dashboard无法删除云主机，指令也删不掉

[ 8641.344137] Call Trace:
[ 8641.345773]  [<ffffffff811562e0>] ? wait_on_page_read+0x60/0x60
[ 8641.347943]  [<ffffffff8160a13d>] io_schedule+0x9d/0x140
[ 8641.350015]  [<ffffffff811562ee>] sleep_on_page+0xe/0x20
[ 8641.352080]  [<ffffffff81607f00>] __wait_on_bit+0x60/0x90
[ 8641.354143]  [<ffffffff81156076>] wait_on_page_bit+0x86/0xb0
[ 8641.356238]  [<ffffffff81098390>] ? autoremove_wake_function+0x40/0x40
[ 8641.358438]  [<ffffffff811561b1>] filemap_fdatawait_range+0x111/0x1b0
[ 8641.360642]  [<ffffffffa010aec3>] ? xfs_vm_writepages+0x43/0x50 [xfs]
[ 8641.362815]  [<ffffffff81162f5e>] ? do_writepages+0x1e/0x40
[ 8641.364865]  [<ffffffff81157db5>] ? __filemap_fdatawrite_range+0x65/0x80
[ 8641.367085]  [<ffffffff81157edf>] filemap_write_and_wait_range+0x3f/0x70
[ 8641.369306]  [<ffffffffa0115746>] xfs_file_fsync+0x66/0x1f0 [xfs]
[ 8641.371399]  [<ffffffff811f7085>] do_fsync+0x65/0xa0
[ 8641.373324]  [<ffffffff811f7350>] SyS_fsync+0x10/0x20
[ 8641.375263]  [<ffffffff81614c32>] tracesys+0xdd/0xe2
[ 8761.377121] INFO: task xfsaild/vda1:278 blocked for more than 120 seconds.
[ 8761.380965] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 8761.385006] xfsaild/vda1    D ffff88013fc13680     0   278      2 0x00000000
[ 8761.388927]  ffff880034d07d40 0000000000000046 ffff880034d07fd8 0000000000013680
[ 8761.392789]  ffff880034d07fd8 0000000000013680 ffff8800350b2220 ffff8800350b2220
[ 8761.396614]  ffff88013fc14340 0000000000000001 0000000000000000 ffff8800350dd928
[ 8761.400230] Call Trace:
[ 8761.402519]  [<ffffffff81609e39>] schedule+0x29/0x70
[ 8761.405471]  [<ffffffffa016f890>] _xfs_log_force+0x230/0x290 [xfs]
[ 8761.408568]  [<ffffffff810a9620>] ? wake_up_state+0x20/0x20
[ 8761.411372]  [<ffffffffa016f916>] xfs_log_force+0x26/0x80 [xfs]
[ 8761.414282]  [<ffffffffa0174390>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]
[ 8761.417461]  [<ffffffffa01744e1>] xfsaild+0x151/0x5e0 [xfs]
[ 8761.420160]  [<ffffffffa0174390>] ? xfs_trans_ail_cursor_first+0x90/0x90 [xfs]
[ 8761.423104]  [<ffffffff8109739f>] kthread+0xcf/0xe0
[ 8761.425661]  [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140
[ 8761.428478]  [<ffffffff8161497c>] ret_from_fork+0x7c/0xb0
[ 8761.430983]  [<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140

openstack是由多个组件组成，删除的时候，一些组件或则使用的资源等都需要停掉，否则可能就删除不成功。