linux-kernel - Re: kvm: GPF in kvm_lapic_latched

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Date:	Wed, 22 Jun 2016 10:46:26 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>, KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, mtosatti@...hat.com,
	yoshikawa_takuya_b1@....ntt.co.jp, guangrong.xiao@...ux.intel.com,
	Eric Northup <digitaleric@...gle.com>,
	Andrew Honig <ahonig@...gle.com>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: kvm: GPF in kvm_lapic_latched_init



On 22/06/2016 10:38, Dmitry Vyukov wrote:
> On Wed, Jun 22, 2016 at 10:36 AM, Paolo Bonzini <pbonzini@...hat.com> wrote:
>> On 22/06/2016 10:20, Dmitry Vyukov wrote:
>>>>>>> All crashes suggest that apic is NULL.
>>>>>>>
>>>>>>> On commit b06f3a168cdcd80026276898fd1fee443ef25743 (Jan 6).
>>>
>>> Ping. Just hit it again on 67016f6cdfd079e632bbc49e33178b2d558c120a (Jun 20):
>>
>> This might have been the same bug you reported yesterday in kvm_set_cr8.
>>  I've sent a patch to fix static keys.
> 
> Then it is probably the same as the following one as well?

Not 100% sure, can you send the reproducer?

Paolo

> WARNING: CPU: 3 PID: 23379 at kernel/sched/core.c:2583[<      none
>  >] preempt_notifier_register+0x2b/0x120 kernel/sched/core.c:2583
> registering preempt_notifier while notifiers disabled
> Modules linked in:
> CPU: 3 PID: 23379 Comm: syz-executor Not tainted 4.7.0-rc4+ #2
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>  ffffffff880b58e0 ffff88003a79fa60 ffffffff82cc62cf ffffffff81495e98
>  fffffbfff1016b1c ffff88003a79fad8 0000000000000000 ffffffff86ca0220
>  ffffffff813ed78b 0000000000000009 ffff88003a79faa8 ffffffff8136d27f
> Call Trace:
>  [<     inline     >] __dump_stack lib/dump_stack.c:15
>  [<ffffffff82cc62cf>] dump_stack+0x12e/0x18f lib/dump_stack.c:51
>  [<ffffffff8136d27f>] __warn+0x19f/0x1e0 kernel/panic.c:516
>  [<ffffffff8136d36c>] warn_slowpath_fmt+0xac/0xd0 kernel/panic.c:531
>  [<ffffffff813ed78b>] preempt_notifier_register+0x2b/0x120
> kernel/sched/core.c:2583
>  [<ffffffff81067d96>] vcpu_load+0x46/0x70
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:146
>  [<ffffffff810b933f>] kvm_arch_vcpu_setup+0x1f/0x60 arch/x86/kvm/x86.c:7390
>  [<     inline     >] kvm_vm_ioctl_create_vcpu
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2355
>  [<ffffffff8106b9f2>] kvm_vm_ioctl+0x582/0x10d0
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2839
>  [<     inline     >] vfs_ioctl fs/ioctl.c:43
>  [<ffffffff818510bc>] do_vfs_ioctl+0x18c/0xff0 fs/ioctl.c:674
>  [<     inline     >] SYSC_ioctl fs/ioctl.c:689
>  [<ffffffff81851faf>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:680
>  [<ffffffff86a97000>] entry_SYSCALL_64_fastpath+0x23/0xc1
> arch/x86/entry/entry_64.S:207
> ---[ end trace c0e5c1ad551a4947 ]---
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