I'm aware of this issue and it is under investigation.
Bob
> -----Original Message-----
> From: [email protected] [mailto:acpi-devel-
> [email protected]] On Behalf Of Nir Tzachar
> Sent: Monday, November 07, 2005 1:36 AM
> To: [email protected]; [email protected]
> 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.