------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.31/fs/quota/dquot.c:964 dquot_claim_space+0x84/0x130()
Hardware name: System Product Name
Modules linked in: xt_multiport bridge stp bnep quota_v1 snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_usb_audio snd_pcm_oss snd_usb_lib snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_seq_midi_event snd_seq snd_timer snd_rawmidi snd_hwdep iptable_filter snd_seq_device gspca_sonixb ip_tables snd gspca_main x_tables soundcore videodev nvidia(P) ppdev snd_page_alloc k8temp v4l1_compat i2c_nforce2 agpgart btusb lp parport_pc psmouse serio_raw asus_atk0110 parport binfmt_misc 8139too 8139cp mii forcedeth floppy
Pid: 32, comm: pdflush Tainted: P        W  2.6.31-13-generic #44-Ubuntu
Call Trace:
 [<c014085d>] warn_slowpath_common+0x6d/0xa0
 [<c0220ec4>] ? dquot_claim_space+0x84/0x130
 [<c0220ec4>] ? dquot_claim_space+0x84/0x130
 [<c01408a5>] warn_slowpath_null+0x15/0x20
 [<c0220ec4>] dquot_claim_space+0x84/0x130
 [<c0286cb3>] ext4_mb_mark_diskspace_used+0x363/0x3b0
 [<c0280a5e>] ? ext4_mb_use_preallocated+0x21e/0x230
 [<c0286ffe>] ext4_mb_new_blocks+0x2fe/0x570
 [<c027d00f>] ? ext4_ext_find_extent+0xff/0x280
 [<c027f01a>] ext4_ext_get_blocks+0x44a/0x540
 [<c0260b36>] ext4_get_blocks+0x1d6/0x200
 [<c02610b4>] mpage_da_map_blocks+0x94/0x400
 [<c026166e>] ext4_da_writepages+0x24e/0x490
 [<c01b5c41>] do_writepages+0x21/0x40
 [<c01feb0e>] writeback_single_inode+0x16e/0x3d0
 [<c01ff20d>] generic_sync_sb_inodes+0x38d/0x4a0
 [<c01ff3fd>] writeback_inodes+0x4d/0xe0
 [<c01b4b22>] wb_kupdate+0xa2/0x110
 [<c01b6317>] __pdflush+0xf7/0x1f0
 [<c01b6410>] ? pdflush+0x0/0x40
 [<c01b6410>] ? pdflush+0x0/0x40
 [<c01b6449>] pdflush+0x39/0x40
 [<c01b4a80>] ? wb_kupdate+0x0/0x110
 [<c015767c>] kthread+0x7c/0x90
 [<c0157600>] ? kthread+0x0/0x90
 [<c0103f17>] kernel_thread_helper+0x7/0x10
---[ end trace 5f0283f929dc7250 ]---