diff --git a/tests/Makefile.am b/tests/Makefile.am
index 36a9da1c..68bd4016 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -343,7 +343,8 @@ test_chat_profile_LDADD = $(LIBUTUN) $(COMMON_LIBS)
 test_chat_profile_LDFLAGS = -Wl,--wrap=sqlite3_finalize -Wl,--wrap=sqlite3_prepare_v2 -Wl,--wrap=sqlite3_bind_text \
     -Wl,--wrap=sqlite3_bind_blob -Wl,--wrap=sqlite3_bind_int64 -Wl,--wrap=sqlite3_bind_int -Wl,--wrap=sqlite3_bind_null \
     -Wl,--wrap=sqlite3_step -Wl,--wrap=sqlite3_column_text -Wl,--wrap=sqlite3_exec -Wl,--wrap=sc_ed25519_sign \
-    -Wl,--wrap=sc_ed25519_verify -Wl,--wrap=u_malloc_impl -Wl,--wrap=member_sync_add_apply_cbk -Wl,--wrap=sqlite3_changes
+    -Wl,--wrap=sc_ed25519_verify -Wl,--wrap=u_malloc_impl -Wl,--wrap=member_sync_add_apply_cbk -Wl,--wrap=sqlite3_changes \
+    -Wl,--wrap=u_calloc_impl -Wl,--wrap=u_realloc_impl -Wl,--wrap=u_strdup_impl
 else
 test_socket_monitor_LDFLAGS += -Wl,--wrap=read
 endif
diff --git a/tests/test_chat_profile.c b/tests/test_chat_profile.c
index bb34d931..f2d02fea 100644
--- a/tests/test_chat_profile.c
+++ b/tests/test_chat_profile.c
@@ -23,6 +23,8 @@ static enum fault fault;
 static const char* target;
 static int index_number, last_target, fail_rollback, fail_member_rollback, member_rollback_failed, releases_after_failure;
 static int fail_sign, fail_verify, fail_member_malloc, fail_apply_registration, delete_on_event;
+static unsigned tag_alloc_fail, tag_alloc_seen;
+static int tag_alloc_record;
 static unsigned events, sequence;
 static sqlite3* reader;
 static char channel[32];
@@ -107,6 +109,27 @@ void* __wrap_u_malloc_impl(uint32_t bytes, const char* location) {
     if (fail_member_malloc && strstr(location, "member_sync.c")) { fail_member_malloc = 0; return NULL; }
     return __real_u_malloc_impl(bytes, location);
 }
+
+static int tag_allocation(const char* location, const char* module) {
+    if (!strstr(location, module)) return 0;
+    if (tag_alloc_record) tag_alloc_seen++;
+    if (tag_alloc_fail && !--tag_alloc_fail) {
+        DEBUG_WARN(DEBUG_CATEGORY_CHAT, "tags test: allocation refused at %s", location); return 1;
+    }
+    return 0;
+}
+extern void* __real_u_calloc_impl(uint32_t, uint32_t, const char*);
+void* __wrap_u_calloc_impl(uint32_t count, uint32_t bytes, const char* location) {
+    return tag_allocation(location, "chat_core.c") ? NULL : __real_u_calloc_impl(count, bytes, location);
+}
+extern void* __real_u_realloc_impl(void*, uint32_t, const char*);
+void* __wrap_u_realloc_impl(void* ptr, uint32_t bytes, const char* location) {
+    return tag_allocation(location, "strbuf.c") ? NULL : __real_u_realloc_impl(ptr, bytes, location);
+}
+extern char* __real_u_strdup_impl(const char*, const char*);
+char* __wrap_u_strdup_impl(const char* text, const char* location) {
+    return tag_allocation(location, "chat_core.c") ? NULL : __real_u_strdup_impl(text, location);
+}
 extern int __real_member_sync_add_apply_cbk(struct UTUN_INSTANCE*, member_apply_cbk_fn, void*);
 int __wrap_member_sync_add_apply_cbk(struct UTUN_INSTANCE* inst, member_apply_cbk_fn callback, void* arg) {
     if (fail_apply_registration) { fail_apply_registration = 0; fail_member_malloc = 1; }
@@ -421,6 +444,20 @@ static void tags_patch(struct UTUN_INSTANCE* inst, const char* json) {
     assert(strlen(json) < sizeof(req->json)); strcpy(req->json, json); chat_member_tags_commit_trampoline(req);
 }
 
+static void tags_allocation_faults(struct UTUN_INSTANCE* inst) {
+    struct chat_member_tags* edit = chat_member_tags_load(inst, channel, inst->node_id); assert(edit);
+    assert(!chat_member_tags_set(edit, "owner_test", "memory-00000000"));
+    tag_alloc_seen = 0; tag_alloc_record = 1; assert(!chat_member_tags_commit(inst, edit)); tag_alloc_record = 0;
+    unsigned cases = tag_alloc_seen; assert(cases >= 8); chat_member_tags_free(edit);
+    for (unsigned i = 1; i <= cases; i++) {
+        edit = chat_member_tags_load(inst, channel, inst->node_id); assert(edit);
+        char value[32]; snprintf(value, sizeof(value), "memory-%08u", i); assert(!chat_member_tags_set(edit, "owner_test", value));
+        tag_alloc_fail = i; tags_refused(inst, edit); assert(!tag_alloc_fail && !strcmp(chat_member_tags_get(edit, "owner_test"), value));
+        assert(!chat_member_tags_commit(inst, edit)); chat_member_tags_free(edit);
+    }
+    printf("PASS tags memory:%u allocation faults/retries through snapshot,JSON growth,and prepared editor\n", cases);
+}
+
 static void tags_semantics(struct UTUN_INSTANCE* inst) {
     struct chat_member_tags* first = chat_member_tags_load(inst, channel, inst->node_id);
     struct chat_member_tags* stale = chat_member_tags_load(inst, channel, inst->node_id); assert(first && stale);
@@ -527,7 +564,8 @@ int main(void) {
     assert(rc < 0 && !fail_read && timestamp == 123 && !memcmp(profile, previous, sizeof(profile)) && !memcmp(signature, old_signature, 64));
     assert(!chat_core_get_my_profile(inst, channel, profile, sizeof(profile), signature, &timestamp) && timestamp > 0);
     chat_event_set_handler(inst, event); reader_faults(inst); writer_faults(inst); damaged_profile(inst); semantic_profile(inst);
-    owner_faults(inst); avatar(inst); tags_reader_failure(inst); tags_faults(inst); tags_semantics(inst); tags_long_history(inst); tags_callback_deletion(inst);
+    owner_faults(inst); avatar(inst); tags_reader_failure(inst); tags_faults(inst); tags_allocation_faults(inst);
+    tags_semantics(inst); tags_long_history(inst); tags_callback_deletion(inst);
     registration_failure(inst, ua); callback_deletion(inst);
     uint8_t before[32], after[32]; snapshot(reader, before); unsigned count = events;
     target = "COMMIT /* profile */"; fault = F_EXEC; fail_rollback = 1; inst->running = 1;