linux-kernel - Re: [PATCH] KVM: VMX: fix rcu usage warning

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Message-ID: <4C0DFB21.7050309@redhat.com>
Date:	Tue, 08 Jun 2010 11:11:13 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: VMX: fix rcu usage warning

On 06/08/2010 05:15 AM, Xiao Guangrong wrote:
> fix:
>
> [ INFO: suspicious rcu_dereference_check() usage. ]
> ---------------------------------------------------
> include/linux/kvm_host.h:258 invoked rcu_dereference_check() without protection!
>
> other info that might help us debug this:
>
>
> rcu_scheduler_active = 1, debug_locks = 1
> 1 lock held by qemu-system-x86/3796:
>   #0:  (&vcpu->mutex){+.+.+.}, at: [<ffffffffa0217fd8>] vcpu_load+0x1a/0x66 [kvm]
>
> stack backtrace:
> Pid: 3796, comm: qemu-system-x86 Not tainted 2.6.34 #25
> Call Trace:
>   [<ffffffff81070ed1>] lockdep_rcu_dereference+0x9d/0xa5
>   [<ffffffffa0214fdf>] gfn_to_memslot_unaliased+0x65/0xa0 [kvm]
>   [<ffffffffa0216139>] gfn_to_hva+0x22/0x4c [kvm]
>   [<ffffffffa0216217>] kvm_write_guest_page+0x2a/0x7f [kvm]
>   [<ffffffffa0216286>] kvm_clear_guest_page+0x1a/0x1c [kvm]
>   [<ffffffffa0278239>] init_rmode+0x3b/0x180 [kvm_intel]
>   [<ffffffffa02786ce>] vmx_set_cr0+0x350/0x4d3 [kvm_intel]
>   [<ffffffffa02274ff>] kvm_arch_vcpu_ioctl_set_sregs+0x122/0x31a [kvm]
>   [<ffffffffa021859c>] kvm_vcpu_ioctl+0x578/0xa3d [kvm]
>   [<ffffffff8106624c>] ? cpu_clock+0x2d/0x40
>   [<ffffffff810f7d86>] ? fget_light+0x244/0x28e
>   [<ffffffff810709b9>] ? trace_hardirqs_off_caller+0x1f/0x10e
>   [<ffffffff8110501b>] vfs_ioctl+0x32/0xa6
>   [<ffffffff81105597>] do_vfs_ioctl+0x47f/0x4b8
>   [<ffffffff813ae654>] ? sub_preempt_count+0xa3/0xb7
>   [<ffffffff810f7da8>] ? fget_light+0x266/0x28e
>   [<ffffffff810f7c53>] ? fget_light+0x111/0x28e
>   [<ffffffff81105617>] sys_ioctl+0x47/0x6a
>   [<ffffffff81002c1b>] system_call_fastpath+0x16/0x1b
>
>    

Applied, thanks.

-- 
error compiling committee.c: too many arguments to function

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