WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_dummy

[Vegard Nossum]

Hi,

I just saw this warning on latest mainline when shutting down a box:

[  503.576724] ACPI: Preparing to enter system sleep state S5
[  503.710857] Disabling non-boot CPUs ...
[  503.716853] Power down.
[  503.717770] ------------[ cut here ]------------
[  503.717770] WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_du)
[  503.717770] Hardware name: OptiPlex GX100
[  503.717770] Modules linked in:
[  503.717770] Pid: 2136, comm: halt Not tainted 2.6.30 #443
[  503.717770] Call Trace:
[  503.717770]  [<c154d327>] ? printk+0x18/0x1a
[  503.717770]  [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c10360fc>] warn_slowpath_common+0x6c/0xc0
[  503.717770]  [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c1036165>] warn_slowpath_null+0x15/0x20
[  503.717770]  [<c1017358>] native_apic_write_dummy+0x38/0x50
[  503.717770]  [<c1017173>] disconnect_bsp_APIC+0x63/0x100
[  503.717770]  [<c1019e48>] disable_IO_APIC+0xb8/0xc0
[  503.717770]  [<c1214231>] ? acpi_power_off+0x0/0x29
[  503.717770]  [<c1015e55>] native_machine_shutdown+0x65/0x80
[  503.717770]  [<c1015c36>] native_machine_power_off+0x26/0x30
[  503.717770]  [<c1015c49>] machine_power_off+0x9/0x10
[  503.717770]  [<c1046596>] kernel_power_off+0x36/0x40
[  503.717770]  [<c104680d>] sys_reboot+0xfd/0x1f0
[  503.717770]  [<c109daa0>] ? perf_swcounter_event+0xb0/0x130
[  503.717770]  [<c109db7d>] ? perf_counter_task_sched_out+0x5d/0x120
[  503.717770]  [<c102dfc6>] ? finish_task_switch+0x56/0xd0
[  503.717770]  [<c154da1e>] ? schedule+0x49e/0xb40
[  503.717770]  [<c10444b0>] ? sys_kill+0x70/0x160
[  503.717770]  [<c119d9db>] ? selinux_file_ioctl+0x3b/0x50
[  503.717770]  [<c10dd443>] ? sys_ioctl+0x63/0x70
[  503.717770]  [<c1003024>] sysenter_do_call+0x12/0x22
[  503.717770] ---[ end trace 8157b5d0ed378f15 ]---
[  503.717770] acpi_power_off called

That's including this commit:

commit 103428e57be323c3c5545db8ad12667099bc6005
Author: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Date:   Sun Jun 7 16:48:40 2009 +0400

    x86, apic: Fix dummy apic read operation together with broken MP handling


Vegard
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