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Subject: RE: [ACPI] ACPI and PRREMPT bug
Date: Mon, 7 Nov 2005 12:42:18 -0800
Message-ID: <971FCB6690CD0E4898387DBF7552B90E0356B620@orsmsx403.amr.corp.intel.com>
Thread-Topic: [ACPI] ACPI and PRREMPT bug
thread-index: AcXjg0GaU/Dpay1hTuqB9AuCdXtwLgAWG4sA
From: "Moore, Robert" <robert.moore@intel.com>
To: <tzachar@cs.bgu.ac.il>, <linux-kernel@vger.kernel.org>,
       <acpi-devel@lists.sourceforge.net>
Sender: linux-kernel-owner@vger.kernel.org
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Lines: 82

I'm aware of this issue and it is under investigation.
Bob


> -----Original Message-----
> From: acpi-devel-admin@lists.sourceforge.net [mailto:acpi-devel-
> admin@lists.sourceforge.net] On Behalf Of Nir Tzachar
> Sent: Monday, November 07, 2005 1:36 AM
> To: linux-kernel@vger.kernel.org; acpi-devel@lists.sourceforge.net
> Subject: [ACPI] ACPI and PRREMPT bug
> 
> hello.
> 
> I'm encountering a problem with acpi on kernels where preempt is
> enabled.
> The problem is 100% reproducible on all kernels starting from 2.6.12.1
> to 2.6.14
> ( i didn't try 2.6.11 and below ).
> 
> the problem is manifested via the battery proc interface. to produce
it,
> run in two terminals simultaneously:
> while true; do cat /proc/acpi/battery/BAT0/info; done
> 
> if i turn on kernel preemption (either voluntary or not), i get the
> following error messages in dmesg:
> Nov  7 08:31:00 lapnir ACPI-0292: *** Error: Looking up [SERN] in
> namespace, AE_ALREADY_EXISTS
> Nov  7 08:31:00 lapnir ACPI-0508: *** Error: Method execution failed
> [\_SB_.PCI0.LPC_.EC__.GBIF] (Node c18f5d60), AE_ALREADY_EXISTS
> Nov  7 08:31:02 lapnir ACPI-0213: *** Error: Method reached maximum
> reentrancy limit (255)
> Nov  7 08:31:02 lapnir ACPI-0508: *** Error: Method execution failed
> [\_SB_.PCI0.LPC_.EC__.BAT0._BIF] (Node c18f5c20), AE_AML_METHOD_LIMIT
> 
> and with acpi debugging info turned on:
> Nov  7 08:46:08 lapnir dswload-0292: *** Error: Looking up [SERN] in
> namespace, AE_ALREADY_EXISTS
> Nov  7 08:46:08 lapnir psloop-0287 [4399] ps_parse_loop         :
During
> name lookup/catalog, AE_ALREADY_EXISTS
> Nov  7 08:46:08 lapnir psparse-0508: *** Error: Method execution
failed
> [\_SB_.PCI0.LPC_.EC__.GBIF] (Node c18f94e8), AE_ALREADY_EXISTS
> Nov  7 08:46:08 lapnir osl-0856 [4403] os_wait_semaphore     : Failed
to
> acquire semaphore[c18de5e0|1|0], AE_TIME
> Nov  7 08:46:08 lapnir dsmethod-0213: *** Error: Method reached
maximum
> reentrancy limit (255)
> Nov  7 08:46:08 lapnir psparse-0508: *** Error: Method execution
failed
> [\_SB_.PCI0.LPC_.EC__.BAT0._BIF] (Node c18f9268), AE_AML_METHOD_LIMIT
> Nov  7 08:46:08 lapnir acpi_battery-0144 [4449] battery_get_info
:
> Error evaluating _BIF
> Nov  7 08:46:08 lapnir dsmethod-0213: *** Error: Method reached
maximum
> reentrancy limit (255)
> Nov  7 08:46:08 lapnir psparse-0508: *** Error: Method execution
failed
> [\_SB_.PCI0.LPC_.EC__.BAT0._BIF] (Node c18f9268), AE_AML_METHOD_LIMIT
> 
> 
> this is repeated until a reboot. loading and unloading the battery
> module does not help.
> 
> My computer is a thinkpad t43p, and i didn't try to reproduce it on
> another laptop
> (have no access to another model..).
> If you need more info, let me know.
> 
> p.s. please cc me, im not in the list.
> 
> --
> =========================================================
> Nir Tzachar.
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