Index: lib/sanitizer_common/sanitizer_linux_libcdep.cc
===================================================================
--- lib/sanitizer_common/sanitizer_linux_libcdep.cc
+++ lib/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -91,6 +91,10 @@
         break;
       prev_end = end;
     }
+    // /proc/maps adjusts the real start address so as not to include the stack
+    // guard page. Undo the adjustment here in case rl is in the guard page.
+    if (start > prev_end)
+      start -= GetPageSizeCached();
     CHECK((uptr)&rl >= start && (uptr)&rl < end);
 
     // Get stacksize from rlimit, but clip it so that it does not overlap