0-initialize the function dump....

base/debug_util_win.cc

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug_util.h"
 
 #include <windows.h>
 #include <dbghelp.h>
 
 #include <iostream>
@@ skipping 103 matching lines @@
       const int kMaxNameLength = 256;
       DWORD_PTR frame = reinterpret_cast<DWORD_PTR>(trace[i]);
 
       // Code adapted from MSDN example:
       // http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx
       ULONG64 buffer[
         (sizeof(SYMBOL_INFO) +
           kMaxNameLength * sizeof(wchar_t) +
           sizeof(ULONG64) - 1) /
         sizeof(ULONG64)];
+      memset(buffer, 0, sizeof(buffer));
 
       // Initialize symbol information retrieval structures.
       DWORD64 sym_displacement = 0;
       PSYMBOL_INFO symbol = reinterpret_cast<PSYMBOL_INFO>(&buffer[0]);
       symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
-      symbol->MaxNameLen = kMaxNameLength;
+      symbol->MaxNameLen = kMaxNameLength - 1;
       BOOL has_symbol = SymFromAddr(GetCurrentProcess(), frame,
                                     &sym_displacement, symbol);
 
       // Attempt to retrieve line number information.
       DWORD line_displacement = 0;
       IMAGEHLP_LINE64 line = {};
       line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
       BOOL has_line = SymGetLineFromAddr64(GetCurrentProcess(), frame,
                                            &line_displacement, &line);
 
@@ skipping 131 matching lines @@
     (*os) << "Error initializing symbols (" << error
           << ").  Dumping unresolved backtrace:\n";
     for (int i = 0; (i < count_) && os->good(); ++i) {
       (*os) << "\t" << trace_[i] << "\n";
     }
   } else {
     (*os) << "Backtrace:\n";
     context->OutputTraceToStream(trace_, count_, os);
   }
 }