From: Sean Christopherson <seanjc@google.com>
To: Coleman Dietsch <dietschc@csp.edu>
Cc: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org, skhan@linuxfoundation.org,
Pavel Skripkin <paskripkin@gmail.com>,
linux-kernel-mentees@lists.linuxfoundation.org,
stable@vger.kernel.org,
syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com
Subject: Re: [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once
Date: Tue, 9 Aug 2022 00:32:33 +0000 [thread overview]
Message-ID: <YvGrIRlJThFoLPsb@google.com> (raw)
In-Reply-To: <20220808190607.323899-2-dietschc@csp.edu>
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@vger.kernel.org
> Link: https://syzkaller.appspot.com/bug?id=8234a9dfd3aafbf092cc5a7cd9842e3ebc45fc42
> Reported-by: syzbot+e54f930ed78eb0f85281@syzkaller.appspotmail.com
> Signed-off-by: Coleman Dietsch <dietschc@csp.edu>
> ---
Reviewed-by: Sean Christopherson <seanjc@google.com>
next prev parent reply other threads:[~2022-08-09 0:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-08 19:06 [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once Coleman Dietsch
2022-08-08 19:06 ` [PATCH v3 2/2] KVM: x86/xen: Stop Xen timer before changing IRQ Coleman Dietsch
2022-08-09 0:34 ` Sean Christopherson
2022-08-09 9:22 ` David Woodhouse
2022-08-09 12:59 ` Paolo Bonzini
2022-08-09 13:51 ` David Woodhouse
2022-08-09 14:07 ` Sean Christopherson
2022-08-09 14:16 ` David Woodhouse
2022-08-09 14:31 ` Paolo Bonzini
2022-08-09 14:36 ` David Woodhouse
2022-08-09 14:40 ` Sean Christopherson
2022-08-09 14:52 ` David Woodhouse
2022-08-09 0:32 ` Sean Christopherson [this message]
2022-08-09 12:59 ` [PATCH v3 1/2] KVM: x86/xen: Initialize Xen timer only once Paolo Bonzini
[not found] <20220808190211.323827-1-dietschc@csp.edu>
2022-08-08 19:02 ` Coleman Dietsch
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