System Environment:
--------------------------

--Platform:bearlake

--Architecture(32-bit,64-bit,compatiblity):64bit 

--2D driver:
commit f69b48fe24ef94dac44b8123884ca71df675be4b

--3D driver:
commit 8aa0fd6b206930ababb1bae2acc629e2a945c0c0

--Xserver:
commit 7ef7727b800fa4715b80a82850d65b88fde5fe6c


--Kernel:
2.6.24-rc5


Bug detailed description:
-------------------------
startx ,run manywin 10 , run failed and print "manywin: ../common/dri_bufmgr_fake.c:561: dri_bufmgr_fake_contended_lock_take: Assertion `((&bufmgr_fake->on_hardware)->next == (&bufmgr_fake->on_hardware))' failed.
Aborted "



Reproduce steps:
----------------
 run manywin 10 



Current result:
----------------
abort .


Expected result:
----------------
run normally