[PATCH v4 3/6] kasan: print timer and workqueue stack

From: Walter Wu <walter-zh.wu@mediatek.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Marco Elver <elver@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	wsd_upstream <wsd_upstream@mediatek.com>,
	<linux-mediatek@lists.infradead.org>,
	Walter Wu <walter-zh.wu@mediatek.com>
Subject: [PATCH v4 3/6] kasan: print timer and workqueue stack
Date: Thu, 24 Sep 2020 12:05:13 +0800	[thread overview]
Message-ID: <20200924040513.31051-1-walter-zh.wu@mediatek.com> (raw)

The aux_stack[2] is reused to record the call_rcu() call stack,
timer init 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.

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Suggested-by: Marco Elver <elver@google.com>
Acked-by: Marco Elver <elver@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
---

v2:
- Thanks for Marco suggestion.
- We modify aux stack title name in KASAN report
  in order to print call_rcu()/timer/workqueue stack.

---
 mm/kasan/report.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 4f49fa6cd1aa..886809d0a8dd 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -183,12 +183,12 @@ static void describe_object(struct kmem_cache *cache, void *object,
 
 #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");
 		}
-- 
2.18.0
