Package: src:linux
Version: 3.15~rc7-1~exp1
Severity: normal
Dear Maintainer,
some seconds or minutes after waking up from suspend to disk after the NMI
watchdog has been disabled (e.g. with powertop or with echo 0
/proc/sys/kernel/nmi_watchdog) before suspend, I get the following message
from the kernel:
Uhhuh. NMI received for unknown reason 2c on CPU 0.
Do you have a strange power saving mode enabled?
Dazed and confused, but trying to continue
The exact timing seems to differ from run to run. The problem seems to be
identical to the problem reported here:
http://linux-kernel.2935.n7.nabble.com/Uhhuh-NMI-received-for-unknown-reason-2c-on-CPU-0-tp591524p628729.html
Please note that the linked thread is interleaved with an independent e1000
networking problem. The NMI problem seems to be unrelated from e1000 there
and it definitely is unrelated here, as no e1000 is loaded or plugged-in.
I only tested 3.15, RC7, but I guess, that the problem occurs with older
kernels, too, and that I didn't see it before, as I just recently switched
the aforementioned watchdog option. I can test different kernels if this
helps, but as the kernels works without any obvious problems, I haven't done
this, yet.
The end of a restore from disk run looks like the following:
[29240.016685] PM: restore of devices complete after 2379.959 msecs
[29240.017030] PM: Image restored successfully.
[29240.017063] PM: Basic memory bitmaps freed
[29240.017064] Restarting tasks ... done.
[29423.719271] Uhhuh. NMI received for unknown reason 2c on CPU 0.
[29423.719281] Do you have a strange power saving mode enabled?
[29423.719286] Dazed and confused, but trying to continue
Another, more detailed run, looks as follows:
[ 69.624048] PM: Hibernation mode set to 'platform'
[ 69.969074] (NULL device *): firmware: direct-loading firmware
amd-ucode/microcode_amd.bin
[ 69.969114] PM: Syncing filesystems ... done.
[ 70.385415] Freezing user space processes ... (elapsed 0.001 seconds) done.
[ 70.387587] PM: Marking nosave pages: [mem 0x00098000-0x000f]
[ 70.387600] PM: Marking nosave pages: [mem 0xdff9-0x]
[ 70.388839] PM: Marking nosave pages: [mem 0xd400-0xd7ff]
[ 70.389642] PM: Basic memory bitmaps created
[ 70.389699] PM: Preallocating image memory... done (allocated 218996 pages)
[ 71.123610] PM: Allocated 875984 kbytes in 0.73 seconds (1199.97 MB/s)
[ 71.123612] Freezing remaining freezable tasks ... (elapsed 0.001 seconds)
done.
[ 71.125251] Suspending console(s) (use no_console_suspend to debug)
[ 71.175132] PM: freeze of devices complete after 49.868 msecs
[ 71.176441] PM: late freeze of devices complete after 1.304 msecs
[ 71.177795] PM: noirq freeze of devices complete after 1.350 msecs
[ 71.179148] ACPI: Preparing to enter system sleep state S4
[ 71.180007] PM: Saving platform NVS memory
[ 71.180527] Disabling non-boot CPUs ...
[ 71.182262] kvm: disabling virtualization on CPU1
[ 71.282478] smpboot: CPU 1 is now offline
[ 71.284767] kvm: disabling virtualization on CPU2
[ 71.284775] smpboot: CPU 2 is now offline
[ 71.286771] kvm: disabling virtualization on CPU3
[ 71.286823] smpboot: CPU 3 is now offline
[ 71.288525] kvm: disabling virtualization on CPU4
[ 71.390451] smpboot: CPU 4 is now offline
[ 71.392044] kvm: disabling virtualization on CPU5
[ 71.494456] smpboot: CPU 5 is now offline
[ 71.494801] PM: Creating hibernation image:
[ 71.667480] PM: Need to copy 220062 pages
[ 71.667481] PM: Normal pages needed: 220062 + 1024, available pages: 2908835
[ 71.495930] PM: Restoring platform NVS memory
[ 71.496021] PCI-DMA: Resuming GART IOMMU
[ 71.496021] PCI-DMA: Restoring GART aperture settings
[ 71.496195] LVT offset 1 assigned for vector 0x400
[ 71.496203] IBS: LVT offset 1 assigned
[ 71.496274] Enabling non-boot CPUs ...
[ 71.496382] x86: Booting SMP configuration:
[ 71.496383] smpboot: Booting Node 0 Processor 1 APIC 0x1
[ 71.507336] kvm: enabling virtualization on CPU1
[ 71.509428] process: Switch to broadcast mode on CPU1
[ 71.509647] CPU1 is up
[ 71.509701] smpboot: Booting Node 0 Processor 2 APIC 0x2
[ 71.520653] kvm: enabling virtualization on CPU2
[ 71.522741] process: Switch to broadcast mode on CPU2
[ 71.522914] CPU2 is up
[ 71.522976] smpboot: Booting Node 0 Processor 3 APIC 0x3
[ 71.533929] kvm: enabling virtualization on CPU3
[ 71.536031] process: Switch to broadcast mode on CPU3
[ 71.536208] CPU3 is up
[ 71.536270] smpboot: Booting Node 0 Processor 4 APIC 0x4
[ 71.547221] kvm: enabling virtualization on CPU4
[ 71.549333] process: Switch to broadcast mode on CPU4
[ 71.549510] CPU4 is up
[ 71.549574] smpboot: Booting Node 0 Processor 5 APIC 0x5
[ 71.560527] kvm: enabling virtualization on CPU5
[ 71.562615] process: Switch to broadcast mode on CPU5
[ 71.562789] CPU5 is up
[ 71.569418] ACPI: Waking up from system sleep state S4
[ 71.584196] PM: noirq restore of devices complete
