BUG: spinlock lockup, async_umap_flush_lock in 3.4, 3.7, 3.8

I've got several systems with similar hardware which crash with BUG: spinlock errors on async_umap_flush_lock such as: BUG: spinlock lockup suspected on CPU#0, sh/1166 lock: async_umap_flush_lock+0x0/0x20, .magic: dead4ead, .owner: swapper/23/0, .owner_cpu: 23 BUG: spinlock lockup suspected on

BUG: spinlock lockup, async_umap_flush_lock in 3.4, 3.7, 3.8

I've got several systems with similar hardware which crash with BUG: spinlock errors on async_umap_flush_lock such as: BUG: spinlock lockup suspected on CPU#0, sh/1166 lock: async_umap_flush_lock+0x0/0x20, .magic: dead4ead, .owner: swapper/23/0, .owner_cpu: 23 BUG: spinlock lockup suspected on