Merge remote-tracking branch 'kwolf/for-anthony' into staging

* kwolf/for-anthony:
  qemu-img: Fix segmentation fault
  qcow2: Don't ignore failure to clear autoclear flags
  coroutine: Fix setup of sigaltstack coroutines

block/qcow2.c

@@ -300,7 +300,10 @@ static int qcow2_open(BlockDriverState *bs, int flags)
 
     if (!bs->read_only && s->autoclear_features != 0) {
         s->autoclear_features = 0;
-        qcow2_update_header(bs);
+        ret = qcow2_update_header(bs);
+        if (ret < 0) {
+            goto fail;
+        }
     }
 
     /* Check support for various header values */

coroutine-sigaltstack.c

@@ -226,7 +226,7 @@ static Coroutine *coroutine_new(void)
      * called.
      */
     coTS->tr_called = 0;
-    kill(getpid(), SIGUSR2);
+    pthread_kill(pthread_self(), SIGUSR2);
     sigfillset(&sigs);
     sigdelset(&sigs, SIGUSR2);
     while (!coTS->tr_called) {

qemu-img.c

@@ -712,6 +712,9 @@ static int img_convert(int argc, char **argv)
 
     out_filename = argv[argc - 1];
 
+    /* Initialize before goto out */
+    qemu_progress_init(progress, 2.0);
+
     if (options && !strcmp(options, "?")) {
         ret = print_block_option_help(out_filename, out_fmt);
         goto out;
@@ -724,7 +727,6 @@ static int img_convert(int argc, char **argv)
         goto out;
     }
 
-    qemu_progress_init(progress, 2.0);
     qemu_progress_print(0, 100);
 
     bs = g_malloc0(bs_n * sizeof(BlockDriverState *));