运行Valgrind后，生成的日志文件包含许多看似
的错误Conditional jump or move depends on uninitialised value(s)
at 0x3D9863AA: ???
by 0x3D986287: ???
by 0x3D9854AC: ???
Uninitialised value was created by a heap allocation
at 0x7FCC050: operator new(unsigned int) (vg_replace_malloc.c:214)
by 0x3D9A56A4: ???
by 0x3D9A4EB9: ???
环顾四周后，我发现以下一行对于获取实际内容非常重要，而不仅仅是???：
Discarding syms at 0x3d97dba0-0x3da53de8 in /path/SomeDLL.so due to munmap()
请注意，所有???来自Discarding syms行指定范围内的地址。
是什么导致Valgrind丢弃共享库的符号信息以及如何修复它？