diff --git a/llkd/README.md b/llkd/README.md
index 1f69718..e5be850 100644
--- a/llkd/README.md
+++ b/llkd/README.md
@@ -127,7 +127,7 @@
 default 2 minutes samples of threads for D or Z.
 
 #### ro.llk.stack
-default *empty* or false, comma separated list of kernel symbols.
+default cma_alloc,__get_user_pages, comma separated list of kernel symbols.
 The string "*false*" is the equivalent to an *empty* list.
 Look for kernel stack symbols that if ever persistently present can
 indicate a subsystem is locked up.
diff --git a/llkd/include/llkd.h b/llkd/include/llkd.h
index d0188ec..c724fce 100644
--- a/llkd/include/llkd.h
+++ b/llkd/include/llkd.h
@@ -48,7 +48,7 @@
 /* LLK_CHECK_MS_DEFAULT = actual timeout_ms / LLK_CHECKS_PER_TIMEOUT_DEFAULT */
 #define LLK_CHECKS_PER_TIMEOUT_DEFAULT 5
 #define LLK_CHECK_STACK_PROPERTY       "ro.llk.stack"
-#define LLK_CHECK_STACK_DEFAULT        ""
+#define LLK_CHECK_STACK_DEFAULT        "cma_alloc,__get_user_pages"
 #define LLK_BLACKLIST_PROCESS_PROPERTY "ro.llk.blacklist.process"
 #define LLK_BLACKLIST_PROCESS_DEFAULT  \
     "0,1,2,init,[kthreadd],[khungtaskd],lmkd,lmkd.llkd,llkd,watchdogd,[watchdogd],[watchdogd/0]"