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Date: Tue, 11 Dec 2007 18:44:43 +0100
From: Borislav Petkov <bbpetkov@yahoo.de>
To: Andrew Morton <akpm@linux-foundation.org>, len.brown@intel.com,
       Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: 2.6.24-rc4-mm1: acpi reboots machine... solved
Message-ID: <20071211174443.GA5013@gollum.tnic>
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	Andrew Morton <akpm@linux-foundation.org>, len.brown@intel.com,
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On Sun, Dec 09, 2007 at 10:19:47AM +0100, Borislav Petkov wrote:
> On Sun, Dec 09, 2007 at 08:50:02AM +0100, Borislav Petkov wrote:
> > Hi Andrew,
> > Hi Len,
> > 
> > after booting 2.6.24-rc4-mm1 (2.6.24-rc4-190-g94545ba, otoh, boots just
> > fine) on my asus laptop, the machine reboots after claiming that
> > "Critical temperature reached (255 C)." However, the degrees number
> > is kinda hinting at 0xff all-ones field. Will try dump_stack in
> > acpi_thermal_critical() to checkout the call path. For now here's the netconsole bootlog:
> 
> Here's what i got so far:
> 
> [   50.287939] Pid: 1, comm: swapper Not tainted 2.6.24-rc4-mm1 #14
> [   50.287999]  [<c0104b65>] show_trace_log_lvl+0x12/0x25
> [   50.288103]  [<c01053e7>] show_trace+0xd/0x10
> [   50.288202]  [<c0105a6c>] dump_stack+0x57/0x5f
> [   50.288303]  [<c021c991>] acpi_thermal_check+0x150/0x3bb
> [   50.288415]  [<c021d4b3>] acpi_thermal_add+0x261/0x2cf
> [   50.288515]  [<c0213549>] acpi_device_probe+0x3e/0xdb
> [   50.288615]  [<c023f8f5>] driver_probe_device+0xaf/0x12a
> [   50.288717]  [<c023fa88>] __driver_attach+0x6c/0xa5
> [   50.288817]  [<c023ee5a>] bus_for_each_dev+0x3e/0x60
> [   50.288916]  [<c023f77d>] driver_attach+0x14/0x16
> [   50.289015]  [<c023f5a6>] bus_add_driver+0xa6/0x1a8
> [   50.289114]  [<c023fc53>] driver_register+0x42/0x47
> [   50.289214]  [<c02138c2>] acpi_bus_register_driver+0x3a/0x3c
> [   50.289316]  [<c044306b>] acpi_thermal_init+0x57/0x76
> [   50.289424]  [<c04344a7>] kernel_init+0x138/0x280
> [   50.289525]  [<c01047df>] kernel_thread_helper+0x7/0x10
> [   50.289625]  =======================
> [   50.289680] ACPI: Critical trip point
> [   50.289736] Critical temperature reached (255 C), shutting down.
> 
> so in acpi_thermal_get_temperature() called in acpi_thermal_add() the
> tz->temperature thingy is not set properly (printk's added):
> 
> [   50.276607] Old temp: 4294967023
> [   50.281890] Got temp: 255
> [   50.282567] Old temp: 255
> [   50.287882] Got temp: 255
> 
> What's also strange is that the tz acpi_thermal is alloc'd with kzalloc and
> there's still garbage in it after reading it in acpi_thermal_get_temperature()
> for the first time. Debugging continues...

(i almost suspected that the problem might be something completely different.)
well, after bisecting the rc4-mm1 tree for a whole day today, the evildoer
turned out to be

broken-out/pnp-request-ioport-and-iomem-resources-used-by-active-devices.patch.

After backing this one out, mm1 boots just fine here.
-- 
Regards/Gru?,
    Boris.
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