Re: [PATCH 2/3] slab_common: clear pointers to per memcg caches on destroy

[Andrew Morton]

On Thu, 8 Oct 2015 19:02:40 +0300 Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> wrote:

> Currently, we do not clear pointers to per memcg caches in the
> memcg_params.memcg_caches array when a global cache is destroyed with
> kmem_cache_destroy. It is fine if the global cache does get destroyed.
> However, a cache can be left on the list if it still has active objects
> when kmem_cache_destroy is called (due to a memory leak). If this
> happens, the entries in the array will point to already freed areas,
> which is likely to result in data corruption when the cache is reused
> (via slab merging).

It's important that we report these leaks so the kernel bug can get
fixed.  The patch doesn't add such detection and reporting, but it
could do so?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/