mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
	Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	Tobias Regnery <tobias.regnery@gmail.com>,
	"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
	Alexander Potapenko <glider@google.com>,
	kasan-dev <kasan-dev@googlegroups.com>,
	LKML <linux-kernel@vger.kernel.org>,
	stable <stable@vger.kernel.org>
Subject: Re: [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker.
Date: Fri, 10 Feb 2017 12:18:22 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.20.1702101217220.4036@nanos> (raw)
In-Reply-To: <CACT4Y+YnZ2FhpmxNNmzGmmOQGqrsZShStgg4n_AYx41cUVnXeQ@mail.gmail.com>

On Fri, 10 Feb 2017, Dmitry Vyukov wrote:
> This is the right thing to do per se, but I am concerned that now
> people will just suffers from slow boot (it can take literally
> minutes) and will not realize the root cause nor that it's fixable
> (e.g. with rodata=n) and will probably just blame KASAN for slowness.
> 
> Could we default this rodata check to n under KASAN? Or at least print
> some explanatory warning message before doing marking rodata (it
> should be printed right before "hang", so if you stare at it for a
> minute during each boot you realize that it may be related)? Or
> something along these lines. FWIW in my builds I just always disable
> the check.

That certainly makes sense and we emit such warnings in other places
already (lockdep, trace_printk ...)

Thanks,

	tglx

  reply	other threads:[~2017-02-10 11:34 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-09 12:46 BUG: soft lockup in 4.10-rc7 with KASAN enabled Tobias Regnery
2017-02-09 16:46 ` Paul E. McKenney
2017-02-09 16:56   ` Paul E. McKenney
2017-02-09 17:23     ` Dmitry Vyukov
2017-02-10  8:14       ` Tobias Regnery
2017-02-10  9:47 ` Andrey Ryabinin
2017-02-10  9:54   ` [PATCH] x86/mm/ptdump: Fix soft lockup in page table walker Andrey Ryabinin
2017-02-10 10:07     ` [tip:x86/urgent] " tip-bot for Andrey Ryabinin
2017-02-10 10:24     ` [PATCH] " Dmitry Vyukov
2017-02-10 11:18       ` Thomas Gleixner [this message]
2017-02-10 12:15         ` Andrey Ryabinin
2017-02-10 13:02           ` Dmitry Vyukov
2017-02-10 13:56             ` Andrey Ryabinin
2017-02-10 14:17               ` Dmitry Vyukov
2017-02-10 14:29               ` Mark Rutland
2017-02-10 14:38                 ` Andrey Ryabinin
2017-02-10 14:41                   ` Mark Rutland
2017-02-10 14:38             ` Mark Rutland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=alpine.DEB.2.20.1702101217220.4036@nanos \
    --to=tglx@linutronix.de \
    --cc=aryabinin@virtuozzo.com \
    --cc=dvyukov@google.com \
    --cc=glider@google.com \
    --cc=hpa@zytor.com \
    --cc=kasan-dev@googlegroups.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@kernel.org \
    --cc=paulmck@linux.vnet.ibm.com \
    --cc=stable@vger.kernel.org \
    --cc=tobias.regnery@gmail.com \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®