From 91b8b139893877cca509f35afa0075713d2ff7f3 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Fri, 29 Mar 2013 16:37:25 -0700
Subject: Extra log information when pthread_create fails.

Bug: 8470684

(cherry picked from commit 3eeda5e6fe172758e47d237694daf4f9421f3c12)

Change-Id: Ideba410d393b69753bbfae7558a2692edd08d339
---
 vm/Thread.cpp | 56 +++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 45 insertions(+), 11 deletions(-)

diff --git a/vm/Thread.cpp b/vm/Thread.cpp
index ded6f0f1f..5ca055fe0 100644
--- a/vm/Thread.cpp
+++ b/vm/Thread.cpp
@@ -27,13 +27,10 @@
 #include <sys/resource.h>
 #include <sys/mman.h>
 #include <signal.h>
+#include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 
-#ifdef HAVE_ANDROID_OS
-#include <dirent.h>
-#endif
-
 #if defined(HAVE_PRCTL)
 #include <sys/prctl.h>
 #endif
@@ -1311,13 +1308,53 @@ bool dvmCreateInterpThread(Object* threadObj, int reqStackSize)
          * resource limits.  VirtualMachineError is probably too severe,
          * so use OutOfMemoryError.
          */
-        ALOGE("pthread_create (stack size %d bytes) failed: %s", stackSize, strerror(cc));
+
+#if HAVE_ANDROID_OS
+        struct mallinfo malloc_info;
+        malloc_info = mallinfo();
+        ALOGE("Native heap free: %zd of %zd bytes", malloc_info.fordblks, malloc_info.uordblks);
+#endif
+
+        size_t thread_count = 0;
+        DIR* d = opendir("/proc/self/task");
+        if (d != NULL) {
+            dirent* entry = NULL;
+            while ((entry = readdir(d)) != NULL) {
+                char* end;
+                strtol(entry->d_name, &end, 10);
+                if (!*end) {
+                    ++thread_count;
+                }
+            }
+            closedir(d);
+        }
+
+        ALOGE("pthread_create (%d threads) failed: %s", thread_count, strerror(cc));
+
+        // Super-verbose output to help track down http://b/8470684.
+        size_t map_count = 0;
+        FILE* fp = fopen("/proc/self/maps", "r");
+        if (fp != NULL) {
+            char buf[1024];
+            while (fgets(buf, sizeof(buf), fp) != NULL) {
+                ALOGE("/proc/self/maps: %s", buf);
+                ++map_count;
+            }
+            fclose(fp);
+        }
 
         dvmSetFieldObject(threadObj, gDvm.offJavaLangThread_vmThread, NULL);
 
         dvmThrowExceptionFmt(gDvm.exOutOfMemoryError,
-                             "pthread_create (stack size %d bytes) failed: %s",
-                             stackSize, strerror(cc));
+                             "pthread_create (%d threads, %d map entries, "
+#if HAVE_ANDROID_OS
+                             "%zd free of %zd native heap bytes"
+#endif
+                             ") failed: %s", thread_count, map_count,
+#if HAVE_ANDROID_OS
+                             malloc_info.fordblks, malloc_info.uordblks,
+#endif
+                             strerror(cc));
         goto fail;
     }
 
@@ -3490,10 +3527,7 @@ void dvmDumpAllThreadsEx(const DebugOutputTarget* target, bool grabLock)
     }
 
 #ifdef HAVE_ANDROID_OS
-    char path[64];
-    snprintf(path, sizeof(path), "/proc/%d/task", getpid());
-
-    DIR* d = opendir(path);
+    DIR* d = opendir("/proc/self/task");
     if (d != NULL) {
         dirent* entry = NULL;
         bool first = true;
-- 
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