Subject: Re: [PATCH linux-next v5] mlx5: wrong page mask if CONFIG_ARCH_DMA_ADDR_T_64BIT enabled for 32Bit architectures

From: Eli Cohen <[email-masked]>
Date: Mon, 20 Apr 2015 10:48:48 +0300

On Wed, Apr 15, 2015 at 04:36:15PM +0800, Honggang Li wrote:
> If CONFIG_ARCH_DMA_ADDR_T_64BIT enabled for x86 systems and physical
> memory is more than 4GB, dma_map_page may return a valid memory
> address which greater than 0xffffffff. As a result, the mlx5 device page
> allocator RB tree will be initialized with valid addresses greater than
> 0xfffffff.
> 
> However, (addr & PAGE_MASK) set the high four bytes to zeros. So, it's
> impossible for the function, free_4k, to release the pages whose
> addresses greater than 4GB. Memory leaks. And mlx5_ib module can't
> release the pages when user try to remove the module, as a result,
> system hang.
> 
> [root@rdma05 root]# dmesg  | grep addr | head
> addr             = 3fe384000
> addr & PAGE_MASK =  fe384000
> [root@rdma05 root]# rmmod mlx5_ib   <---- hang on
> 
> ---------------------- cosnole log -----------------
> mlx5_ib 0000:04:00.0: irq 138 for MSI/MSI-X
>   alloc irq_desc for 139 on node -1
>   alloc kstat_irqs on node -1
> mlx5_ib 0000:04:00.0: irq 139 for MSI/MSI-X
> 0000:04:00.0:free_4k:221:(pid 1519): page not found
> 0000:04:00.0:free_4k:221:(pid 1519): page not found
> 0000:04:00.0:free_4k:221:(pid 1519): page not found
> 0000:04:00.0:free_4k:221:(pid 1519): page not found
> ---------------------- cosnole log -----------------
> 
> Fixes: bf0bf77f6519 ('mlx5: Support communicating arbitrary host page size to firmware')
> Signed-off-by: Honggang Li <[email-masked]>
> ---

Acked-by: Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/[email-masked]>
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