tracing: Warn on output if the function tracer was found corrupted

As the function tracer is very intrusive, lots of self checks are
performed on the tracer and if something is found to be strange
it will shut itself down keeping it from corrupting the rest of the
kernel. This shutdown may still allow functions to be traced, as the
tracing only stops new modifications from happening. Trying to stop
the function tracer itself can cause more harm as it requires code
modification.

Although a WARN_ON() is executed, a user may not notice it. To help
the user see that something isn't right with the tracing of the system
a big warning is added to the output of the tracer that lets the user
know that their data may be incomplete.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index c3e4575e7829e1e807652ff2bc86fd0220d1a8a8..077d85387908812fc699e98b1c4d8fc6362ff6b9 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3862,6 +3862,14 @@ void ftrace_kill(void)
        clear_ftrace_function();
 }
 
+/**
+ * Test if ftrace is dead or not.
+ */
+int ftrace_is_dead(void)
+{
+       return ftrace_disabled;
+}
+
 /**
  * register_ftrace_function - register a function for profiling
  * @ops - ops structure that holds the function for profiling.

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4b8df0dc9358b70d3f20d1bccca179c0ff635f80..13f2b8472fed2a3b1a52d53adba43c33bb889cc5 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2160,6 +2160,14 @@ void trace_default_header(struct seq_file *m)
        }
 }
 
+static void test_ftrace_alive(struct seq_file *m)
+{
+       if (!ftrace_is_dead())
+               return;
+       seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n");
+       seq_printf(m, "#          MAY BE MISSING FUNCTION EVENTS\n");
+}
+
 static int s_show(struct seq_file *m, void *v)
 {
        struct trace_iterator *iter = v;
@@ -2169,6 +2177,7 @@ static int s_show(struct seq_file *m, void *v)
                if (iter->tr) {
                        seq_printf(m, "# tracer: %s\n", iter->trace->name);
                        seq_puts(m, "#\n");
+                       test_ftrace_alive(m);
                }
                if (iter->trace && iter->trace->print_header)
                        iter->trace->print_header(m);
@@ -4613,6 +4622,12 @@ __ftrace_dump(bool disable_tracing, enum ftrace_dump_mode oops_dump_mode)
 
        tracing_off();
 
+       /* Did function tracer already get disabled? */
+       if (ftrace_is_dead()) {
+               printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n");
+               printk("#          MAY BE MISSING FUNCTION EVENTS\n");
+       }
+
        if (disable_tracing)
                ftrace_kill();
 

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4c7540ad5dcb43c2250f13b12785ff6ad5c4dd64..092e1f8d18dc88757280362b8ae77b97d890c3ad 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -579,11 +579,13 @@ static inline int ftrace_trace_task(struct task_struct *task)
 
        return test_tsk_trace_trace(task);
 }
+extern int ftrace_is_dead(void);
 #else
 static inline int ftrace_trace_task(struct task_struct *task)
 {
        return 1;
 }
+static inline int ftrace_is_dead(void) { return 0; }
 #endif
 
 /*