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

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Message-ID: <20171220063450.6jjxki3wuszgvhxb@treble>
Date:   Wed, 20 Dec 2017 00:34:50 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andrey Vagin <avagin@...tuozzo.com>
Cc:     Andrei Vagin <avagin@...il.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH 1/3] x86/entry: Fix idtentry unwind hint

On Wed, Dec 20, 2017 at 05:41:44AM +0000, Andrey Vagin wrote:
> Hi Josh,
> 
> 
> Now I see these two warnings on Linus' tree:
> 
> [    1.902454] WARNING: stack recursion on stack type 1
> [    1.902466] WARNING: can't dereference iret registers at 00000000cd089a12 for ip entry_SYSCALL_64_fastpath+0x5/0x86

This still looks like the same issue where ORC is getting confused by
paravirt patching.  Unfortunately the patches which fix this got
preempted by other work again.  I haven't forgotten about it.

2017 is out the window, but hopefully in January I'll get a chance to
revive the patches.

-- 
Josh