938302] ---[ end trace a4327123c502e41d ]---