linux-kernel - Re: [PATCH] mm: kmemleak: slob: respect SLAB

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Date:   Tue, 16 Nov 2021 10:54:53 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Rustam Kovhaev <rkovhaev@...il.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag

On Mon, Nov 15, 2021 at 10:09 AM Rustam Kovhaev <rkovhaev@...il.com> wrote:
>
> When kmemleak is enabled for SLOB, system does not boot and does not
> print anything to the console. At the very early stage in the boot
> process we hit infinite recursion from kmemleak_init() and eventually
> kernel crashes.
> kmemleak_init() specifies SLAB_NOLEAKTRACE for KMEM_CACHE(), but
> kmem_cache_create_usercopy() removes it because CACHE_CREATE_MASK is not
> valid for SLOB.
> Let's fix CACHE_CREATE_MASK and make kmemleak work with SLOB
>
> Fixes: d8843922fba4 ("slab: Ignore internal flags in cache creation")
> Signed-off-by: Rustam Kovhaev <rkovhaev@...il.com>

Reviewed-by: Muchun Song <songmuchun@...edance.com>

Thanks.