使用dlmodule发生内存重复释放的问题

发布于 2022-03-10 14:24:49 浏览：1090 订阅该版

尝试使用rt-thread提供dlmodule，动态模块，运行"Hello, world"，运行后报错，内存重复释放。
```
msh /rt-thread-app>hello.mo
msh /rt-thread-app>
msh /rt-thread-app>Hello, world
to free a bad data block:
mem: 0x20005f4c, used flag: 0, magic code: 0x1ea0
(mem->used) assertion failed at function: rt_free, line number: 594 
to free a bad data block:
mem: 0x20005f34, used flag: 0, magic code: 0x1ea0
(mem->used) assertion failed at function: rt_free, line number: 594 
to free a bad data block:
mem: 0x20005f1c, used flag: 0, magic code: 0x1ea0
(mem->used) assertion failed at function: rt_free, line number: 594 
to free a bad data block:
mem: 0x20006338, used flag: 0, magic code: 0x1ea0
(mem->used) assertion failed at function: rt_free, line number: 594 
to free a bad data block:
mem: 0x20005ebc, used flag: 0, magic code: 0x1ea0
(mem->used) assertion failed at function: rt_free, line number: 594  
```

初步定位后发现是在模块运行完毕后调用会以下接口，释放模块内存
```
_dlmodule_exit();
    ->dlmodule_destroy(module);
```

完了模块线程退出后，会把线程当作垃圾线程处理，放到defunct queue中
```
_thread_exit();
    ->rt_thread_defunct_enqueue(thread);
```

idele线程起来后，在对defunct queue进行回收时又会执行一次dlmodule_destroy
```
rt_thread_idle_entry();
    ->rt_defunct_execute();
        ->dlmodule_destroy(module);
```

最终导致内存重复释放，报错。

使用的内核是4.0.4版本，请问这是已知问题吗？看起来并不是我的程序问题？