From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 55201] host panic when "creating guest, doing scp and killing
QEMU process" continuously
Date: Sun, 7 Apr 2013 02:19:14 +0000 (UTC)
Message-ID: <20130407021914.0FAA011F981@bugzilla.kernel.org>
References:
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
To: kvm@vger.kernel.org
Return-path:
Received: from mail.kernel.org ([198.145.19.201]:55706 "EHLO mail.kernel.org"
rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
id S1161185Ab3DGCTT (ORCPT );
Sat, 6 Apr 2013 22:19:19 -0400
Received: from mail.kernel.org (localhost [127.0.0.1])
by mail.kernel.org (Postfix) with ESMTP id 9F74720202
for ; Sun, 7 Apr 2013 02:19:17 +0000 (UTC)
Received: from bugzilla.kernel.org (bugzilla.kernel.org [198.145.19.217])
by mail.kernel.org (Postfix) with ESMTP id 1E480201EE
for ; Sun, 7 Apr 2013 02:19:15 +0000 (UTC)
In-Reply-To:
Sender: kvm-owner@vger.kernel.org
List-ID:
https://bugzilla.kernel.org/show_bug.cgi?id=55201
Jay Ren changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |CODE_FIX
--- Comment #8 from Jay Ren 2013-04-07 02:19:13 ---
I verified this against the latest kvm.git tree (next branch).
The following commit fixed this bug.
commit c09664bb44184b3846e8c5254db4eae4b932682a
Author: Marcelo Tosatti
Date: Mon Mar 18 13:54:32 2013 -0300
KVM: x86: fix deadlock in clock-in-progress request handling
There is a deadlock in pvclock handling:
cpu0: cpu1:
kvm_gen_update_masterclock()
kvm_guest_time_update()
spin_lock(pvclock_gtod_sync_lock)
local_irq_save(flags)
spin_lock(pvclock_gtod_sync_lock)
kvm_make_mclock_inprogress_request(kvm)
make_all_cpus_request()
smp_call_function_many()
Now if smp_call_function_many() called by cpu0 tries to call function on
cpu1 there will be a deadlock.
Fix by moving pvclock_gtod_sync_lock protected section outside irq
disabled section.
Analyzed by Gleb Natapov
Acked-by: Gleb Natapov
Reported-and-Tested-by: Yongjie Ren
Signed-off-by: Marcelo Tosatti
--
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.