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>

1 files changed, 15 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4b8df0dc935..13f2b8472fe 100644
--- 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();