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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