Here's what results from dereferencing a NULL pointer on a PC running Version 2.6 of the kernel.
这是通过在一台运行着2.6内核的PC机上废弃一个NULL指针所引起的。
When removing a KV from a persistence pointer or freeing the KV, you have to make sure that nobody is dereferencing freed data.
从存储指针或释放kV去除千伏时，你要确保没有人废弃了的数据。
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