Re: [Question] A novel case happened when using mempool allocate memory.

[Matthew Wilcox]

On Wed, Aug 01, 2018 at 11:31:15PM +0800, zhong jiang wrote:
> Hi,  Everyone
> 
>  I ran across the following novel case similar to memory leak in linux-4.1 stable when allocating
>  memory object by kmem_cache_alloc.   it rarely can be reproduced.
> 
> I create a specific  mempool with 24k size based on the slab.  it can not be merged with
> other kmem cache.  I  record the allocation and free usage by atomic_add/sub.    After a while,
> I watch the specific slab consume most of total memory.   After halting the code execution.
> The counter of allocation and free is equal.  Therefore,  I am sure that module have released
> all meory resource.  but the statistic of specific slab is very high but stable by checking /proc/slabinfo.

Please post the code.