diff --git a/block/block-backend.c b/block/block-backend.c
index d8d99f4396..55aaaf7527 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -227,6 +227,7 @@ static void blk_root_activate(BdrvChild *child, Error **errp)
 
 void blk_set_force_allow_inactivate(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     blk->force_allow_inactivate = true;
 }
 
@@ -345,6 +346,8 @@ BlockBackend *blk_new(AioContext *ctx, uint64_t perm, uint64_t shared_perm)
 {
     BlockBackend *blk;
 
+    assert(qemu_in_main_thread());
+
     blk = g_new0(BlockBackend, 1);
     blk->refcnt = 1;
     blk->ctx = ctx;
@@ -382,6 +385,8 @@ BlockBackend *blk_new_with_bs(BlockDriverState *bs, uint64_t perm,
 {
     BlockBackend *blk = blk_new(bdrv_get_aio_context(bs), perm, shared_perm);
 
+    assert(qemu_in_main_thread());
+
     if (blk_insert_bs(blk, bs, errp) < 0) {
         blk_unref(blk);
         return NULL;
@@ -410,6 +415,8 @@ BlockBackend *blk_new_open(const char *filename, const char *reference,
     uint64_t perm = 0;
     uint64_t shared = BLK_PERM_ALL;
 
+    assert(qemu_in_main_thread());
+
     /*
      * blk_new_open() is mainly used in .bdrv_create implementations and the
      * tools where sharing isn't a major concern because the BDS stays private
@@ -487,6 +494,7 @@ static void drive_info_del(DriveInfo *dinfo)
 
 int blk_get_refcnt(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk ? blk->refcnt : 0;
 }
 
@@ -497,6 +505,7 @@ int blk_get_refcnt(BlockBackend *blk)
 void blk_ref(BlockBackend *blk)
 {
     assert(blk->refcnt > 0);
+    assert(qemu_in_main_thread());
     blk->refcnt++;
 }
 
@@ -507,6 +516,7 @@ void blk_ref(BlockBackend *blk)
  */
 void blk_unref(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     if (blk) {
         assert(blk->refcnt > 0);
         if (blk->refcnt > 1) {
@@ -527,6 +537,7 @@ void blk_unref(BlockBackend *blk)
  */
 BlockBackend *blk_all_next(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk ? QTAILQ_NEXT(blk, link)
                : QTAILQ_FIRST(&block_backends);
 }
@@ -535,6 +546,8 @@ void blk_remove_all_bs(void)
 {
     BlockBackend *blk = NULL;
 
+    assert(qemu_in_main_thread());
+
     while ((blk = blk_all_next(blk)) != NULL) {
         AioContext *ctx = blk_get_aio_context(blk);
 
@@ -558,6 +571,7 @@ void blk_remove_all_bs(void)
  */
 BlockBackend *blk_next(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk ? QTAILQ_NEXT(blk, monitor_link)
                : QTAILQ_FIRST(&monitor_block_backends);
 }
@@ -624,6 +638,7 @@ static void bdrv_next_reset(BdrvNextIterator *it)
 
 BlockDriverState *bdrv_first(BdrvNextIterator *it)
 {
+    assert(qemu_in_main_thread());
     bdrv_next_reset(it);
     return bdrv_next(it);
 }
@@ -661,6 +676,7 @@ bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp)
 {
     assert(!blk->name);
     assert(name && name[0]);
+    assert(qemu_in_main_thread());
 
     if (!id_wellformed(name)) {
         error_setg(errp, "Invalid device name");
@@ -688,6 +704,8 @@ bool monitor_add_blk(BlockBackend *blk, const char *name, Error **errp)
  */
 void monitor_remove_blk(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
+
     if (!blk->name) {
         return;
     }
@@ -703,6 +721,7 @@ void monitor_remove_blk(BlockBackend *blk)
  */
 const char *blk_name(const BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->name ?: "";
 }
 
@@ -714,6 +733,7 @@ BlockBackend *blk_by_name(const char *name)
 {
     BlockBackend *blk = NULL;
 
+    assert(qemu_in_main_thread());
     assert(name);
     while ((blk = blk_next(blk)) != NULL) {
         if (!strcmp(name, blk->name)) {
@@ -748,6 +768,7 @@ static BlockBackend *bdrv_first_blk(BlockDriverState *bs)
  */
 bool bdrv_has_blk(BlockDriverState *bs)
 {
+    assert(qemu_in_main_thread());
     return bdrv_first_blk(bs) != NULL;
 }
 
@@ -758,6 +779,7 @@ bool bdrv_is_root_node(BlockDriverState *bs)
 {
     BdrvChild *c;
 
+    assert(qemu_in_main_thread());
     QLIST_FOREACH(c, &bs->parents, next_parent) {
         if (c->klass != &child_root) {
             return false;
@@ -807,6 +829,7 @@ BlockBackend *blk_by_legacy_dinfo(DriveInfo *dinfo)
  */
 BlockBackendPublic *blk_get_public(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return &blk->public;
 }
 
@@ -815,6 +838,7 @@ BlockBackendPublic *blk_get_public(BlockBackend *blk)
  */
 BlockBackend *blk_by_public(BlockBackendPublic *public)
 {
+    assert(qemu_in_main_thread());
     return container_of(public, BlockBackend, public);
 }
 
@@ -827,6 +851,8 @@ void blk_remove_bs(BlockBackend *blk)
     BlockDriverState *bs;
     BdrvChild *root;
 
+    assert(qemu_in_main_thread());
+
     notifier_list_notify(&blk->remove_bs_notifiers, blk);
     if (tgm->throttle_state) {
         bs = blk_bs(blk);
@@ -854,6 +880,7 @@ void blk_remove_bs(BlockBackend *blk)
 int blk_insert_bs(BlockBackend *blk, BlockDriverState *bs, Error **errp)
 {
     ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
+    assert(qemu_in_main_thread());
     bdrv_ref(bs);
     blk->root = bdrv_root_attach_child(bs, "root", &child_root,
                                        BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
@@ -888,6 +915,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
 {
     int ret;
 
+    assert(qemu_in_main_thread());
     if (blk->root && !blk->disable_perm) {
         ret = bdrv_child_try_set_perm(blk->root, perm, shared_perm, errp);
         if (ret < 0) {
@@ -903,6 +931,7 @@ int blk_set_perm(BlockBackend *blk, uint64_t perm, uint64_t shared_perm,
 
 void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm)
 {
+    assert(qemu_in_main_thread());
     *perm = blk->perm;
     *shared_perm = blk->shared_perm;
 }
@@ -913,6 +942,7 @@ void blk_get_perm(BlockBackend *blk, uint64_t *perm, uint64_t *shared_perm)
  */
 int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
 {
+    assert(qemu_in_main_thread());
     if (blk->dev) {
         return -EBUSY;
     }
@@ -938,6 +968,7 @@ int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
 void blk_detach_dev(BlockBackend *blk, DeviceState *dev)
 {
     assert(blk->dev == dev);
+    assert(qemu_in_main_thread());
     blk->dev = NULL;
     blk->dev_ops = NULL;
     blk->dev_opaque = NULL;
@@ -951,6 +982,7 @@ void blk_detach_dev(BlockBackend *blk, DeviceState *dev)
  */
 DeviceState *blk_get_attached_dev(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->dev;
 }
 
@@ -959,6 +991,7 @@ DeviceState *blk_get_attached_dev(BlockBackend *blk)
 char *blk_get_attached_dev_id(BlockBackend *blk)
 {
     DeviceState *dev = blk->dev;
+    assert(qemu_in_main_thread());
 
     if (!dev) {
         return g_strdup("");
@@ -979,6 +1012,8 @@ BlockBackend *blk_by_dev(void *dev)
 {
     BlockBackend *blk = NULL;
 
+    assert(qemu_in_main_thread());
+
     assert(dev != NULL);
     while ((blk = blk_all_next(blk)) != NULL) {
         if (blk->dev == dev) {
@@ -996,6 +1031,7 @@ BlockBackend *blk_by_dev(void *dev)
 void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
                      void *opaque)
 {
+    assert(qemu_in_main_thread());
     blk->dev_ops = ops;
     blk->dev_opaque = opaque;
 
@@ -1017,6 +1053,7 @@ void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops,
  */
 void blk_dev_change_media_cb(BlockBackend *blk, bool load, Error **errp)
 {
+    assert(qemu_in_main_thread());
     if (blk->dev_ops && blk->dev_ops->change_media_cb) {
         bool tray_was_open, tray_is_open;
         Error *local_err = NULL;
@@ -1108,6 +1145,7 @@ static void blk_root_resize(BdrvChild *child)
 
 void blk_iostatus_enable(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     blk->iostatus_enabled = true;
     blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
 }
@@ -1116,6 +1154,7 @@ void blk_iostatus_enable(BlockBackend *blk)
  * enables it _and_ the VM is configured to stop on errors */
 bool blk_iostatus_is_enabled(const BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return (blk->iostatus_enabled &&
            (blk->on_write_error == BLOCKDEV_ON_ERROR_ENOSPC ||
             blk->on_write_error == BLOCKDEV_ON_ERROR_STOP   ||
@@ -1124,16 +1163,19 @@ bool blk_iostatus_is_enabled(const BlockBackend *blk)
 
 BlockDeviceIoStatus blk_iostatus(const BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->iostatus;
 }
 
 void blk_iostatus_disable(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     blk->iostatus_enabled = false;
 }
 
 void blk_iostatus_reset(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     if (blk_iostatus_is_enabled(blk)) {
         blk->iostatus = BLOCK_DEVICE_IO_STATUS_OK;
     }
@@ -1141,6 +1183,7 @@ void blk_iostatus_reset(BlockBackend *blk)
 
 void blk_iostatus_set_err(BlockBackend *blk, int error)
 {
+    assert(qemu_in_main_thread());
     assert(blk_iostatus_is_enabled(blk));
     if (blk->iostatus == BLOCK_DEVICE_IO_STATUS_OK) {
         blk->iostatus = error == ENOSPC ? BLOCK_DEVICE_IO_STATUS_NOSPACE :
@@ -1373,6 +1416,7 @@ int blk_pwrite_zeroes(BlockBackend *blk, int64_t offset,
 
 int blk_make_zero(BlockBackend *blk, BdrvRequestFlags flags)
 {
+    assert(qemu_in_main_thread());
     return bdrv_make_zero(blk->root, flags);
 }
 
@@ -1401,6 +1445,7 @@ BlockAIOCB *blk_abort_aio_request(BlockBackend *blk,
                                   void *opaque, int ret)
 {
     struct BlockBackendAIOCB *acb;
+    assert(qemu_in_main_thread());
 
     blk_inc_in_flight(blk);
     acb = blk_aio_get(&block_backend_aiocb_info, blk, cb, opaque);
@@ -1551,6 +1596,7 @@ void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
 
 int64_t blk_nb_sectors(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     if (!blk_is_available(blk)) {
         return -ENOMEDIUM;
     }
@@ -1576,6 +1622,7 @@ BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset,
 
 void blk_aio_cancel(BlockAIOCB *acb)
 {
+    assert(qemu_in_main_thread());
     bdrv_aio_cancel(acb);
 }
 
@@ -1739,6 +1786,8 @@ void blk_drain(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
 
+    assert(qemu_in_main_thread());
+
     if (bs) {
         bdrv_drained_begin(bs);
     }
@@ -1756,6 +1805,8 @@ void blk_drain_all(void)
 {
     BlockBackend *blk = NULL;
 
+    assert(qemu_in_main_thread());
+
     bdrv_drain_all_begin();
 
     while ((blk = blk_all_next(blk)) != NULL) {
@@ -1775,6 +1826,7 @@ void blk_drain_all(void)
 void blk_set_on_error(BlockBackend *blk, BlockdevOnError on_read_error,
                       BlockdevOnError on_write_error)
 {
+    assert(qemu_in_main_thread());
     blk->on_read_error = on_read_error;
     blk->on_write_error = on_write_error;
 }
@@ -1858,6 +1910,7 @@ void blk_error_action(BlockBackend *blk, BlockErrorAction action,
 bool blk_supports_write_perm(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         return !bdrv_is_read_only(bs);
@@ -1878,6 +1931,7 @@ bool blk_is_writable(BlockBackend *blk)
 bool blk_is_sg(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (!bs) {
         return false;
@@ -1888,17 +1942,20 @@ bool blk_is_sg(BlockBackend *blk)
 
 bool blk_enable_write_cache(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->enable_write_cache;
 }
 
 void blk_set_enable_write_cache(BlockBackend *blk, bool wce)
 {
+    assert(qemu_in_main_thread());
     blk->enable_write_cache = wce;
 }
 
 void blk_invalidate_cache(BlockBackend *blk, Error **errp)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (!bs) {
         error_setg(errp, "Device '%s' has no medium", blk->name);
@@ -1911,7 +1968,6 @@ void blk_invalidate_cache(BlockBackend *blk, Error **errp)
 bool blk_is_inserted(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
-
     return bs && bdrv_is_inserted(bs);
 }
 
@@ -1923,6 +1979,7 @@ bool blk_is_available(BlockBackend *blk)
 void blk_lock_medium(BlockBackend *blk, bool locked)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         bdrv_lock_medium(bs, locked);
@@ -1932,6 +1989,8 @@ void blk_lock_medium(BlockBackend *blk, bool locked)
 void blk_eject(BlockBackend *blk, bool eject_flag)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
+
     char *id;
 
     if (bs) {
@@ -1949,6 +2008,7 @@ void blk_eject(BlockBackend *blk, bool eject_flag)
 int blk_get_flags(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         return bdrv_get_flags(bs);
@@ -2002,6 +2062,7 @@ int blk_get_max_iov(BlockBackend *blk)
 
 void blk_set_guest_block_size(BlockBackend *blk, int align)
 {
+    assert(qemu_in_main_thread());
     blk->guest_block_size = align;
 }
 
@@ -2018,6 +2079,7 @@ void *blk_blockalign(BlockBackend *blk, size_t size)
 bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (!bs) {
         return false;
@@ -2029,6 +2091,7 @@ bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp)
 void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         bdrv_op_unblock(bs, op, reason);
@@ -2038,6 +2101,7 @@ void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason)
 void blk_op_block_all(BlockBackend *blk, Error *reason)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         bdrv_op_block_all(bs, reason);
@@ -2047,6 +2111,7 @@ void blk_op_block_all(BlockBackend *blk, Error *reason)
 void blk_op_unblock_all(BlockBackend *blk, Error *reason)
 {
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     if (bs) {
         bdrv_op_unblock_all(bs, reason);
@@ -2101,6 +2166,7 @@ static int blk_do_set_aio_context(BlockBackend *blk, AioContext *new_context,
 int blk_set_aio_context(BlockBackend *blk, AioContext *new_context,
                         Error **errp)
 {
+    assert(qemu_in_main_thread());
     return blk_do_set_aio_context(blk, new_context, true, errp);
 }
 
@@ -2137,6 +2203,7 @@ void blk_add_aio_context_notifier(BlockBackend *blk,
 {
     BlockBackendAioNotifier *notifier;
     BlockDriverState *bs = blk_bs(blk);
+    assert(qemu_in_main_thread());
 
     notifier = g_new(BlockBackendAioNotifier, 1);
     notifier->attached_aio_context = attached_aio_context;
@@ -2159,6 +2226,8 @@ void blk_remove_aio_context_notifier(BlockBackend *blk,
     BlockBackendAioNotifier *notifier;
     BlockDriverState *bs = blk_bs(blk);
 
+    assert(qemu_in_main_thread());
+
     if (bs) {
         bdrv_remove_aio_context_notifier(bs, attached_aio_context,
                                          detach_aio_context, opaque);
@@ -2179,11 +2248,13 @@ void blk_remove_aio_context_notifier(BlockBackend *blk,
 
 void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify)
 {
+    assert(qemu_in_main_thread());
     notifier_list_add(&blk->remove_bs_notifiers, notify);
 }
 
 void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify)
 {
+    assert(qemu_in_main_thread());
     notifier_list_add(&blk->insert_bs_notifiers, notify);
 }
 
@@ -2245,6 +2316,7 @@ int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
                      int64_t pos, int size)
 {
     int ret;
+    assert(qemu_in_main_thread());
 
     if (!blk_is_available(blk)) {
         return -ENOMEDIUM;
@@ -2264,6 +2336,7 @@ int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
 
 int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
 {
+    assert(qemu_in_main_thread());
     if (!blk_is_available(blk)) {
         return -ENOMEDIUM;
     }
@@ -2273,6 +2346,7 @@ int blk_load_vmstate(BlockBackend *blk, uint8_t *buf, int64_t pos, int size)
 
 int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
 {
+    assert(qemu_in_main_thread());
     if (!blk_is_available(blk)) {
         return -ENOMEDIUM;
     }
@@ -2282,6 +2356,7 @@ int blk_probe_blocksizes(BlockBackend *blk, BlockSizes *bsz)
 
 int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
 {
+    assert(qemu_in_main_thread());
     if (!blk_is_available(blk)) {
         return -ENOMEDIUM;
     }
@@ -2295,6 +2370,7 @@ int blk_probe_geometry(BlockBackend *blk, HDGeometry *geo)
  */
 void blk_update_root_state(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     assert(blk->root);
 
     blk->root_state.open_flags    = blk->root->bs->open_flags;
@@ -2307,6 +2383,7 @@ void blk_update_root_state(BlockBackend *blk)
  */
 bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->root_state.detect_zeroes;
 }
 
@@ -2316,17 +2393,20 @@ bool blk_get_detect_zeroes_from_root_state(BlockBackend *blk)
  */
 int blk_get_open_flags_from_root_state(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->root_state.open_flags;
 }
 
 BlockBackendRootState *blk_get_root_state(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return &blk->root_state;
 }
 
 int blk_commit_all(void)
 {
     BlockBackend *blk = NULL;
+    assert(qemu_in_main_thread());
 
     while ((blk = blk_all_next(blk)) != NULL) {
         AioContext *aio_context = blk_get_aio_context(blk);
@@ -2351,6 +2431,7 @@ int blk_commit_all(void)
 /* throttling disk I/O limits */
 void blk_set_io_limits(BlockBackend *blk, ThrottleConfig *cfg)
 {
+    assert(qemu_in_main_thread());
     throttle_group_config(&blk->public.throttle_group_member, cfg);
 }
 
@@ -2359,6 +2440,7 @@ void blk_io_limits_disable(BlockBackend *blk)
     BlockDriverState *bs = blk_bs(blk);
     ThrottleGroupMember *tgm = &blk->public.throttle_group_member;
     assert(tgm->throttle_state);
+    assert(qemu_in_main_thread());
     if (bs) {
         bdrv_drained_begin(bs);
     }
@@ -2372,12 +2454,14 @@ void blk_io_limits_disable(BlockBackend *blk)
 void blk_io_limits_enable(BlockBackend *blk, const char *group)
 {
     assert(!blk->public.throttle_group_member.throttle_state);
+    assert(qemu_in_main_thread());
     throttle_group_register_tgm(&blk->public.throttle_group_member,
                                 group, blk_get_aio_context(blk));
 }
 
 void blk_io_limits_update_group(BlockBackend *blk, const char *group)
 {
+    assert(qemu_in_main_thread());
     /* this BB is not part of any group */
     if (!blk->public.throttle_group_member.throttle_state) {
         return;
@@ -2445,11 +2529,13 @@ static void blk_root_drained_end(BdrvChild *child, int *drained_end_counter)
 
 void blk_register_buf(BlockBackend *blk, void *host, size_t size)
 {
+    assert(qemu_in_main_thread());
     bdrv_register_buf(blk_bs(blk), host, size);
 }
 
 void blk_unregister_buf(BlockBackend *blk, void *host)
 {
+    assert(qemu_in_main_thread());
     bdrv_unregister_buf(blk_bs(blk), host);
 }
 
@@ -2474,11 +2560,13 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
 
 const BdrvChild *blk_root(BlockBackend *blk)
 {
+    assert(qemu_in_main_thread());
     return blk->root;
 }
 
 int blk_make_empty(BlockBackend *blk, Error **errp)
 {
+    assert(qemu_in_main_thread());
     if (!blk_is_available(blk)) {
         error_setg(errp, "No medium inserted");
         return -ENOMEDIUM;
diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 0705f00846..7312635224 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -942,6 +942,8 @@ BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
     DeviceState *dev;
     BlockBackend *blk;
 
+    assert(qemu_in_main_thread());
+
     dev = find_device_state(id, errp);
     if (dev == NULL) {
         return NULL;
