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From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: Mike Galbraith <efault@gmx.de>
Subject: Re: [2.6.18-rc5-mm1 ACPI] Unknown exception code: 0xFFFFFFEA
Date: Tue, 5 Sep 2006 10:18:42 -0600
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References: <20060901015818.42767813.akpm@osdl.org> <1157274585.6304.6.camel@Homer.simpson.net>
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On Sunday 03 September 2006 03:09, Mike Galbraith wrote:
> My single P4/HT box tossed the below on boot.
> 
> ACPI Error (utglobal-0125): Unknown exception code: 0xFFFFFFEA [20060707]
>  [<c1004089>] dump_trace+0x1d7/0x206
>  [<c10040d2>] show_trace_log_lvl+0x1a/0x30
>  [<c100484c>] show_trace+0x12/0x14
>  [<c100496d>] dump_stack+0x19/0x1b
>  [<c1229702>] acpi_format_exception+0xa2/0xaf
>  [<c1226824>] acpi_ut_status_exit+0x2b/0x58
>  [<c1222cbc>] acpi_walk_resources+0xfd/0x109
>  [<c12393ca>] acpi_motherboard_add+0x22/0x32
>  [<c123848e>] acpi_bus_driver_init+0x2a/0x7a
>  [<c123892c>] acpi_bus_register_driver+0x8b/0xfb
>  [<c15ebd20>] acpi_motherboard_init+0xd/0xf9
>  [<c10003b1>] init+0x108/0x300
>  [<c1003c93>] kernel_thread_helper+0x7/0x14

This ACPI "unknown exception code" problem is the same one reported here:
  http://www.mail-archive.com/linux-acpi%40vger.kernel.org/msg02873.html

Basically, we just need to revert this:
  http://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc4/2.6.18-rc4-mm3/broken-out/hot-add-mem-x86_64-acpi-motherboard-fix.patch

The above patch happened to fix a hot-add memory problem, but it was
the wrong fix, and we're working out a better one.
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