kmemleak: Show where early_log issues come from

Based on initial patch by Steven Rostedt.

Early kmemleak warnings did not show where the actual kmemleak API had
been called from but rather just a backtrace to the kmemleak_init()
function. By having all early kmemleak logs record the stack_trace, we
can have kmemleak_init() write exactly where the problem occurred. This
patch adds the setting of the kmemleak_warning variable every time a
kmemleak warning is issued. The kmemleak_init() function checks this
variable during early log replaying and prints the log trace if there
was any warning.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 28 insertions, 9 deletions

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index f3b2a00fe9c1..8b528e3f8413 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -196,7 +196,9 @@ static atomic_t kmemleak_enabled = ATOMIC_INIT(0);
 static atomic_t kmemleak_initialized = ATOMIC_INIT(0);
 /* enables or disables early logging of the memory operations */
 static atomic_t kmemleak_early_log = ATOMIC_INIT(1);
-/* set if a fata kmemleak error has occurred */
+/* set if a kmemleak warning was issued */
+static atomic_t kmemleak_warning = ATOMIC_INIT(0);
+/* set if a fatal kmemleak error has occurred */
 static atomic_t kmemleak_error = ATOMIC_INIT(0);
 
 /* minimum and maximum address that may be valid pointers */
@@ -259,9 +261,10 @@ static void kmemleak_disable(void);
 /*
  * Print a warning and dump the stack trace.
  */
-#define kmemleak_warn(x...)     do {    \
-        pr_warning(x);                  \
-        dump_stack();                   \
+#define kmemleak_warn(x...)     do {            \
+        pr_warning(x);                          \
+        dump_stack();                           \
+        atomic_set(&kmemleak_warning, 1);       \
 } while (0)
 
 /*
@@ -403,8 +406,8 @@ static struct kmemleak_object *lookup_object(unsigned long ptr, int alias)
                 object = prio_tree_entry(node, struct kmemleak_object,
                                          tree_node);
                 if (!alias && object->pointer != ptr) {
-                        pr_warning("Found object by alias at 0x%08lx\n", ptr);
-                        dump_stack();
+                        kmemleak_warn("Found object by alias at 0x%08lx\n",
+                                      ptr);
                         dump_object_info(object);
                         object = NULL;
                 }
@@ -811,8 +814,7 @@ static void __init log_early(int op_type, const void *ptr, size_t size,
         log->ptr = ptr;
         log->size = size;
         log->min_count = min_count;
-        if (op_type == KMEMLEAK_ALLOC)
-                log->trace_len = __save_stack_trace(log->trace);
+        log->trace_len = __save_stack_trace(log->trace);
         crt_early_log++;
         local_irq_restore(flags);
 }
@@ -1659,6 +1661,17 @@ static int kmemleak_boot_config(char *str)
 }
 early_param("kmemleak", kmemleak_boot_config);
 
+static void __init print_log_trace(struct early_log *log)
+{
+        struct stack_trace trace;
+
+        trace.nr_entries = log->trace_len;
+        trace.entries = log->trace;
+
+        pr_notice("Early log backtrace:\n");
+        print_stack_trace(&trace, 2);
+}
+
 /*
  * Kmemleak initialization.
  */
@@ -1720,7 +1733,13 @@ void __init kmemleak_init(void)
                         kmemleak_no_scan(log->ptr);
                         break;
                 default:
-                        WARN_ON(1);
+                        kmemleak_warn("Unknown early log operation: %d\n",
+                                      log->op_type);
+                }
+
+                if (atomic_read(&kmemleak_warning)) {
+                        print_log_trace(log);
+                        atomic_set(&kmemleak_warning, 0);
                 }
         }
 }