Re: [Qemu-devel] [PATCH] migration: release MigrationIncomingState in migration_object_finalize

[858585 jemmy]

On Fri, Jul 6, 2018 at 6:41 PM, Dr. David Alan Gilbert
<dgilb...@redhat.com> wrote:
> * Dr. David Alan Gilbert (dgilb...@redhat.com) wrote:
>> * Lidong Chen (jemmy858...@gmail.com) wrote:
>> > Qemu initialize the MigrationIncomingState structure in 
>> > migration_object_init,
>> > but not release it. this patch release it in migration_object_finalize.
>> >
>> > Signed-off-by: Lidong Chen <lidongc...@tencent.com>
>>
>> Queued
>
> I've had to unqueue this, see below:
>
>>
>> > ---
>> >  migration/migration.c | 7 +++++++
>> >  1 file changed, 7 insertions(+)
>> >
>> > diff --git a/migration/migration.c b/migration/migration.c
>> > index 05aec2c..e009a05 100644
>> > --- a/migration/migration.c
>> > +++ b/migration/migration.c
>> > @@ -156,6 +156,13 @@ void migration_object_init(void)
>> >  void migration_object_finalize(void)
>> >  {
>> >      object_unref(OBJECT(current_migration));
>> > +
>> > +    qemu_sem_destroy(&current_incoming->postcopy_pause_sem_fault);
>> > +    qemu_sem_destroy(&current_incoming->postcopy_pause_sem_dst);
>> > +    qemu_event_destroy(&current_incoming->main_thread_load_event);
>> > +    qemu_mutex_destroy(&current_incoming->rp_mutex);
>> > +    g_array_free(current_incoming->postcopy_remote_fds, true);
>
> That array is already free'd in migration_incoming_state_destroy,
> so I see reliable glib assert's from this array free.

The migration_incoming_state_destroy only invoked in destination qemu.
The source qemu will not free this memory.
So I think free current_incoming->postcopy_remote_fds is not good way.

and migration_object_init and migration_object_finalize should not be
invoked in main
function. It's better to  alloc memory when start migration and
release it when migration finished.

I will submit a new version patch to fix it.

>
> Dave
>
>> > +    g_free(current_incoming);
>> >  }
>> >
>> >  /* For outgoing */
>> > --
>> > 1.8.3.1
>> >
>> --
>> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
> --
> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK