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charset="utf-8" After live migration with virtio block device, qemu crash at: #0 0x00007fe051e54269 in g_source_destroy () at /lib/x86_64-linux-gnu/libg= lib-2.0.so.0 #1 0x000055cebaa5f37d in qio_net_listener_set_client_func_full (listener= =3D0x55cebceab340, func=3D0x55cebab4f5f2 , data=3D0x55cebcd= fcc00, notify=3D0x0, context=3D0x0) at ../io/net-listener.c:157 #2 0x000055cebab4ea99 in tcp_chr_update_read_handler (chr=3D0x55cebcdfcc00= ) at ../chardev/char-socket.c:639 #3 0x000055cebab529fa in qemu_chr_be_update_read_handlers (s=3D0x55cebcdfc= c00, context=3D0x0) at ../chardev/char.c:226 #4 0x000055cebab4a04e in qemu_chr_fe_set_handlers_full (b=3D0x55cebdf52120= , fd_can_read=3D0x0, fd_read=3D0x0, fd_event=3D0x0, be_change=3D0x0, opaque= =3D0x0, context=3D0x0, set_open=3Dfalse, sync_state=3Dtrue) at ../chardev/c= har-fe.c:279 #5 0x000055cebab4a0f6 in qemu_chr_fe_set_handlers(b=3D0x55cebdf52120, fd_c= an_read=3D0x0, fd_read=3D0x0, fd_event=3D0x0, be_change=3D0x0, opaque=3D0x0= , context=3D0x0, set_open=3Dfalse) at ../chardev/char-fe.c:304 #6 0x000055ceba8ec3c8 in vhost_user_blk_event (opaque=3D0x55cebdf51f40, ev= ent=3DCHR_EVENT_CLOSED) at ../hw/block/vhost-user-blk.c:412 #7 0x000055cebab524a1 in chr_be_event (s=3D0x55cebcdfcc00, event=3DCHR_EVE= NT_CLOSED) at ../chardev/char.c:61 #8 0x000055cebab52519 in qemu_chr_be_event (s=3D0x55cebcdfcc00, event=3DCH= R_EVENT_CLOSED) at ../chardev/char.c:81 #9 0x000055cebab4fce4 in char_socket_finalize (obj=3D0x55cebcdfcc00) at ..= /chardev/char-socket.c:1085 #10 0x000055cebaa4cde5 in object_deinit (obj=3D0x55cebcdfcc00, type=3D0x55= cebcc67160) at ../qom/object.c:675 #11 0x000055cebaa4ce5b in object_finalize (data=3D0x55cebcdfcc00) at ../qo= m/object.c:689 #12 0x000055cebaa4dcec in object_unref (objptr=3D0x55cebcdfcc00) at ../qom= /object.c:1192 #13 0x000055cebaa4f3ee in object_finalize_child_property (obj=3D0x55cebcc6= df40, name=3D0x55cebcead490 "char0", opaque=3D0x55cebcdfcc00) at ../qom/obj= ect.c:1735 #14 0x000055cebaa4cbe4 in object_property_del_all (obj=3D0x55cebcc6df40) a= t ../qom/object.c:627 #15 0x000055cebaa4ce48 in object_finalize (data=3D0x55cebcc6df40) at ../qo= m/object.c:688 #16 0x000055cebaa4dcec in object_unref (objptr=3D0x55cebcc6df40) at ../qom= /object.c:1192 #17 0x000055cebaa4f3ee in object_finalize_child_property (obj=3D0x55cebce9= 6e00, name=3D0x55cebceab300 "chardevs", opaque=3D0x55cebcc6df40) at ../qom/= object.c:1735 #18 0x000055cebaa4ccd1 in object_property_del_child (obj=3D0x55cebce96e00,= child=3D0x55cebcc6df40) at ../qom/object.c:649 #19 0x000055cebaa4cdb0 in object_unparent (obj=3D0x55cebcc6df40) at ../qom= /object.c:668 #20 0x000055cebab55124 in qemu_chr_cleanup () at ../chardev/char.c:1222 #21 0x000055ceba79a561 in qemu_cleanup () at ../softmmu/runstate.c:823 #22 0x000055ceba53d65f in qemu_main (argc=3D78, argv=3D0x7ffc9440bd98, env= p=3D0x0) at ../softmmu/main.c:37 #23 0x000055ceba53d68f in main (argc=3D78, argv=3D0x7ffc9440bd98) at ../so= ftmmu/main.c:45 Function qemu_chr_fe_set_handlers should not be called in qemu_chr_cleanup, because chardev already freed. Quick fix is to handle RUN_STATE_POSTMIGRATE same as RUN_STATE_SHUTDOWN. Better solution is to add block device cleanup function like net_cleanup and call it in qemu_cleanup. Signed-off-by: Yajun Wu Acked-by: Parav Pandit --- hw/block/vhost-user-blk.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 0d5190accf..b323d5820b 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -110,7 +110,7 @@ static int vhost_user_blk_handle_config_change(struct v= host_dev *dev) } =20 /* valid for resize only */ - if (blkcfg.capacity !=3D s->blkcfg.capacity) { + if (s && blkcfg.capacity !=3D s->blkcfg.capacity) { s->blkcfg.capacity =3D blkcfg.capacity; memcpy(dev->vdev->config, &s->blkcfg, vdev->config_len); virtio_notify_config(dev->vdev); @@ -398,7 +398,8 @@ static void vhost_user_blk_event(void *opaque, QEMUChrE= vent event) } break; case CHR_EVENT_CLOSED: - if (!runstate_check(RUN_STATE_SHUTDOWN)) { + if (!runstate_check(RUN_STATE_SHUTDOWN) && + !runstate_check(RUN_STATE_POSTMIGRATE)) { /* * A close event may happen during a read/write, but vhost * code assumes the vhost_dev remains setup, so delay the --=20 2.27.0