lsdev | grep iocp
smitty iocp
启用IOCP试试看。

是因为在调试时曾经加了个环境变量LDR_CNTRL=SHARED_SYMTAB=Y，
查了一下这个变量的解释：
Specifying the SHARED_SYMTAB=Y option causes the system to create a shared symbol table for a 64-bit program, if the program exports any symbols. If multiple instances of the program run concurrently, using a shared symbol table can reduce the amount of system memory that is required by the program.

Specifying the SHARED_SYMTAB=N option prevents the system from creating a shared symbol table for a 64-bit program. This option overrides the AOUT_SHR_SYMTAB flag in the XCOFF auxiliary header.

我的报错信息就是某写symbols 不能 exported。
注释掉这个环境变量就没有问题了。