This is a note to let you know that I've just added the patch titled mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mm-kmemleak-slob-respect-slab_noleaktrace-flag.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 34dbc3aaf5d9e89ba6cc5e24add9458c21ab1950 Mon Sep 17 00:00:00 2001 From: Rustam Kovhaev <rkovhaev@xxxxxxxxx> Date: Fri, 19 Nov 2021 16:43:37 -0800 Subject: mm: kmemleak: slob: respect SLAB_NOLEAKTRACE flag From: Rustam Kovhaev <rkovhaev@xxxxxxxxx> commit 34dbc3aaf5d9e89ba6cc5e24add9458c21ab1950 upstream. 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> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/slab.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/slab.h +++ b/mm/slab.h @@ -211,7 +211,7 @@ 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 */ Patches currently in stable-queue which might be from rkovhaev@xxxxxxxxx are queue-5.4/mm-kmemleak-slob-respect-slab_noleaktrace-flag.patch