meta-google: linux: Add more debug features

These features ensure that the kernels we ship are more stable, and
give us early warnings when we have deadlock causing bugs.

Change-Id: I2616f5faa8f98f84c86a6e6683c8b4a322c535db
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-kernel/linux/files/gbmc-dev.cfg b/meta-google/recipes-kernel/linux/files/gbmc-dev.cfg
index d37b116..0576b44 100644
--- a/meta-google/recipes-kernel/linux/files/gbmc-dev.cfg
+++ b/meta-google/recipes-kernel/linux/files/gbmc-dev.cfg
@@ -8,6 +8,7 @@
 CONFIG_FUNCTION_GRAPH_TRACER=y
 CONFIG_STACK_TRACER=y
 CONFIG_DYNAMIC_FTRACE=y
+CONFIG_TEST_LOCKUP=y
 
 # We want to allow for sysrqs over the console
 CONFIG_MAGIC_SYSRQ=y