Re: "stack state/frame" and "jump dest instruction" errors (was Re: Linux 6.16)

[Google]

On Mon, 28 Jul 2025 08:42:44 -0700
Josh Poimboeuf <jpoimboe@xxxxxxxxxx> wrote:

> On Mon, Jul 28, 2025 at 09:41:35AM +0100, Alan J. Wylie wrote:
> > #regzbot introduced: 6.15.8..6.16

> I don't have time to look at this for at least the next few days, but I
> suspect this one:
> 
>      1a3:	8f ea 78 10 c3 0a 06 00 00 	bextr  $0x60a,%ebx,%eax

Thanks for finding!
Indeed, this is encoded by XOP which is not currently supported
by x86 decodeer. 

> 
> in which case the kernel's x86 decoder (which objtool also uses) needs
> to be updated.

OK, let me see how XOP works.

Thank you,

-- 
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>