All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ingo Molnar <mingo@elte.hu>
To: Mike Travis <travis@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Hugh Dickins <hugh@veritas.com>, Jack Steiner <steiner@sgi.com>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [crash] Re: [PATCH 0/4] x86_64: Optimize percpu accesses
Date: Mon, 28 Jul 2008 17:52:48 +0200	[thread overview]
Message-ID: <20080728155248.GA7123@elte.hu> (raw)
In-Reply-To: <20080725211117.586723000@polaris-admin.engr.sgi.com>


ok, i have integrated tip/x86/percpu-zerobased into tip/master briefly, 
but it blew up almost immediately in testing, on two boxes.

one bad config is:

  http://redhat.com/~mingo/misc/config-Mon_Jul_28_17_35_00_CEST_2008.bad

failure pattern: it booted up fine to userspace and seemed function, but 
then produced a spontaneous reboot while building a kernel, without any 
log entries.

other bad config is:

  http://redhat.com/~mingo/misc/config-Mon_Jul_28_17_30_39_CEST_2008.bad

failure pattern: early crash at:

  PANIC: early exception 0e rip 10:fffffff817dfc1a error 0 cr2 28

which corresponds to:

ffffffff817dfc0f <machine_specific_memory_setup>:
ffffffff817dfc0f:       48 8b 05 aa cf 04 00    mov    315306(%rip),%rax
# ffffffff8182cbc0 <x86_quirks>
ffffffff817dfc16:       55                      push   %rbp
ffffffff817dfc17:       48 89 e5                mov    %rsp,%rbp
ffffffff817dfc1a:       48 8b 40 28             mov    0x28(%rax),%rax  [*]
ffffffff817dfc1e:       48 85 c0                test   %rax,%rax

i.e. RAX was zero.

i've pushed out the tip/tmp.x86/percpu-zerobased.bad branch which shows 
the exact kernel that failed. It was generated by:

 git-checkout tip/master
 git-merge tip/x86/percpu-zerobased

	Ingo

  parent reply	other threads:[~2008-07-28 15:53 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-07-25 21:11 [PATCH 0/4] x86_64: Optimize percpu accesses Mike Travis
2008-07-25 21:11 ` [PATCH 1/4] x86_64: Cleanup early setup_percpu references Mike Travis
2008-07-25 21:11 ` [PATCH 2/4] x86_64: Base percpu variables at zero Mike Travis
2008-07-25 21:11 ` [PATCH 3/4] x86_64: Fold pda into per cpu area Mike Travis
2008-07-25 21:11 ` [PATCH 4/4] x86_64: Reference zero-based percpu variables offset from gs Mike Travis
2008-07-25 23:26 ` [PATCH 0/4] x86_64: Optimize percpu accesses Jeremy Fitzhardinge
2008-07-26  0:27   ` Mike Travis
2008-07-26  0:30     ` Jeremy Fitzhardinge
2008-07-26 12:38 ` Ingo Molnar
2008-07-28 18:33   ` Mike Travis
2008-07-28 15:52 ` Ingo Molnar [this message]
2008-07-28 19:39   ` [crash] " Mike Travis

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=20080728155248.GA7123@elte.hu \
    --to=mingo@elte.hu \
    --cc=akpm@linux-foundation.org \
    --cc=ebiederm@xmission.com \
    --cc=hpa@zytor.com \
    --cc=hugh@veritas.com \
    --cc=jeremy@goop.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=steiner@sgi.com \
    --cc=tglx@linutronix.de \
    --cc=travis@sgi.com \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.