linux-kernel - Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for 64-bit Xen support

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Date:	Tue, 1 Jul 2008 11:21:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Nick Piggin <npiggin@...e.de>, Mark McLoughlin <markmc@...hat.com>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Stephen Tweedie <sct@...hat.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [Xen-devel] Re: [PATCH 00 of 36] x86/paravirt: groundwork for
	64-bit Xen support


* Ingo Molnar <mingo@...e.hu> wrote:

> great - i've applied your fix and re-integrated x86/xen-64bit, it's 
> under testing now. (no problems so far)

hm, -tip testing still triggers a 64-bit bootup crash:

[    0.000000] init_memory_mapping
[    0.000000] kernel direct mapping tables up to 3fff0000 @ 8000-a000
PANIC: early exception 0e rip 10:ffffffff80418f81 error 0 cr2 ffffffffff300000
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.26-rc8-tip #13363
[    0.000000]
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff807f088b>] ? init_memory_mapping+0x341/0x56b
[    0.000000]  [<ffffffff80dba19f>] early_idt_handler+0x5f/0x73
[    0.000000]  [<ffffffff80418f81>] ? __memcpy_fromio+0xd/0x1e
[    0.000000]  [<ffffffff80de238a>] dmi_scan_machine+0x41/0x19b
[    0.000000]  [<ffffffff80dbeba8>] setup_arch+0x46d/0x5d8
[    0.000000]  [<ffffffff802896a0>] ? kernel_text_unlock+0x10/0x12
[    0.000000]  [<ffffffff80263b86>] ? raw_notifier_chain_register+0x9/0xb
[    0.000000]  [<ffffffff80dba140>] ? early_idt_handler+0x0/0x73
[    0.000000]  [<ffffffff80dbac5a>] start_kernel+0xf4/0x3b3
[    0.000000]  [<ffffffff80dba140>] ? early_idt_handler+0x0/0x73
[    0.000000]  [<ffffffff80dba2a4>] x86_64_start_reservations+0xa9/0xad
[    0.000000]  [<ffffffff80dba3b8>] x86_64_start_kernel+0x110/0x11f
[    0.000000]

  http://redhat.com/~mingo/misc/crash.log-Tue_Jul__1_10_55_47_CEST_2008.bad
  http://redhat.com/~mingo/misc/config-Tue_Jul__1_10_55_47_CEST_2008.bad

Excluding the x86/xen-64bit topic solves the problem.

It triggered on two 64-bit machines so it seems readily reproducible 
with that config.

i've pushed the failing tree out to tip/tmp.xen-64bit.Tue_Jul__1_10_55

	Ingo

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