Description of problem:


Additional info:
WARNING: at fs/btrfs/tree-log.c:3716 btrfs_log_inode_parent+0x3f8/0x450 [btrfs]()
Hardware name: MS-7596
Modules linked in: iptable_raw xt_CT nf_conntrack bridge stp llc f71882fg hwmon_vid snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm vhost_net tun macvtap sp5100_tco macvlan i2c_piix4 kvm_amd snd_page_alloc snd_timer snd kvm edac_core edac_mce_amd serio_raw ppdev soundcore k10temp shpchp microcode parport_pc parport binfmt_misc nfsd auth_rpcgss nfs_acl lockd uinput radeon i2c_algo_bit ata_generic btrfs drm_kms_helper ttm pata_acpi libcrc32c zlib_deflate drm r8169 pata_atiixp i2c_core mii wmi sunrpc
Pid: 1355, comm: nfsd Not tainted 3.7.2-204.fc18.x86_64 #1
Call Trace:
 [<ffffffff8105e67f>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff8105e6da>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa0231e48>] btrfs_log_inode_parent+0x3f8/0x450 [btrfs]
 [<ffffffffa0231ee7>] btrfs_log_dentry_safe+0x47/0x70 [btrfs]
 [<ffffffffa020a3fa>] btrfs_sync_file+0x15a/0x220 [btrfs]
 [<ffffffff811c298d>] generic_write_sync+0x4d/0x60
 [<ffffffffa020b9c6>] btrfs_file_aio_write+0x2d6/0x4a0 [btrfs]
 [<ffffffff81635775>] ? _raw_spin_unlock_bh+0x15/0x20
 [<ffffffffa020b6f0>] ? __btrfs_buffered_write+0x350/0x350 [btrfs]
 [<ffffffff81195693>] do_sync_readv_writev+0xa3/0xe0
 [<ffffffff81195974>] do_readv_writev+0xd4/0x1e0
 [<ffffffff8117fe01>] ? kmem_cache_alloc+0x31/0x160
 [<ffffffff81195ab5>] vfs_writev+0x35/0x60
 [<ffffffffa0137ad4>] nfsd_vfs_write.isra.12+0xe4/0x3f0 [nfsd]
 [<ffffffffa0151c19>] ? find_confirmed_client+0xa9/0xf0 [nfsd]
 [<ffffffffa0151d4e>] ? nfsd4_lookup_stateid+0xee/0x140 [nfsd]
 [<ffffffffa013a1c2>] nfsd_write+0xa2/0x110 [nfsd]
 [<ffffffffa0145200>] nfsd4_write+0x110/0x130 [nfsd]
 [<ffffffffa0145e0f>] nfsd4_proc_compound+0x56f/0x780 [nfsd]
 [<ffffffffa0133b4b>] nfsd_dispatch+0xeb/0x230 [nfsd]
 [<ffffffffa000f578>] svc_process_common+0x328/0x6d0 [sunrpc]
 [<ffffffffa0133060>] ? nfsd_get_default_max_blksize+0x60/0x60 [nfsd]
 [<ffffffffa000fc72>] svc_process+0x102/0x150 [sunrpc]
 [<ffffffffa013310f>] nfsd+0xaf/0x150 [nfsd]
 [<ffffffff81081c80>] kthread+0xc0/0xd0
 [<ffffffff81010000>] ? ftrace_raw_event_xen_mmu_flush_tlb_others+0x50/0xe0
 [<ffffffff81081bc0>] ? kthread_create_on_node+0x120/0x120
 [<ffffffff8163de2c>] ret_from_fork+0x7c/0xb0
 [<ffffffff81081bc0>] ? kthread_create_on_node+0x120/0x120