On Fri, 13 Dec 2024 09:33:32 +0800 David Wang <00107082@xxxxxxx> wrote: > When CONFIG_MEM_ALLOC_PROFILING_DEBUG is set, kernel WARN would be > triggered when calling __alloc_tag_ref_set() during swap: > > alloc_tag was not cleared (got tag for mm/filemap.c:1951) > WARNING: CPU: 0 PID: 816 at ./include/linux/alloc_tag.h... > > Clear code tags before swap can fix the warning. And this patch also fix > a potential invalid address dereference in alloc_tag_add_check() when > CONFIG_MEM_ALLOC_PROFILING_DEBUG is set and ref->ct is CODETAG_EMPTY, > which is defined as ((void *)1). > > Signed-off-by: David Wang <00107082@xxxxxxx> > Reported-by: kernel test robot <oliver.sang@xxxxxxxxx> > Closes: https://lore.kernel.org/oe-lkp/202412112227.df61ebb-lkp@xxxxxxxxx This points at 51f43d5d82ed ("mm/codetag: swap tags when migrate pages"), which had Fixes: e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()") e0a955bf7f61 ("mm/codetag: add pgalloc_tag_copy()") had Fixes: dcfe378c81f7 ("lib: introduce support for page allocation tagging") Cc: <stable@xxxxxxxxxxxxxxx> And I'm thinking that this fix should have Fixes: 51f43d5d82ed ("mm/codetag: swap tags when migrate pages") Cc: <stable@xxxxxxxxxxxxxxx>
