port-i386/44409: 5.1/i386 panics in halt -p

[Jukka Ruohonen <jruohonen%iki.fi@localhost>]

>Number:         44409
>Category:       port-i386
>Synopsis:       5.1/i386 panics in halt -p
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 18 14:15:00 +0000 2011
>Originator:     Jukka Ruohonen
>Release:        NetBSD 5.1_STABLE
>Organization:
-
>Environment:
Architecture: i386
Machine: i386

>Description:

NetBSD 5.1 panics during halt -p:

panic: cpu_switchto: switching above IPL_SCHED(8)

syscall(...
sys_reboot(...
cpu_reboot(...
acpi_enter_sleep_state(...
AcpiEnterSleepStatePrep(...
AcpiEvaluateObject(...
AcpiNsEvaluate(...
AcpiPsExecuteMethod(...
AcpiPSParseAml(...
AcpiPsParseLoop(...
AcpiDsExecEndOp(...
AcpiDsEvaluateNamePath(...
AcpiExResolveToValue(...
AcpiExReadDataFromField(...
AcpiExExtractFromField(...
AcpiExFieldDatumIo(...
AcpiExAccessRegion(...
AcpiEvAddressSpaceDispatch(...
acpiec_space_handler(...
cv_timedwait(...
sleep_block(...
cpu_switchto(...
panic(...

This is another locking error. Something is dispatched to the EC,
acpiec(4) does not detect that we are in a middle of powerdown, and uses
condvar(9).

>How-To-Repeat:

halt -p

>Fix:

Not yet investigated.