From: Rustam Kovhaev rkovhaev@gmail.com Subject: mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag

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

Link: https://lkml.kernel.org/r/20211115020850.3154366-1-rkovhaev@gmail.com Fixes: d8843922fba4 ("slab: Ignore internal flags in cache creation") Signed-off-by: Rustam Kovhaev rkovhaev@gmail.com Acked-by: Vlastimil Babka vbabka@suse.cz Reviewed-by: Muchun Song songmuchun@bytedance.com Cc: Christoph Lameter cl@linux.com Cc: Pekka Enberg penberg@kernel.org Cc: David Rientjes rientjes@google.com Cc: Joonsoo Kim iamjoonsoo.kim@lge.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Glauber Costa glommer@parallels.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/slab.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/slab.h~mm-kmemleak-slob-respect-slab_noleaktrace-flag +++ a/mm/slab.h @@ -147,7 +147,7 @@ static inline slab_flags_t kmem_cache_fl #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ SLAB_TEMPORARY | SLAB_ACCOUNT) #else -#define SLAB_CACHE_FLAGS (0) +#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE) #endif

/* Common flags available with current configuration */ _