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SubjectRe: Linux 2.6.30.2: does not boot
On Mon, Jul 20, 2009 at 03:02:36PM -0700, Linus Torvalds wrote:
> On Mon, 20 Jul 2009, Kiko Piris wrote:
> > Yes, as Marcel Beister pointed, it resulted some binutils bug.
> > Downgrading the package produced a perfectly bootable 2.6.30.2.
> Ok, so it's been narrowed down to binutils. Good.

Okay, I did some work and now got one working and one not working
kernel. The setup code it, except the payload size and the version
string, identical. Now to vmlinux.

First difference (1-vmlinux is the broken, 2-vmlinux is the working
version):
| 2-vmlinux: file format elf32-i386
| 2-vmlinux
| architecture: i386, flags 0x00000113:
| HAS_RELOC, EXEC_P, HAS_SYMS, D_PAGED
vs.
| 1-vmlinux: file format elf32-i386
| 1-vmlinux
| architecture: i386, flags 0x00000013:
| HAS_RELOC, EXEC_P, HAS_SYMS
The file lost its D_PAGED flag.

Next:
| 16 .init.rodata 00000394 c05057e0 005057e0 004067e0 2**4
| CONTENTS, ALLOC, LOAD, RELOC, DATA
| 17 .data.page_aligned 00000800 c0506000 00506000 00407000 2**5
| CONTENTS, ALLOC, LOAD, DATA
vs.
| 16 .init.rodata 00000394 c0506000 00506000 00407000 2**4
| CONTENTS, ALLOC, LOAD, RELOC, DATA
| 17 .data_nosave 00000c6c c0506394 00506394 00407394 2**0
| ALLOC
| 18 .data.page_aligned 00000800 c0507000 00506394 00407394 2**5
| CONTENTS, ALLOC, LOAD, DATA
So suddenly there apears a .data_nosave with some content, but it is
marked the same then a bss section and not even properly aligned
according to the linker script.

The same sections of another working kernel, built with the new
binutils:
| 18 .init.rodata 000003bd c040f4c0 0040f4c0 003104c0 2**2
| CONTENTS, ALLOC, LOAD, RELOC, DATA
| 19 .data_nosave 00001000 c0410000 00410000 00311000 2**2
| CONTENTS, ALLOC, LOAD, DATA
| 20 .data.page_aligned 00000800 c0411000 00411000 00312000 2**2
| CONTENTS, ALLOC, LOAD, DATA
The .data_nosave section is a real one here.

I would say, such holes won't survive the objcopy to create a binary and
all code is at the wrong location.

Bastian

--
Punishment becomes ineffective after a certain point. Men become insensitive.
-- Eneg, "Patterns of Force", stardate 2534.7


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