Issue in StackwalkerAMD64::GetCallerByFramePointerRecovery.

src/processor/stackwalker_amd64.h

 // 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 60 matching lines @@
   virtual StackFrame* GetContextFrame();
   virtual StackFrame* GetCallerFrame(const CallStack* stack,
                                      bool stack_scan_allowed);
 
   // Use cfi_frame_info (derived from STACK CFI records) to construct
   // the frame that called frames.back(). The caller takes ownership
   // of the returned frame. Return NULL on failure.
   StackFrameAMD64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
                                            CFIFrameInfo* cfi_frame_info);
 
+  // Checks whether end-of-stack is reached.  An instruction address of 0 is an
+  // end-of-stack marker.  If the stack pointer of the caller is at a lower
+  // address than the stack pointer of the callee, then that's clearly incorrect
+  // and it is treated as end-of-stack to enforce progress and avoid infinite
+  // loops.
+  bool IsEndOfStack(uint64_t caller_rip, uint64_t caller_rsp,
+                    uint64_t callee_rsp);
+
   // Assumes a traditional frame layout where the frame pointer has not been
   // omitted. The expectation is that caller's %rbp is pushed to the stack
   // after the return address of the callee, and that the callee's %rsp can
   // be used to find the pushed %rbp.
   // Caller owns the returned frame object. Returns NULL on failure.
   StackFrameAMD64* GetCallerByFramePointerRecovery(
       const vector<StackFrame*>& frames);
 
   // Scan the stack for plausible return addresses. The caller takes ownership
   // of the returned frame. Return NULL on failure.
   StackFrameAMD64* GetCallerByStackScan(const vector<StackFrame*> &frames);
 
   // Stores the CPU context corresponding to the innermost stack frame to
   // be returned by GetContextFrame.
   const MDRawContextAMD64* context_;
 
   // Our register map, for cfi_walker_.
   static const CFIWalker::RegisterSet cfi_register_map_[];
 
   // Our CFI frame walker.
   const CFIWalker cfi_walker_;
 };
 
 
 }  // namespace google_breakpad
 
 
 #endif  // PROCESSOR_STACKWALKER_AMD64_H__