On Wed, Dec 16, 2020 at 2:41 AM Eduardo Habkost <ehabk...@redhat.com> wrote:
> commit 1e419ee68fa5 ("chardev: generate an internal id when none
> given") changed the reference ownership semantics of
> qemu_chardev_new(NULL, ...): now all chardevs created using
> qemu_chardev_new() are added to the /chardevs QOM container, and
> the caller does not own a reference to the newly created object.
>
> However, the code at char_file_test_internal() had not been
> updated and was calling object_unref() on a chardev object it
> didn't own. This makes the chardev be destroyed, but leaves a
> dangling pointer in the /chardev container children list, and
> seems to be the cause of the following char_serial_test() crash:
>
> Unexpected error in object_property_try_add() at ../qom/object.c:1220: \
> attempt to add duplicate property 'serial-id' to object (type
> 'container')
> ERROR test-char - too few tests run (expected 38, got 9)
>
> Update the code to use object_unparent() at the end of
> char_file_test_internal(), to make sure the chardev will be
> correctly removed from the QOM tree.
>
> Fixes: 1e419ee68fa5 ("chardev: generate an internal id when none given")
> Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
>
nice catch
Reviewed-by: Marc-André Lureau <marcandre.lur...@redhat.com>
---
> tests/test-char.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tests/test-char.c b/tests/test-char.c
> index 953e0d1c1f..06102977b6 100644
> --- a/tests/test-char.c
> +++ b/tests/test-char.c
> @@ -1298,7 +1298,7 @@ static void char_file_test_internal(Chardev
> *ext_chr, const char *filepath)
> g_assert(strncmp(contents, "hello!", 6) == 0);
>
> if (!ext_chr) {
> - object_unref(OBJECT(chr));
> + object_unparent(OBJECT(chr));
> g_unlink(out);
> }
> g_free(contents);
> --
> 2.28.0
>
>
