Don't merge the mappings if their exec bit are different.

src/client/linux/minidump_writer/linux_dumper.cc

 // Copyright (c) 2010, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 336 matching lines @@
               reinterpret_cast<void*>(start_addr) == linux_gate_loc) {
             name = kLinuxGateLibraryName;
             offset = 0;
           }
           // Merge adjacent mappings with the same name into one module,
           // assuming they're a single library mapped by the dynamic linker
           if (name && !mappings_.empty()) {
             MappingInfo* module = mappings_.back();
             if ((start_addr == module->start_addr + module->size) &&
                 (my_strlen(name) == my_strlen(module->name)) &&
-                (my_strncmp(name, module->name, my_strlen(name)) == 0)) {
+                (my_strncmp(name, module->name, my_strlen(name)) == 0) &&
+                (exec == module->exec)) {
               module->size = end_addr - module->start_addr;
               line_reader->PopLine(line_len);
               continue;
             }
           }
           // Also merge mappings that result from address ranges that the
           // linker reserved but which a loaded library did not use. These
           // appear as an anonymous private mapping with no access flags set
           // and which directly follow an executable mapping.
           if (!name && !mappings_.empty()) {
@@ skipping 228 matching lines @@
       exe_stat.st_dev == new_path_stat.st_dev &&
       exe_stat.st_ino == new_path_stat.st_ino) {
     return false;
   }
 
   my_memcpy(path, exe_link, NAME_MAX);
   return true;
 }
 
 }  // namespace google_breakpad