New: error when loading kvm_intel module

https://bugzilla.kernel.org/show_bug.cgi?id=90381

            Bug ID: 90381
           Summary: error when loading kvm_intel module
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.18.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 161951
--> https://bugzilla.kernel.org/attachment.cgi?id=161951&action=edit
kernel crash message

Hi,
Whenever I load the kvm_intel module (on my machine which does support vmx),
the kernel crashes (not a catastropic crash but the module is no longer useable). kvm_intel is unuseable.

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--- Comment #1 from Bhasker C V <[email protected]> --- The machine (also can be found in the crash attachment) is

Dell D620 with processor features as below:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU T5500 @ 1.66GHz
stepping : 2
microcode : 0x5c
cpu MHz : 1000.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm tpr_shadow
bugs :
bogomips : 3328.70
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

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--- Comment #2 from Bhasker C V <[email protected]> ---
The 3.14.x stock kernel (of debian) works fine but 3.17.x also does the same crash. I do nott have any other kernel revisions inbetween to iterate.

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Bhasker C V <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

            Summary|error when loading          |error when loading
                   |kvm_intel module            |kvm_intel module kvm_intel
                   |                            |unuseable

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--- Comment #3 from Bhasker C V <[email protected]> --- Managed to load the kvm_intel without a crash. This crash seems to happen _only_ if nested=1 is given in the options.

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Kashyap Chamarthy <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #4 from Kashyap Chamarthy <[email protected]> --- Can't reproduce this with Kernel 3.18.1 (current upstream stable) -- tested nested virtualization with KVM. If you face issues with Debian specific Kernels, you might want to report it with Debian Kernel bug tracker.

Since this is upstream tracker, you might have to reproduce this with 3.18 (or with 3.19-rc1 mainline).

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Bhasker C V <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
Hardware|All |Intel

--- Comment #5 from Bhasker C V <[email protected]> ---
I am using 3.18.1 on my other DELL Q15R and this crash is not happening. This crash is particularly happening on the DELL D620 core2duo machines only. kvm (as per my comment above) does work fine but crashes _only_ when loaded as modprobe kvm_intel nested=1

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Bandan Das <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Blocks|                            |94971

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