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Date:   Thu, 23 Nov 2017 07:29:40 -0800
From:   Andy Lutomirski <>
To:     Ingo Molnar <>
Cc:     Andy Lutomirski <>,
        Thomas Gleixner <>, X86 ML <>,
        Borislav Petkov <>,
        "" <>,
        Brian Gerst <>,
        Dave Hansen <>,
        Linus Torvalds <>,
        Josh Poimboeuf <>
Subject: Re: [PATCH v2 00/18] Entry stack switching

On Wed, Nov 22, 2017 at 10:58 PM, Ingo Molnar <> wrote:
> * Ingo Molnar <> wrote:
>> * Ingo Molnar <> wrote:
>> > > Anyway, I booted your config (more or less -- I munged it through
>> > > virtme-configkernel --update first) with 17 vCPUs and it seems fine.
>> > > Is the issue reliable enough to bisect?
>> >
>> > Ok, it should be bisectable, will try to bisect it.
>> The latestest entry-stack code appears to be working fine though.
>> So one of the below fixes from yesterday appears to have done the trick.
>> I'll re-test today to make sure: maybe it's more sporadic than I thought, in one
>> of the bootups I got the do_IRQ warning only once, in half a day of uptime.
> I re-tested and it all seems fine now. I suspect it got fixed by:
>   ca37e57bbe0c: x86/entry/64: Add missing irqflags tracing to native_load_gs_index()
> still it is weird, because I boot that system with latest -tip on a daily basis,
> and don't remember having seen that warning.
> Do you have any theory for why the entry stack changes would uncover this bug?

No.  I also don't see why it would have anything to do with irqflag
tracing.  As far as I know, the unhandled IRQ warning has nothing to
do with tracing or lockdep.

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