Hi, On 02/12/14 14:41, Vikas Patil wrote: > Hi All, > > What I found is UnwrapExtMemoryCallBack() function from > eurasia_km\services4\srvkm\common\devicemem.c always calls > omap_gem_put_pages(), however just before the crash it calls > omap_gem_put_paddr() and it crashes in it due to NULL pointer > dereference of &obj->dev->struct_mutex. instead of > omap_gem_put_pages(). Does this gives any clue on what might be going > wrong? What OMAP_BO_TILED_MASK signifies? OMAP_BO_TILED_MASK tells that the buffer has been allocated with TILER. I'm not really familiar with this stuff, but I presume a matching operation is done in PVRSRVImportGEMKM(). But but... If &obj->dev->struct_mutex causes a NULL ref, it sounds to me that the memory has already been released, or somehow else a NULL has gotten into there. Even if the code would accidentally call omap_gem_put_paddr instead of omap_gem_put_pages, the struct_mutex should be fine. Tomi
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