[lkml]   [2011]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: bug: kernel 3.0-rc3 not relocatable on i386?
On Wed, Jun 15, 2011 at 4:12 AM, Petr Tesarik <> wrote:
> Hi all,
> it seems that the 3.0-rc3 kernel is not relocatable on i386. I get
> warnings about jiffies being an absolute symbol, and indeed, when GRUB
> loads the kernel at a non-default address, jiffies is not relocated.
> In my example the kernel is configured with
> and loaded at 0x200000 by GRUB.
> Booting fails when checking whether the timer works, because do_timer()
> increments jiffies_64, but timer_irq_works() checks jiffies. The code
> looks like this:
> c13daab7:       8b 3d 40 7a 39 c1       mov    0xc1397a40,%edi
> but arch/x86/boot/compressed/vmlinux.relocs does not contain c13daaba.
> Consequently, timer_irq_works() reads the wrong memory location and
> fails, causing a panic:
> kernel panic: IO-APIC + timer doesn't work! Boot with apic=debug and
> send a report.  Then try booting with the 'noapic' option.
> Needless to say, the kernel freezes a few initcalls later when booted
> with noapic, because IO-APIC worked fine, in fact. I verified that by
> inserting a debugging printk() in do_timer(), and I also verified with
> that printk() that the address of jiffies_64 and the address of jiffies
> differ at run time.
> Any idea how to fix this?

This could be a regression in
8c49d9a74bac5ea3f18480307057241b808fcc0c, but I haven't spotted it
yet. I'm having trouble reproducing this, though: I see the
relocation in the output of relocs --text.

Can you send me your .config? I'll fiddle with it.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2011-06-15 13:19    [W:0.058 / U:1.424 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site