linux-kernel - v2.6.28-rc2: x86_32 relocation regression?

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Date:	Mon, 24 Nov 2008 22:19:05 +0100
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Cc:	"Huang Ying" <ying.huang@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: v2.6.28-rc2: x86_32 relocation regression?

Hi,

I couldn't help noticing that addr2line no longer works for me since
at least v2.6.28-rc2. I get this:

EIP: 0060:[<c039e613>] EFLAGS: 00000202 CPU: 0
EIP is at strcpy+0x13/0x30

    $ addr2line -e vmlinux -i c039e613
    ??:0

...even though the kernel was configured with CONFIG_DEBUG_INFO=y.

    $ grep DEBUG_INFO .config
    CONFIG_DEBUG_INFO=y

gdb too:

    (gdb) disas 0xc039e613
    No function contains specified address.

This is a simple x86_32 defconfig with CONFIG_DEBUG_INFO toggled.

    $ nm vmlinux | grep strcpy
    c12a3b90 t scsi_strcpy_devinfo
    c119e600 T strcpy

It looks like everything was offset by 0xe00000:

    $ addr2line -e vmlinux c119e613
    arch/x86/lib/string_32.c:20

I have also this:

 virtual kernel memory layout:
     fixmap  : 0xffc79000 - 0xfffff000   (3608 kB)
     pkmap   : 0xff400000 - 0xff800000   (4096 kB)
     vmalloc : 0xc87f0000 - 0xff3fe000   ( 876 MB)
     lowmem  : 0xc0000000 - 0xc7ff0000   ( 127 MB)
       .init : 0xc08ce000 - 0xc0932000   ( 400 kB)
       .data : 0xc06c9a4b - 0xc08c46ec   (2027 kB)
       .text : 0xc0200000 - 0xc06c9a4b   (4902 kB)

Any ideas?

Thanks,


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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