From: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Subject: kasan: print workqueue stack The aux_stack[2] is reused to record the call_rcu() call stack and enqueuing work call stacks. So that we need to change the auxiliary stack title for common title, print them in KASAN report. Link: https://lkml.kernel.org/r/20201203022715.30635-1-walter-zh.wu@xxxxxxxxxxxx Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx> Suggested-by: Marco Elver <elver@xxxxxxxxxx> Acked-by: Marco Elver <elver@xxxxxxxxxx> Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx> Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx> Cc: Tejun Heo <tj@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/kasan/generic.c | 3 --- mm/kasan/report.c | 4 ++-- 2 files changed, 2 insertions(+), 5 deletions(-) --- a/mm/kasan/generic.c~kasan-print-workqueue-stack +++ a/mm/kasan/generic.c @@ -339,9 +339,6 @@ void kasan_record_aux_stack(void *addr) object = nearest_obj(cache, page, addr); alloc_info = get_alloc_info(cache, object); - /* - * record the last two call_rcu() call stacks. - */ alloc_info->aux_stack[1] = alloc_info->aux_stack[0]; alloc_info->aux_stack[0] = kasan_save_stack(GFP_NOWAIT); } --- a/mm/kasan/report.c~kasan-print-workqueue-stack +++ a/mm/kasan/report.c @@ -185,12 +185,12 @@ static void describe_object(struct kmem_ #ifdef CONFIG_KASAN_GENERIC if (alloc_info->aux_stack[0]) { - pr_err("Last call_rcu():\n"); + pr_err("Last potentially related work creation:\n"); print_stack(alloc_info->aux_stack[0]); pr_err("\n"); } if (alloc_info->aux_stack[1]) { - pr_err("Second to last call_rcu():\n"); + pr_err("Second to last potentially related work creation:\n"); print_stack(alloc_info->aux_stack[1]); pr_err("\n"); } _
