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charset="utf-8" After live migration with virtio block device, qemu crash at: #0 0x000055914f46f795 in object_dynamic_cast_assert (obj=3D0x559151b7b090= , typename=3D0x55914f80fbc4 "qio-channel", file=3D0x55914f80fb90 "/images/t= estvfe/sw/qemu.gerrit/include/io/channel.h", line=3D30, func=3D0x55914f80fc= b8 <__func__.17257> "QIO_CHANNEL") at ../qom/object.c:872 #1 0x000055914f480d68 in QIO_CHANNEL (obj=3D0x559151b7b090) at /images/te= stvfe/sw/qemu.gerrit/include/io/channel.h:29 #2 0x000055914f4812f8 in qio_net_listener_set_client_func_full (listener= =3D0x559151b7a720, func=3D0x55914f580b97 , data=3D0x5591519= f4ea0, notify=3D0x0, context=3D0x0) at ../io/net-listener.c:166 #3 0x000055914f580059 in tcp_chr_update_read_handler (chr=3D0x5591519f4ea= 0) at ../chardev/char-socket.c:637 #4 0x000055914f583dca in qemu_chr_be_update_read_handlers (s=3D0x5591519f= 4ea0, context=3D0x0) at ../chardev/char.c:226 #5 0x000055914f57b7c9 in qemu_chr_fe_set_handlers_full (b=3D0x559152bf23a= 0, fd_can_read=3D0x0, fd_read=3D0x0, fd_event=3D0x0, be_change=3D0x0, opaqu= e=3D0x0, context=3D0x0, set_open=3Dfalse, sync_state=3Dtrue) at ../chardev/= char-fe.c:279 #6 0x000055914f57b86d in qemu_chr_fe_set_handlers (b=3D0x559152bf23a0, fd= _can_read=3D0x0, fd_read=3D0x0, fd_event=3D0x0, be_change=3D0x0, opaque=3D0= x0, context=3D0x0, set_open=3Dfalse) at ../chardev/char-fe.c:304 #7 0x000055914f378caf in vhost_user_async_close (d=3D0x559152bf21a0, char= dev=3D0x559152bf23a0, vhost=3D0x559152bf2420, cb=3D0x55914f2fb8c1 ) at ../hw/virtio/vhost-user.c:2725 #8 0x000055914f2fba40 in vhost_user_blk_event (opaque=3D0x559152bf21a0, e= vent=3DCHR_EVENT_CLOSED) at ../hw/block/vhost-user-blk.c:395 #9 0x000055914f58388c in chr_be_event (s=3D0x5591519f4ea0, event=3DCHR_EV= ENT_CLOSED) at ../chardev/char.c:61 #10 0x000055914f583905 in qemu_chr_be_event (s=3D0x5591519f4ea0, event=3DC= HR_EVENT_CLOSED) at ../chardev/char.c:81 #11 0x000055914f581275 in char_socket_finalize (obj=3D0x5591519f4ea0) at .= ./chardev/char-socket.c:1083 #12 0x000055914f46f073 in object_deinit (obj=3D0x5591519f4ea0, type=3D0x55= 91519055c0) at ../qom/object.c:680 #13 0x000055914f46f0e5 in object_finalize (data=3D0x5591519f4ea0) at ../qo= m/object.c:694 #14 0x000055914f46ff06 in object_unref (objptr=3D0x5591519f4ea0) at ../qom= /object.c:1202 #15 0x000055914f4715a4 in object_finalize_child_property (obj=3D0x559151b7= 6c50, name=3D0x559151b7b250 "char3", opaque=3D0x5591519f4ea0) at ../qom/obj= ect.c:1747 #16 0x000055914f46ee86 in object_property_del_all (obj=3D0x559151b76c50) a= t ../qom/object.c:632 #17 0x000055914f46f0d2 in object_finalize (data=3D0x559151b76c50) at ../qo= m/object.c:693 #18 0x000055914f46ff06 in object_unref (objptr=3D0x559151b76c50) at ../qom= /object.c:1202 #19 0x000055914f4715a4 in object_finalize_child_property (obj=3D0x559151b6= b560, name=3D0x559151b76630 "chardevs", opaque=3D0x559151b76c50) at ../qom/= object.c:1747 #20 0x000055914f46ef67 in object_property_del_child (obj=3D0x559151b6b560,= child=3D0x559151b76c50) at ../qom/object.c:654 #21 0x000055914f46f042 in object_unparent (obj=3D0x559151b76c50) at ../qom= /object.c:673 #22 0x000055914f58632a in qemu_chr_cleanup () at ../chardev/char.c:1189 #23 0x000055914f16c66c in qemu_cleanup () at ../softmmu/runstate.c:830 #24 0x000055914eee7b9e in qemu_default_main () at ../softmmu/main.c:38 #25 0x000055914eee7bcc in main (argc=3D86, argv=3D0x7ffc97cb8d88) at ../so= ftmmu/main.c:48 In char_socket_finalize after s->listener freed, event callback function vhost_user_blk_event will be called to handle CHR_EVENT_CLOSED. vhost_user_blk_event is calling qio_net_listener_set_client_func_full which is still using s->listener. Setting s->listener =3D NULL after object_unref(OBJECT(s->listener)) can solve this issue. Signed-off-by: Yajun Wu Acked-by: Jiri Pirko Reviewed-by: Marc-Andr=C3=A9 Lureau --- chardev/char-socket.c | 1 + 1 file changed, 1 insertion(+) diff --git a/chardev/char-socket.c b/chardev/char-socket.c index c2265436ac..8c58532171 100644 --- a/chardev/char-socket.c +++ b/chardev/char-socket.c @@ -1065,6 +1065,7 @@ static void char_socket_finalize(Object *obj) qio_net_listener_set_client_func_full(s->listener, NULL, NULL, NULL, chr->gcontext); object_unref(OBJECT(s->listener)); + s->listener =3D NULL; } if (s->tls_creds) { object_unref(OBJECT(s->tls_creds)); --=20 2.27.0