diff --git a/libc/bionic/fdsan.cpp b/libc/bionic/fdsan.cpp
index df369cc..1ace9b6 100644
--- a/libc/bionic/fdsan.cpp
+++ b/libc/bionic/fdsan.cpp
@@ -30,6 +30,7 @@
 
 #include <errno.h>
 #include <inttypes.h>
+#include <signal.h>
 #include <stdarg.h>
 #include <stdatomic.h>
 #include <string.h>
@@ -117,20 +118,26 @@
 
   va_list va;
   va_start(va, fmt);
-  async_safe_fatal_va_list("fdsan", fmt, va);
+  if (error_level == ANDROID_FDSAN_ERROR_LEVEL_FATAL) {
+    async_safe_fatal_va_list("fdsan", fmt, va);
+  } else {
+    async_safe_format_log_va_list(ANDROID_LOG_ERROR, "fdsan", fmt, va);
+  }
   va_end(va);
 
   switch (error_level) {
     case ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE:
       atomic_compare_exchange_strong(&fd_table->error_level, &error_level,
                                      ANDROID_FDSAN_ERROR_LEVEL_DISABLED);
+    case ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS:
+      // DEBUGGER_SIGNAL
+      raise(__SIGRTMIN + 3);
       break;
 
     case ANDROID_FDSAN_ERROR_LEVEL_FATAL:
       abort();
 
     case ANDROID_FDSAN_ERROR_LEVEL_DISABLED:
-    case ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS:
       break;
   }
 }
diff --git a/libc/bionic/system_property_api.cpp b/libc/bionic/system_property_api.cpp
index 10d1bb3..051bc4c 100644
--- a/libc/bionic/system_property_api.cpp
+++ b/libc/bionic/system_property_api.cpp
@@ -48,8 +48,6 @@
   return system_properties.Init(PROP_FILENAME) ? 0 : -1;
 }
 
-// This was previously for testing, but now that SystemProperties is its own testable class,
-// there is never a reason to call this function.
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
 int __system_property_set_filename(const char*) {
   return -1;
diff --git a/libc/include/sys/_system_properties.h b/libc/include/sys/_system_properties.h
index 67beb9a..744a45b 100644
--- a/libc/include/sys/_system_properties.h
+++ b/libc/include/sys/_system_properties.h
@@ -58,8 +58,8 @@
 #define PROP_ERROR_SET_FAILED 0x0024
 
 /*
-** Map the property area from the specified filename.  This
-** method is for testing only.
+** This was previously for testing, but now that SystemProperties is its own testable class,
+** there is never a reason to call this function and its implementation simply returns -1.
 */
 int __system_property_set_filename(const char* __filename);
 
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index 201f40a..1607c62 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -94,7 +94,8 @@
 
 #if defined(__STDC__) || defined(__cplusplus)
 #define	__P(protos)	protos		/* full-blown ANSI C */
-#define	__CONCAT(x,y)	x ## y
+#define	__CONCAT1(x,y)	x ## y
+#define	__CONCAT(x,y)	__CONCAT1(x,y)
 #define	__STRING(x)	#x
 
 #if defined(__cplusplus)
diff --git a/libc/seccomp/Android.bp b/libc/seccomp/Android.bp
index ae99857..232024f 100644
--- a/libc/seccomp/Android.bp
+++ b/libc/seccomp/Android.bp
@@ -1,5 +1,6 @@
 cc_library {
     name: "libseccomp_policy",
+    recovery_available: true,
     srcs: [
         "seccomp_policy.cpp",
         "arm_app_policy.cpp",