Exit cleanly for the SRPC "log" requests instead of generating crash reports.

src/shared/platform/nacl_log.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Server Runtime logging code.
  */
 #include "native_client/src/include/nacl_compiler_annotations.h"
@@ skipping 334 matching lines @@
         /*
          * run abort behavior only on edge transition when
          * g_abort_behavior_active is first set.
          */
       }
       NaClXMutexUnlock(&log_mu);
       if (run_abort_behavior) {
 #ifdef __COVERITY__
         NaClAbort();  /* help coverity figure out that this is the default */
 #else
-        (*gNaClLogAbortBehavior)();
+        NaClLogRunAbortBehavior();
 #endif
+        /* The abort behavior hook may not abort, so abort here in case. */
         NaClAbort();
       }
       break;
     default:
       /*
        * Abort handling code in turn aborted.  Eeep!
        */
       NaClAbort();
       break;
   }
@@ skipping 342 matching lines @@
   va_start(ap, fmt);
   NaClLogDoLogAndUnsetModuleV(detail_level, fmt, ap);
   va_end(ap);
 }
 
 void NaClLogSetAbortBehavior(void (*fn)(void)) {
   NaClXMutexLock(&log_mu);
   gNaClLogAbortBehavior = fn;
   NaClXMutexUnlock(&log_mu);
 }
+
+void NaClLogRunAbortBehavior(void) {
+  (*gNaClLogAbortBehavior)();
+}