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From: Ingo Molnar <mingo@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>, Jann Horn <jannh@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Alexander Potapenko <glider@google.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Andrey Konovalov <andreyknvl@google.com>,
	Andy Lutomirski <luto@kernel.org>,
	Sean Christopherson <sean.j.christopherson@intel.com>
Subject: Re: [PATCH v2 2/3] x86/traps: Print non-canonical address on #GP
Date: Wed, 20 Nov 2019 12:41:39 +0100	[thread overview]
Message-ID: <20191120114139.GB83574@gmail.com> (raw)
In-Reply-To: <20191118173850.GL6363@zn.tnic>


* Borislav Petkov <bp@alien8.de> wrote:

> On Mon, Nov 18, 2019 at 05:44:07PM +0100, Borislav Petkov wrote:
> > [    2.523708] Write protecting the kernel read-only data: 16384k
> > [    2.524729] Freeing unused kernel image (text/rodata gap) memory: 2040K
> > [    2.525594] Freeing unused kernel image (rodata/data gap) memory: 368K
> > [    2.541414] x86/mm: Checked W+X mappings: passed, no W+X pages found.
> > 
> > <--- important first splat starts here:
> > 
> > [    2.542218] [*] general protection fault while derefing a non-canonical address 0xdfff000000000001: 0000 [#1] PREEMPT SMP
> 		  ^
> 
> Btw, tglx just suggested on IRC to simply slap the die_counter number here so
> that you have
> 
> [    2.543343] [1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc8+ #8
> [    2.544138] [1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014
> ...
> 
> which also tells you to which splat the line belongs to.
>
> Also useful.

Yeah - but I think it would be even better to make it part of the 
timestamp - most tools will already discard the [] bit, so why not merge 
the two:

> [    2.543343-#1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc8+ #8
> [    2.544138-#1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1 04/01/2014

Thanks,

	Ingo

  reply	other threads:[~2019-11-20 11:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-15 19:17 [PATCH v2 1/3] x86/insn-eval: Add support for 64-bit kernel mode Jann Horn
2019-11-15 19:17 ` [PATCH v2 2/3] x86/traps: Print non-canonical address on #GP Jann Horn
2019-11-18 14:21   ` Borislav Petkov
2019-11-18 16:02     ` Dmitry Vyukov
2019-11-18 16:19       ` Jann Horn
2019-11-18 16:29         ` Dmitry Vyukov
2019-11-18 16:40           ` error attribution for stalls [was: [PATCH v2 2/3] x86/traps: Print non-canonical address on #GP] Jann Horn
2019-11-18 16:44           ` [PATCH v2 2/3] x86/traps: Print non-canonical address on #GP Borislav Petkov
2019-11-18 17:38             ` Borislav Petkov
2019-11-20 11:41               ` Ingo Molnar [this message]
2019-11-20 11:40             ` Ingo Molnar
2019-11-20 11:52               ` Borislav Petkov
2019-11-20  4:25   ` Andi Kleen
2019-11-20 10:31     ` Jann Horn
2019-11-20 13:56       ` Andi Kleen
2019-11-20 14:24         ` Jann Horn
2019-11-23 23:07   ` Andy Lutomirski
2019-11-27 20:27     ` Jann Horn
2019-11-28  5:23       ` Andy Lutomirski
2019-11-15 19:17 ` [PATCH v2 3/3] x86/kasan: Print original " Jann Horn
2019-11-18  8:36   ` Dmitry Vyukov

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