morningman opened a new issue #6119:
URL: https://github.com/apache/incubator-doris/issues/6119
**Describe the bug**
```
#0 0x00000000019fb29f in doris::SchemaChangeHandler::_validate_alter_result
(this=<optimized out>, new_tablet=std::shared_ptr<doris::Tablet> (use count 3,
weak count 1) = {...}, request=...)
at ../src/olap/schema_change.cpp:2204
#1 0x0000000001a0fe73 in
doris::SchemaChangeHandler::_do_process_alter_tablet_v2 (this=<optimized out>,
request=...) at ../src/olap/schema_change.cpp:1618
#2 0x0000000001a10862 in
doris::SchemaChangeHandler::process_alter_tablet_v2 (this=0x3fd3b60
<doris::SchemaChangeHandler::instance()::instance>, request=...) at
../src/olap/schema_change.cpp:1389
#3 0x0000000001a3b56d in doris::EngineAlterTabletTask::execute
(this=0x7f6dc4119b10) at ../src/olap/task/engine_alter_tablet_task.cpp:40
#4 0x00000000011e52d9 in doris::StorageEngine::execute_task
(this=0x619b200, task=0x7f6dc4119b10) at ../src/olap/storage_engine.cpp:991
#5 0x0000000001846f6a in doris::TaskWorkerPool::_alter_tablet
(this=0x6333520, agent_task_req=..., signature=427282,
task_type=doris::TTaskType::ALTER, finish_task_request=0x7f6dc4119c00)
at ../src/agent/task_worker_pool.cpp:533
#6 0x00000000018519ca in
doris::TaskWorkerPool::_alter_tablet_worker_thread_callback (this=0x6333520) at
../src/agent/task_worker_pool.cpp:490
#7 0x000000000152de80 in std::function<void ()>::operator()() const
(this=0x6428f18) at
/opt/rh/devtoolset-10/root/usr/include/c++/10/bits/std_function.h:622
#8 doris::FunctionRunnable::run (this=0x6428f10) at
../src/util/threadpool.cpp:42
#9 doris::ThreadPool::dispatch_thread (this=0x5caddc0) at
../src/util/threadpool.cpp:548
#10 0x0000000001528413 in std::function<void ()>::operator()() const
(this=0x65d7998) at
/opt/rh/devtoolset-10/root/usr/include/c++/10/bits/std_function.h:622
#11 doris::Thread::supervise_thread (arg=0x65d7980) at
../src/util/thread.cpp:385
#12 0x000000318b207851 in __nptl_setxid () from /lib64/libpthread.so.0
#13 0x0000000000000000 in ?? ()
```
**To Reproduce**
Hard to reproduce. The reason may be that the meta lock is not added when
`get_rowset_by_version()` is called, which leads to some undefined behaviors.
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