Exactly same as previous patch, but refactored to only have a single pthread_attr_destroy() call instead of 3.

diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index b7463c0ca6..1006a168fa 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -34,6 +34,8 @@
 #undef  THREAD_STACK_SIZE
 #define THREAD_STACK_SIZE       0x400000
 #endif
+/* minimum size of the default thread stack size */
+#define THREAD_STACK_MIN_DEFAULT 0x100000
 /* for safety, ensure a viable minimum stacksize */
 #define THREAD_STACK_MIN        0x8000  /* 32 KiB */
 #else  /* !_POSIX_THREAD_ATTR_STACKSIZE */
@@ -167,7 +169,7 @@ unsigned long
 PyThread_start_new_thread(void (*func)(void *), void *arg)
 {
     pthread_t th;
-    int status;
+    int status = -1;
 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
     pthread_attr_t attrs;
 #endif
@@ -187,11 +189,15 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
     PyThreadState *tstate = PyThreadState_GET();
     size_t stacksize = tstate ? tstate->interp->pythread_stacksize : 0;
     tss = (stacksize != 0) ? stacksize : THREAD_STACK_SIZE;
+    if (tss == 0 && THREAD_STACK_SIZE == 0) {
+        if (pthread_attr_getstacksize(&attrs, &tss) != 0)
+           goto thread_abort;
+       if (tss != 0 && tss < THREAD_STACK_MIN_DEFAULT)
+           tss = THREAD_STACK_MIN_DEFAULT;
+    }
     if (tss != 0) {
-        if (pthread_attr_setstacksize(&attrs, tss) != 0) {
-            pthread_attr_destroy(&attrs);
-            return PYTHREAD_INVALID_THREAD_ID;
-        }
+        if (pthread_attr_setstacksize(&attrs, tss) != 0)
+           goto thread_abort;
     }
 #endif
 #if defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
@@ -209,6 +215,7 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
                              );
 
 #if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
+thread_abort:
     pthread_attr_destroy(&attrs);
 #endif
     if (status != 0)