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Date:   Wed, 20 Dec 2017 00:34:50 -0600
From:   Josh Poimboeuf <>
To:     Andrey Vagin <>
Cc:     Andrei Vagin <>, X86 ML <>,
        LKML <>,
        Ingo Molnar <>,
        Linus Torvalds <>,
        Peter Zijlstra <>,
        "H. Peter Anvin" <>,
        Thomas Gleixner <>,
        Andy Lutomirski <>
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.


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