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turn off VDSO on glibc side

Dear Guys and Gals,

I am trying to get a toolchain of gcc-4.7.2/glibc-2.17/binutils-2.23
running on RHEL 5.6 box with kernel 2.6.18-238.el5, as a normal user in
a directory prefix.

The bootstrap of gcc fails in stage2, because of a non-functional cc1.

| build/gcc $ ./cc1
| cc1: internal compiler error: Segmentation fault
| Please submit a full bug report,
| with preprocessed source if appropriate.
| See <> for instructions.
gdb this cc1 gives (don't worry, lib and usr/lib are also 64 bit
libraries in my setup),

| Program received signal SIGSEGV, Segmentation fault.
| 0x00002aaaaaacd6eb in ?? ()
| (gdb) info sharedlibrary 
| From                To                  Syms Read   Shared Object Library
| 0x00002aaaaaaabb70  0x00002aaaaaac5079  Yes (*)     /home/benda/gnto/lib64/
|                                         No
| 0x00002aaaaacd49b0  0x00002aaaaace4480  Yes (*)     /home/benda/gnto/usr/lib/
| 0x00002aaaaaef4cd0  0x00002aaaaaf38c08  Yes (*)     /home/benda/gnto/usr/lib/
| 0x00002aaaab151280  0x00002aaaab19d658  Yes (*)     /home/benda/gnto/usr/lib/
| 0x00002aaaab3b5090  0x00002aaaab3b5b50  Yes (*)     /home/benda/gnto/lib/
| 0x00002aaaab5ba7b0  0x00002aaaab5c6bb0  Yes (*)     /home/benda/gnto/usr/lib/
| 0x00002aaaab7d4a30  0x00002aaaab83d068  Yes (*)     /home/benda/gnto/lib/
| 0x00002aaaabaef660  0x00002aaaabc1e800  Yes (*)     /home/benda/gnto/lib/
| (*): Shared library is missing debugging information.

stepping the program shows that Segmentation fault is emitted by
gettimeofday call, which belongs to vdso.

After some STFW, it seems related to

The question is, can I just disable vdso loading in dynamic linker of
glibc instead of requesting SA to upgrade the kernel?

PS, gcc-4.7.2 built against host glibc-2.5 works fine.

PS2, the toolchains here are from Gentoo, not sure if it is related to
Gentoo patches.

PS3, the problematic binray runs fine on other hosts. I am sure the bug
is from this glibc and kernel combination.

PS4, I tried glibc-2.{9,13,16} as well with no luck. The code of gcc
triggering Segmentation fault are different though, not sure if this
indicates something.


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