[<ffffffff98046490>] pipe_wait+0x70/0xc0
[<ffffffff98046ce7>] pipe_read+0x267/0x3d0
[<ffffffff9803bd86>] do_sync_read+0x96/0xe0
[<ffffffff9803c7af>] vfs_read+0x9f/0x170
[<ffffffff9803d67f>] SyS_read+0x7f/0xf0
[<ffffffff9853a85b>] system_call_fastpath+0x22/0x27
[<ffffffffffffffff>] 0xffffffffffffffff