Re: [KVM] BUG: unable to handle kernel NULL pointer dereference at 00000000000002b0

[Paolo Bonzini]

Il 26/03/2014 15:40, Fengguang Wu ha scritto:
> Hi Paolo,
>
> We noticed the below kernel BUG on
>
> git://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
> commit 93c4adc7afedf9b0ec190066d45b6d67db5270da ("KVM: x86: handle missing MPX in nested virtualization")

Ouch.  Out of curiosity is this on Skylake prototypes, or is it also 
visible on some released silicon?

I'm sending a patch to kvm@xxxxxxxxxxxxxxx and CCing you---would be nice 
to have your Tested-by.

Thanks,

Paolo

> [   17.665744] Freeing initrd memory: 213444K (ffff880072f82000 - ffff88007fff3000)
> [   17.674933] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
> [   17.682659] software IO TLB [mem 0xb73c7000-0xbb3c7000] (64MB) mapped at [ffff8800b73c7000-ffff8800bb3c6fff]
> [   17.695661] BUG: unable to handle kernel NULL pointer dereference at 00000000000002b0
> [   17.705465] IP: [<ffffffff81015a9f>] kvm_arch_init+0x12a/0x1ea
> [   17.712577] PGD 0
> [   17.715390] Oops: 0000 [#1] SMP
> [   17.719654] Modules linked in:
> [   17.723641] CPU: 10 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc7-03020-ga929a7d #1
> [   17.733067] Hardware name: Intel Corporation LH Pass/S4600LH...., BIOS SE5C600.86B.99.02.1047.032320122259 03/23/2012
> [   17.745821] task: ffff880429cb0000 ti: ffff880429ca4000 task.ti: ffff880429ca4000
> [   17.755039] RIP: 0010:[<ffffffff81015a9f>]  [<ffffffff81015a9f>] kvm_arch_init+0x12a/0x1ea
> [   17.765228] RSP: 0000:ffff880429ca5e00  EFLAGS: 00010246
> [   17.771644] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> [   17.780096] RDX: 0000000000000000 RSI: ffff880429ca5e04 RDI: 0000000000000d90
> [   17.788549] RBP: ffff880429ca5e30 R08: ffff88082fc55d00 R09: ffff88042f803e00
> [   17.796993] R10: 0000000000000004 R11: 0000000000000003 R12: 000000000000000c
> [   17.805449] R13: 0000000000000017 R14: ffffffff82018b10 R15: 0000000000000018
> [   17.813907] FS:  0000000000000000(0000) GS:ffff88082fc40000(0000) knlGS:0000000000000000
> [   17.823808] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   17.830693] CR2: 00000000000002b0 CR3: 000000000200f000 CR4: 00000000000407e0
> [   17.839159] Stack:
> [   17.841873]  0000000000000000 0000000000000040 0000000000000000 0000000000003f40
> [   17.851328]  0000000000000000 0000000000000000 ffff880429ca5e68 ffffffff810039dc
> [   17.860790]  00000000000164d8 0000000000000006 0000000000000000 000000000000023c
> [   17.870256] Call Trace:
> [   17.873468]  [<ffffffff810039dc>] kvm_init+0x1f/0x24a
> [   17.879599]  [<ffffffff82154fa4>] vmx_init+0x1df/0x3f6
> [   17.885825]  [<ffffffff82154dc5>] ? vmx_check_processor_compat+0x61/0x61
> [   17.893782]  [<ffffffff810002d2>] do_one_initcall+0xa4/0x13a
> [   17.900604]  [<ffffffff810f9aa9>] ? parse_args+0x25f/0x33d
> [   17.907225]  [<ffffffff8214ff94>] kernel_init_freeable+0x1a9/0x22e
> [   17.914615]  [<ffffffff8214f78f>] ? do_early_param+0x88/0x88
> [   17.921433]  [<ffffffff819af0d5>] ? rest_init+0x89/0x89
> [   17.927731]  [<ffffffff819af0e3>] kernel_init+0xe/0xdf
>
> Full dmesg is attached, and more details can be provided on your request.
>
> Thanks,
> Fengguang

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