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Date: Tue, 9 Aug 2022 14:59:34 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Sean Christopherson <seanjc@...gle.com>, Coleman Dietsch <dietschc@....edu> Cc: kvm@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org, skhan@...uxfoundation.org, Pavel Skripkin <paskripkin@...il.com>, linux-kernel-mentees@...ts.linuxfoundation.org, stable@...r.kernel.org, syzbot+e54f930ed78eb0f85281@...kaller.appspotmail.com Subject: Re: [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once On 8/9/22 02:32, Sean Christopherson wrote: > On Mon, Aug 08, 2022, Coleman Dietsch wrote: >> Add a check for existing xen timers before initializing a new one. >> >> Currently kvm_xen_init_timer() is called on every >> KVM_XEN_VCPU_ATTR_TYPE_TIMER, which is causing the following ODEBUG >> crash when vcpu->arch.xen.timer is already set. >> >> ODEBUG: init active (active state 0) >> object type: hrtimer hint: xen_timer_callbac0 >> RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502 >> Call Trace: >> __debug_object_init >> debug_hrtimer_init >> debug_init >> hrtimer_init >> kvm_xen_init_timer >> kvm_xen_vcpu_set_attr >> kvm_arch_vcpu_ioctl >> kvm_vcpu_ioctl >> vfs_ioctl >> >> Fixes: 536395260582 ("KVM: x86/xen: handle PV timers oneshot mode") >> Cc: stable@...r.kernel.org >> Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42 >> Reported-by: syzbot+e54f930ed78eb0f85281@...kaller.appspotmail.com >> Signed-off-by: Coleman Dietsch <dietschc@....edu> >> --- > > Reviewed-by: Sean Christopherson <seanjc@...gle.com> > Queued both (pending resolution of David's question), thanks. Paolo
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