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Date:   Wed, 29 Nov 2017 14:39:19 +0200
From:   Jarkko Nikula <>
To:     Thomas Gleixner <>
Cc:     Ingo Molnar <>,
        linux-kernel <>,
        Andy Lutomirski <>,
        Peter Zijlstra <>,
        Linus Torvalds <>,
        Borislav Petkov <>
Subject: Re: [PATCH] x86/entry/64: Fix native_load_gs_index() SWAPGS handling
 with IRQ state tracing enabled

On 11/29/2017 11:28 AM, Thomas Gleixner wrote:
> On Wed, 29 Nov 2017, Jarkko Nikula wrote:
>> On 11/29/2017 09:09 AM, Ingo Molnar wrote:
>>> Hm, that commit looks broken with irq-tracing enabled. Does the
>>> patch below fix it?
>> No, it makes the machine not to boot at all :-(
>> Log below when I used my config (now attached). With x86_64_defconfig it
>> booted twice but didn't survive suspend/resume. However several other boot
>> attempts with x86_64_defconfig failed somewhat similarly. Not in the same
>> place but hanging anyway. With my own config it seems to always end up failing
>> in trace_hardirqs_off_caller.
> Does it work when you disable all the tracing muck?
My config seems to work with Ingo's patch if I disable both 

x86_64_defconfig with CONFIG_FTRACE disabled is still unstable. 
Sometimes hangs during bootup and sometimes boots up to userspace.


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