Re: 2.6.18-rc3-g3b445eea BUG: warning at /usr/src/linux-git/kernel/cpu.c:51

From: Chuck Ebbert
Date: Mon Aug 07 2006 - 20:43:20 EST

In-Reply-To: <44D7136E.76E4.0078.0@xxxxxxxxxx>

On Mon, 07 Aug 2006 09:18:22 +0100, Jan Beulich wrote:

> >Most likely the CFI annotation for that sysenter path is not complete.
> Correct, the return point of sysexit (SYSENTER_RETURN) is still in kernel space,
> but its annotations are invisible to the unwinder. We should make the VDSO be
> treated as user-mode code despite living above PAGE_OFFSET.

Umm, that's already been done?

return info->regs.eip < PAGE_OFFSET
|| (info->regs.eip >= __fix_to_virt(FIX_VDSO)
&& info->regs.eip < __fix_to_virt(FIX_VDSO) + PAGE_SIZE)
|| info->regs.esp < PAGE_OFFSET;

Could this be the problem?

| CFI_DEF_CFA esp, 0
|==> CFI_REGISTER esp, ebp
| movl TSS_sysenter_esp0(%esp),%esp

What does that do? .cfi_register is not documented anywhere, not
even in the online documentation for gas. (I spent 10
minutes googling and found nothing other than the changeset that
added it to gas.)


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