diff --git a/deps/oblib/src/lib/allocator/ob_block_alloc_mgr.h b/deps/oblib/src/lib/allocator/ob_block_alloc_mgr.h
index 0d5ad75c95..3ae4d0a72b 100644
--- a/deps/oblib/src/lib/allocator/ob_block_alloc_mgr.h
+++ b/deps/oblib/src/lib/allocator/ob_block_alloc_mgr.h
@@ -32,9 +32,8 @@ public:
   int64_t hold() const { return ATOMIC_LOAD(&hold_); }
   void* alloc_block(int64_t size, ObMemAttr &attr) {
     void *ret = NULL;
-    bool ignore_mem_limit = get_ignore_mem_limit();
     int64_t used_after_alloc = ATOMIC_AAF(&hold_, size);
-    if (!ignore_mem_limit && used_after_alloc > limit_) {
+    if (used_after_alloc > limit_) {
       ATOMIC_AAF(&hold_, -size);
       if (REACH_TIME_INTERVAL(1000 * 1000)) {
         _OB_LOG_RET(WARN, common::OB_ERR_UNEXPECTED, "block alloc over limit, limit=%ld alloc_size=%ld", limit_, size);
diff --git a/deps/oblib/src/lib/lock/ob_bucket_lock.cpp b/deps/oblib/src/lib/lock/ob_bucket_lock.cpp
index 8e350a644d..ec1477d910 100644
--- a/deps/oblib/src/lib/lock/ob_bucket_lock.cpp
+++ b/deps/oblib/src/lib/lock/ob_bucket_lock.cpp
@@ -82,7 +82,7 @@ void ObBucketLock::destroy()
 {
   is_inited_ = false;
   if (NULL != latches_) {
-    for (uint64_t i = 0; i < latch_cnt_; ++i) {
+    for (int64_t i = latch_cnt_ - 1; i >= 0; --i) {
       latches_[i].~ObLatch();
     }
     ob_free(latches_);
@@ -240,7 +240,7 @@ int ObBucketLock::wrlock_all()
     }
 
     if (OB_FAIL(ret)) {
-      for (int64_t i = 0; i <= last_succ_idx; ++i) {
+      for (int64_t i = last_succ_idx; i >= 0; --i) {
         latches_[i].unlock();
       }
     }
@@ -287,7 +287,7 @@ int ObBucketLock::try_lock_all(const bool is_write_lock)
     }
 
     if (OB_FAIL(ret)) {
-      for (int64_t i = 0; i <= last_succ_idx; ++i) {
+      for (int64_t i = last_succ_idx; i >= 0; --i) {
         latches_[i].unlock();
       }
     }
@@ -306,7 +306,7 @@ int ObBucketLock::unlock_all()
     ret = OB_NOT_INIT;
     COMMON_LOG(WARN, "The ObBucketLock has not been inited, ", K(ret));
   } else {
-    for (int64_t i = 0; OB_SUCC(ret) && i < latch_cnt_; ++i) {
+    for (int64_t i = latch_cnt_ - 1; OB_SUCC(ret) && i >= 0; --i) {
       latches_[i].unlock();
     }
   }
diff --git a/deps/oblib/src/lib/lock/ob_latch.cpp b/deps/oblib/src/lib/lock/ob_latch.cpp
index f479f6481f..f0d51eea97 100644
--- a/deps/oblib/src/lib/lock/ob_latch.cpp
+++ b/deps/oblib/src/lib/lock/ob_latch.cpp
@@ -73,7 +73,7 @@ int ObLatchMutex::try_lock(
     if (!ATOMIC_BCAS(&lock_.val(), 0, (WRITE_MASK | uid))) {
       ret = OB_EAGAIN;
     } else {
-      IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)&lock_.val());
+      IGNORE_RETURN ObLatch::reg_lock((uint32_t*)&lock_.val());
     }
     if (need_record_stat()) {
       TRY_LOCK_RECORD_STAT(latch_id, 1, ret);
@@ -610,7 +610,7 @@ int ObLatch::try_rdlock(const uint32_t latch_id)
           ++i;
           if (ATOMIC_BCAS(&lock_, lock, lock + 1)) {
             ret = OB_SUCCESS;
-            IGNORE_RETURN unreg_lock((uint32_t*)&lock_);
+            IGNORE_RETURN reg_lock((uint32_t*)&lock_);
             break;
           }
         }
@@ -640,7 +640,7 @@ int ObLatch::try_wrlock(const uint32_t latch_id, const uint32_t *puid)
     if (!ATOMIC_BCAS(&lock_, 0, (WRITE_MASK | uid))) {
       ret = OB_EAGAIN;
     } else {
-      IGNORE_RETURN unreg_lock((uint32_t*)&lock_);
+      IGNORE_RETURN reg_lock((uint32_t*)&lock_);
     }
     if (need_record_stat()) {
       TRY_LOCK_RECORD_STAT(latch_id, 1, ret);
@@ -711,7 +711,6 @@ int ObLatch::wr2rdlock(const uint32_t *puid)
       lock = lock_;
       PAUSE();
     }
-    IGNORE_RETURN unreg_lock((uint32_t*)&lock_);
     bool only_rd_wait = true;
     if (OB_FAIL(ObLatchWaitQueue::get_instance().wake_up(*this, only_rd_wait))) {
       COMMON_LOG(ERROR, "Fail to wake up latch wait queue, ", K(this), K(ret));
diff --git a/deps/oblib/src/lib/lock/ob_latch.h b/deps/oblib/src/lib/lock/ob_latch.h
index 853ea60bfc..9e2e92c41e 100644
--- a/deps/oblib/src/lib/lock/ob_latch.h
+++ b/deps/oblib/src/lib/lock/ob_latch.h
@@ -233,33 +233,22 @@ public:
     if (max_lock_slot_idx < sizeof(current_locks) / sizeof(uint32_t*)) {
       ret = max_lock_slot_idx++;
       current_locks[ret] = latch_addr;
-    } else {
-      for (auto i = 0; -1 == ret && i < sizeof(current_locks) / sizeof(uint32_t*); ++i) {
-        if (OB_ISNULL(current_locks[i]) || 0 == *current_locks[i]) {
-          ret = i;
-          current_locks[i] = latch_addr;
-        }
-      }
     }
     return ret;
   }
   OB_INLINE static int unreg_lock(uint32_t* latch_addr)
   {
     int ret = -1;
-    for (int8_t i = max_lock_slot_idx - 1; -1 == ret && i >= 0; --i) {
-      if (latch_addr == current_locks[i]) {
-        ret = i;
-        current_locks[i] = nullptr;
-        if (ret == max_lock_slot_idx - 1) {
-          --max_lock_slot_idx;
-        }
-      }
-    }
+    // for (int8_t i = max_lock_slot_idx - 1; -1 == ret && i >= 0; --i) {
+    //   if (latch_addr == current_locks[i]) {
+    //     ret = i;
+    //     current_locks[i] = max_lock_slot_idx > 0 ? current_locks[--max_lock_slot_idx] : nullptr;
+    //   }
+    // }
     return ret;
   }
   OB_INLINE static void clear_lock()
   {
-    MEMSET(current_locks, 0, max_lock_slot_idx * sizeof(current_locks[0]));
     max_lock_slot_idx = 0;
   }
   static thread_local uint32_t* current_locks[16];
@@ -495,7 +484,7 @@ OB_INLINE uint64_t ObLatchMutex::low_try_lock(const int64_t max_spin_cnt, const
   for (; spin_cnt < max_spin_cnt; ++spin_cnt) {
     if (0 == lock_.val()) {
       if (ATOMIC_BCAS(&lock_.val(), 0, lock_value)) {
-        IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)(&lock_.val()));
+        IGNORE_RETURN ObLatch::reg_lock((uint32_t*)(&lock_.val()));
         break;
       }
     }
@@ -557,7 +546,7 @@ inline int ObLatch::LowTryRDLock::operator()(volatile uint32_t *latch,
       conflict = false;
       if (ATOMIC_BCAS(latch, lock, lock + 1)) {
         ret = OB_SUCCESS;
-        IGNORE_RETURN unreg_lock((uint32_t*)latch);
+        IGNORE_RETURN reg_lock((uint32_t*)latch);
       }
     } else {
       conflict = true;
@@ -580,7 +569,7 @@ inline int ObLatch::LowTryWRLock::operator()(volatile uint32_t *latch,
     conflict = false;
     if (ATOMIC_BCAS(latch, lock, (lock | (WRITE_MASK | uid)))) {
       ret = OB_SUCCESS;
-      IGNORE_RETURN unreg_lock((uint32_t*)latch);
+      IGNORE_RETURN reg_lock((uint32_t*)latch);
     }
   } else {
     conflict = true;
diff --git a/deps/oblib/src/lib/lock/ob_tc_rwlock.h b/deps/oblib/src/lib/lock/ob_tc_rwlock.h
index 251633a841..e63c91239b 100644
--- a/deps/oblib/src/lib/lock/ob_tc_rwlock.h
+++ b/deps/oblib/src/lib/lock/ob_tc_rwlock.h
@@ -150,7 +150,7 @@ public:
     }
     if (OB_SUCC(ret)) {
       // record in try_rdlock will be overwrited by latch_.rdlock, so record again.
-      IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)&(latch_.lock_));
+      IGNORE_RETURN ObLatch::reg_lock((uint32_t*)&(latch_.lock_));
     }
     return ret;
   }
@@ -161,7 +161,7 @@ public:
       get_tcref().inc_ref(&read_ref_);
       if (OB_LIKELY(0 == ATOMIC_LOAD(&write_id_))) {
         locked = true;
-        IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)&(latch_.lock_));
+        IGNORE_RETURN ObLatch::reg_lock((uint32_t*)&(latch_.lock_));
       } else {
         get_tcref().dec_ref(&read_ref_);
         lcond_.signal();
@@ -260,7 +260,7 @@ public:
       get_tcref().inc_ref(&read_ref_, slot_id);
       if (OB_LIKELY(0 == ATOMIC_LOAD(&write_id_))) {
         locked = true;
-        IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)&(latch_.lock_));
+        IGNORE_RETURN ObLatch::reg_lock((uint32_t*)&(latch_.lock_));
       } else {
         get_tcref().dec_ref(&read_ref_, slot_id);
         lcond_.signal();
@@ -278,7 +278,7 @@ public:
     }
     if (OB_SUCC(ret)) {
       // record in try_rdlock will be overwrited by latch_.rdlock, so record again.
-      IGNORE_RETURN ObLatch::unreg_lock((uint32_t*)&(latch_.lock_));
+      IGNORE_RETURN ObLatch::reg_lock((uint32_t*)&(latch_.lock_));
     }
     return ret;
   }
diff --git a/deps/oblib/src/lib/ob_define.h b/deps/oblib/src/lib/ob_define.h
index d83a408bdc..89c0e1c159 100644
--- a/deps/oblib/src/lib/ob_define.h
+++ b/deps/oblib/src/lib/ob_define.h
@@ -2291,12 +2291,6 @@ OB_INLINE int64_t &get_tid_cache()
   return (&tid)->v_;
 }
 
-OB_INLINE bool &get_ignore_mem_limit()
-{
-  RLOCAL_INLINE(bool, ignore_mem_limit);
-  return ignore_mem_limit;
-}
-
 OB_INLINE int64_t &get_seq()
 {
   RLOCAL_INLINE(int64_t, seq);
diff --git a/src/diagnose/lua/ob_lua_api.cpp b/src/diagnose/lua/ob_lua_api.cpp
index 33685fe2ec..cfd6cf043f 100644
--- a/src/diagnose/lua/ob_lua_api.cpp
+++ b/src/diagnose/lua/ob_lua_api.cpp
@@ -1894,12 +1894,13 @@ int dump_thread_info(lua_State *L)
         // latch_hold
         {
           GET_OTHER_TSI_ADDR(uint32_t**, locks_addr, &ObLatch::current_locks);
+          GET_OTHER_TSI_ADDR(int8_t, slot_cnt, &ObLatch::max_lock_slot_idx)
           locks_addr = (uint32_t**)(thread_base + locks_addr_offset);
           char addrs[256];
           addrs[0] = 0;
-          for (auto i = 0, offset1 = 0; i < sizeof(ObLatch::current_locks) / sizeof(uint32_t*); ++i) {
-            if (OB_NOT_NULL(locks_addr[i])) {
-              offset1 = snprintf(addrs + offset1, 256 - offset1, "%p ", locks_addr[i]);
+          for (auto i = 0, offset1 = 0; i < slot_cnt; ++i) {
+            if (OB_NOT_NULL(locks_addr[i]) && offset1 < 256) {
+              offset1 += snprintf(addrs + offset1, 256 - offset1, "%p ", locks_addr[i]);
             }
           }
           if (0 == addrs[0]) {
diff --git a/src/observer/virtual_table/ob_all_virtual_thread.cpp b/src/observer/virtual_table/ob_all_virtual_thread.cpp
index 0dd7b2840a..6ee3081bc0 100644
--- a/src/observer/virtual_table/ob_all_virtual_thread.cpp
+++ b/src/observer/virtual_table/ob_all_virtual_thread.cpp
@@ -138,7 +138,7 @@ int ObAllVirtualThread::inner_get_next_row(common::ObNewRow *&row)
                   ObCharset::get_default_collation(ObCharset::get_default_charset()));
               break;
             }
-            case LATCH_WAIT_ADDR: {
+            case LATCH_WAIT: {
               if (OB_ISNULL(wait_addr)) {
                 cells[i].set_varchar("");
               } else {
@@ -149,19 +149,20 @@ int ObAllVirtualThread::inner_get_next_row(common::ObNewRow *&row)
                   ObCharset::get_default_collation(ObCharset::get_default_charset()));
               break;
             }
-            case LATCH_HOLD_ADDR: {
+            case LATCH_HOLD: {
               GET_OTHER_TSI_ADDR(uint32_t**, locks_addr, &ObLatch::current_locks);
+              GET_OTHER_TSI_ADDR(int8_t, slot_cnt, &ObLatch::max_lock_slot_idx)
               locks_addr = (uint32_t**)(thread_base + locks_addr_offset);
               locks_addr_[0] = 0;
-              for (auto i = 0, j = 0; i < sizeof(ObLatch::current_locks) / sizeof(uint32_t*); ++i) {
+              for (auto i = 0, j = 0; i < slot_cnt; ++i) {
                 if (OB_NOT_NULL(locks_addr[i])) {
                   bool has_segv = false;
                   uint32_t val = 0;
                   do_with_crash_restore([&] {
                     val = *locks_addr[i];
                   }, has_segv);
-                  if (!has_segv && 0 != val) {
-                    j = snprintf(locks_addr_ + j, 256 - j, "%p ", locks_addr[i]);
+                  if (!has_segv && 0 != val && j < 256) {
+                    j += snprintf(locks_addr_ + j, 256 - j, "%p ", locks_addr[i]);
                   }
                 }
               }
diff --git a/src/observer/virtual_table/ob_all_virtual_thread.h b/src/observer/virtual_table/ob_all_virtual_thread.h
index c91435893d..d57c4b1f95 100644
--- a/src/observer/virtual_table/ob_all_virtual_thread.h
+++ b/src/observer/virtual_table/ob_all_virtual_thread.h
@@ -30,8 +30,8 @@ class ObAllVirtualThread : public common::ObVirtualTableScannerIterator
     TNAME,
     STATUS,
     WAIT_EVENT,
-    LATCH_WAIT_ADDR,
-    LATCH_HOLD_ADDR,
+    LATCH_WAIT,
+    LATCH_HOLD,
     TRACE_ID,
     LOOP_TS
   };