XFS assertion failed: tp->t_blk_res_used <= tp->t_blk_res, file: xfs_trans.c, line: 335
kernel BUG at debug.c:48!

Entering kdb (current=0xc7f98000, pid 6) Oops: invalid operand
due to oops @ 0xc8868c2d
eax = 0x0000001a ebx = 0xc5c877e0 ecx = 0x00000001 edx = 0x00000001
esi = 0xffffffff edi = 0xc7f99ba0 esp = 0xc7f99970 eip = 0xc8868c2d
ebp = 0xc7f9997c xss = 0x00000018 xcs = 0x00000010 eflags = 0x00010282
xds = 0x00000018 xes = 0x00000018 origeax = 0xffffffff &regs = 0xc7f9993c
kdb> bt
    EBP       EIP         Function(args)
0xc7f9997c 0xc8868c2d [xfs_support]assfail+0x2d (0xc8914860, 0xc89146a8, 0x14f)
                               xfs_support .text 0xc886860 0xc8868c00 0xc8868c34
0xc7f99998 0xc88dff36 [xfs]xfs_trans_mod_sb+0x142 (0xc5c877e0, 0x4, 0xffffffff)
                               xfs .text 0xc886e060 0xc88dfdf4 0xc88e0090
0xc7f999b4 0xc8883a70 [xfs]xfs_alloc_ag_vextent+0x278 (0xc7f99ba0)
                               xfs .text 0xc886e060 0xc88837f8 0xc8883a8c
0xc7f999e0 0xc8886581 [xfs]xfs_alloc_vextent+0x3c1 (0xc7f99ba0)
                               xfs .text 0xc886e060 0xc88861c0 0xc88866ac
0xc7f99bf0 0xc889693c [xfs]xfs_bmap_alloc+0x1930 (0xc7f99d20)
                               xfs .text 0xc886e060 0xc889500c 0xc8896c0c
0xc7f99d6c 0xc889ac00 [xfs]xfs_bmapi+0x884 (0xc5c877e0, 0xc067e900, 0x0, 0x0, 0x1)
                               xfs .text 0xc886e060 0xc889a37c 0xc889bd28
0xc7f99eac 0xc88f721d [xfs]xfs_strategy+0x729 (0xc067e918, 0x0, 0x0, 0x1000, 0x10002)
                               xfs .text 0xc886e060 0xc88f6af4 0xc88f7668
0xc7f99ee0 0xc88f4f53 [xfs]linvfs_pb_bmap+0x63 (0xc1873260, 0x0, 0x0, 0x1000, 0xc7f99f20)
                               xfs .text 0xc886e060 0xc88f4ef0 0xc88f4f60
0xc7f99f3c 0xc88634a8 [pagebuf]pagebuf_delalloc_convert+0x44 (0xc1873260, 0xc11dc274, 0x10002, 0xc88f4ef0)
                               pagebuf .text 0xc885f060 0xc8863464 0xc8863550
0xc7f99f80 0xc886237c [pagebuf]pagebuf_write_full_page+0x6c (0xc11dc274, 0xc88f4ef0)
                               pagebuf .text 0xc885f060 0xc8862310 0xc8862458
0xc7f99f90 0xc88f5121 [xfs]linvfs_write_full_page_nounlock+0x11 (0xc11dc274)
                               xfs .text 0xc886e060 0xc88f5110 0xc88f5130
0xc7f99fa0 0xc012f71c _write_buffer+0x7c (0xc646c4e0)
                               kernel .text 0xc0100000 0xc012f6a0 0xc012f770
0xc7f99fc8 0xc01325ab flush_dirty_buffers+0xb3 (0x1)
                               kernel .text 0xc0100000 0xc01324f8 0xc01325ec
0xc7f99fd4 0xc0132633 sync_old_buffers+0x1b (0x10f00)
                               kernel .text 0xc0100000 0xc0132618 0xc0132658
0xc7f99fec 0xc01328fc kupdate+0xf0
                               kernel .text 0xc0100000 0xc013280c 0xc0132910
           0xc0105493 kernel_thread+0x23
	                       kernel .text 0xc0100000 0xc0105470 0xc01054a8