linux-kernel - Re: [RFC PATCH] x86/debug: Dump more detailed segfault info

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Message-ID: <20161115101903.GA15249@gmail.com>
Date:   Tue, 15 Nov 2016 11:19:03 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH] x86/debug: Dump more detailed segfault info


* Borislav Petkov <bp@...en8.de> wrote:

> On Tue, Nov 15, 2016 at 07:14:47AM +0100, Ingo Molnar wrote:
> > So I think the line breaking artifact might be due to the following commit:
> > 
> >   bfd8d3f23b51 ("printk: make reading the kernel log flush pending lines")
> > 
> > ... which Linus reverted upstream a few hours ago:
> 
> Probably. I guess this doesn't happen when running my guest here because
> I have the segfault logging change ontop of -rc4.

Well, bfd8d3f23b51 was part of -rc1 already, so you have it too.

What might have made the difference is that I tested it on real hardware with 
serial logging, which delays printk() and might have created the race with the 
systemd kernel logger. (Which is impossible to turn off :-( )

Thanks,

	Ingo