From: Rustam Kovhaev <rkovhaev@xxxxxxxxx> 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@xxxxxxxxx Fixes: d8843922fba4 ("slab: Ignore internal flags in cache creation") Signed-off-by: Rustam Kovhaev <rkovhaev@xxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Cc: Christoph Lameter <cl@xxxxxxxxx> Cc: Pekka Enberg <penberg@xxxxxxxxxx> Cc: David Rientjes <rientjes@xxxxxxxxxx> Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Cc: Glauber Costa <glommer@xxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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 */ _
