Did a new install, the new kernel can't load modules:

# modprobe nfsv3
modprobe: ERROR: could not insert 'nfsv3': Exec format error

Odd. Never had this before. The module file itself is a regular 64-bit
ELF file, just as it should be (compared to a working module on another
machine)

gcc is 4.8.4 as supplied by a recent stage3-amd64-20150709.tar.bz2:
# gcc -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.4/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.4/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.8.4/work/gcc-4.8.4/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.8.4
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.4
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.4/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.8.4/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.4/include/g++-v4
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.8.4/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls
--without-included-gettext --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.8.4
p1.6, pie-0.6.1' --enable-libstdcxx-time --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-altivec
--disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --enable-lto
--without-cloog --enable-libsanitizer
Thread model: posix
gcc version 4.8.4 (Gentoo 4.8.4 p1.6, pie-0.6.1)

make.conf seems correct:
CHOST="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"
ACCEPT_KEYWORDS="~amd64"

The kernel loads and runs OK:
# uname -a
Linux download 4.1.2-gentoo #1 SMP Mon Jul 13 13:28:40 SAST 2015 x86_64
Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz GenuineIntel GNU/Linux

and the kernel was built with gcc auto-detection:
# grep NATIVE /boot/config-4.1.2-gentoo
CONFIG_MNATIVE=y

and the .config was grabbed from a working machine with very similar
hardware (one minor hardware upgrade ahead)

I haven't done a full world update yet, most code is still what's in the
stage3, but always in the past that hasn't been a problem; the stage
must successfully build a kernel and load the modules.

Module loading works just fine when booted from the Gentoo minimal
install image.

So, what dumbass n00b error did I make today?


-- 
Alan McKinnon
alan.mckin...@gmail.com


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