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authorSteven Rostedt <rostedt@goodmis.org>2016-01-29 10:22:41 -0500
committerSteven Rostedt <rostedt@goodmis.org>2016-01-29 12:19:10 -0500
commit6ccd83714a009ee301b50c15f6c3a5dc1f30164c (patch)
treee9b16f16bd6558120805a2d03d2a1dd0db27d2f0 /kernel
parent92e963f50fc74041b5e9e744c330dca48e04f08d (diff)
tracing/stacktrace: Show entire trace if passed in function not found
When a max stack trace is discovered, the stack dump is saved. In order to not record the overhead of the stack tracer, the ip of the traced function is looked for within the dump. The trace is started from the location of that function. But if for some reason the ip is not found, the entire stack trace is then truncated. That's not very useful. Instead, print everything if the ip of the traced function is not found within the trace. This issue showed up on s390. Link: http://lkml.kernel.org/r/20160129102241.1b3c9c04@gandalf.local.home Fixes: 72ac426a5bb0 ("tracing: Clean up stack tracing and fix fentry updates") Cc: stable@vger.kernel.org # v4.3+ Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com> Tested-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_stack.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index dda9e6742950..202df6cffcca 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -126,6 +126,13 @@ check_stack(unsigned long ip, unsigned long *stack)
}
/*
+ * Some archs may not have the passed in ip in the dump.
+ * If that happens, we need to show everything.
+ */
+ if (i == stack_trace_max.nr_entries)
+ i = 0;
+
+ /*
* Now find where in the stack these are.
*/
x = 0;