__vdso_time missing from core utils?

Question

I built the latest glibc and now i'm having some trouble with functions in coreutils like ls or cat or anything else like vim.

My error is

-bash-4.0$ cat
cat: error while loading shared libraries: __vdso_time: invalid mode for dlopen(): Invalid argument

and I built, glibc without errors with the following configure

../glibc/configure --prefix=/home/ex/uid377/glibbuilt

On older versions, like 2.14, running the utilities results in a segmentation fault.

-bash-4.0$ ./pwd
./pwd: /lib64/libc.so.6: version `GLIBC_2.14' not found (required by ./pwd)
-bash-4.0$ LD_LIBRARY_PATH=/home/ex/uid377/glibc/lib/:${LD_LIBRARY_PATH}
-bash-4.0$ ./pwd
Segmentation fault (core dumped)

---

Edit Kernel Version

-bash-4.0$ uname -r
2.6.32.26-175.fc12.x86_64

Solution

Having multiple versions of glibc on a single system is possible, but slightly tricky, as explained in this answer. In particular, this:

LD_LIBRARY_PATH=/home/ex/uid377/glibc/lib/:${LD_LIBRARY_PATH}

is expected to crash, because your ld-linux-x86-64.so.2 will not match your libc.so.6

cat: error while loading shared libraries: __vdso_time: invalid mode for dlopen(): ...

It's not clear how you built this cat, but it's most likely the exact same problem: you are picking some libraries from /lib64, and some from /home/ex/uid377/glibc/lib. Don't do that. You must link all the programs that will use /home/ex/uid377/glibc/lib/libc.so.6 with -Wl,--dynamic-linker=/home/ex/uid377/glibc/lib/ld-linux-x86-64.so.2.

You can trace which libraries are currently being loaded by running:

env LD_DEBUG=files,libs ./cat