[0]kdb> btp 1391
Stack traceback for pid 1391
0xce95e000     1391     1387  0    0   D  0xce95e370  umount
ESP        EIP        Function (args)
0xce95fe68 0xc0116745 schedule+0x48d
                               kernel .text 0xc0100000 0xc01162b8 0xc0116808
0xce95feac 0xc01076c5 __down+0x6d
                               kernel .text 0xc0100000 0xc0107658 0xc0107728
0xce95fecc 0xc0107874 __down_failed+0x8 (0xcdd47220, 0xd08b6366, 0xcdd47220, 0xcf693ea0, 0xcf8fd000)
                               kernel .text 0xc0100000 0xc010786c 0xc0107878
0xce95fedc 0xd08b6bba [xfs].text.lock.page_buf_locking+0xc
                               xfs .text 0xd0863060 0xd08b6bae 0xd08b6ca8
0xce95fedc 0xd08b6ca0 [xfs].text.lock.page_buf_locking+0xf2
                               xfs .text 0xd0863060 0xd08b6bae 0xd08b6ca8
0xce95fedc 0xd08b6d9a [xfs]xfs_read_xfsstats+0xf2 (0xcf8fd000, 0x0, 0x0)
                               xfs .text 0xd0863060 0xd08b6ca8 0xd08b6da0
0xce95ff38 0xd08bfa65 [xfs]vfs_unmount+0x25 (0xcf8fd000, 0x0, 0x0)
                               xfs .text 0xd0863060 0xd08bfa40 0xd08bfa6c
0xce95ff48 0xd08bf240 [xfs]linvfs_put_super+0x2c (0xcf8fd400)
                               xfs .text 0xd0863060 0xd08bf214 0xd08bf274
0xce95ff5c 0xc013fd43 kill_super+0xd7 (0xcf8fd400, 0xc130dd60, 0xcf3aa3a0)
                               kernel .text 0xc0100000 0xc013fc6c 0xc013fda4
0xce95ff74 0xc0151856 __mntput+0x1e (0xc130dd60)
                               kernel .text 0xc0100000 0xc0151838 0xc015185c
0xce95ff8c 0xc0143edc path_release+0x28 (0xce95ffa4)
                               kernel .text 0xc0100000 0xc0143eb4 0xc0143ee4
0xce95ff98 0xc015200f sys_umount+0x6f (0x8053098, 0x1, 0x80530c8, 0x8053099, 0x804f740)
                               kernel .text 0xc0100000 0xc0151fa0 0xc015201c
0xce95ffc4 0xc0108a63 system_call+0x33
                               kernel .text 0xc0100000 0xc0108a30 0xc0108a68
[0]kdb>