linux-kernel - Re: [PATCH 1/3] x86/entry: Fix idtentry unwind hint

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Message-ID: <20171026152429.77dkjuwwsocou54t@treble>
Date:   Thu, 26 Oct 2017 10:24:29 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andrei Vagin <avagin@...tuozzo.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, torvalds@...ux-foundation.org,
        peterz@...radead.org, hpa@...or.com, tglx@...utronix.de,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH 1/3] x86/entry: Fix idtentry unwind hint

On Wed, Oct 25, 2017 at 02:07:38PM -0700, Andrei Vagin wrote:
> Hi Josh,
> 
> Here is one more warning:
> [    5.852094] WARNING: can't dereference iret registers at ffffb6ce01b7ffe0 for ip entry_SYSCALL_64_fastpath+0xa/0xc2

Thanks, I hadn't seen this one yet.

I suspect this is in the middle of the ENABLE_INTERRUPTS() paravirt
code, which would mean this is another issue that will be fixed by my
"Make pv ops code generation more closely match reality" patches.

If you can share either the entry_64.o file or the .config, and what
virt platform it's running on (kvm, xen, native), I should be able to
confirm the issue.

I'm in Prague this week but I should have a v2 of those patches in a
week or two (will cc you).

-- 
Josh