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Mon, 18 Mar 2024 12:55:44 -0700 (PDT) Date: Mon, 18 Mar 2024 12:55:43 -0700 In-Reply-To: <0000000000005fa5cc0613f1cebd@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <0000000000005fa5cc0613f1cebd@google.com> Message-ID: Subject: Re: [syzbot] [kvm?] WARNING in __kvm_gpc_refresh From: Sean Christopherson To: syzbot Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, pbonzini@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="us-ascii" On Mon, Mar 18, 2024, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 277100b3d5fe Merge tag 'block-6.9-20240315' of git://git.k.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17c96aa5180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=1c6662240382da2 > dashboard link: https://syzkaller.appspot.com/bug?extid=106a4f72b0474e1d1b33 > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14358231180000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=110ed231180000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-277100b3.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6872e049b27c/vmlinux-277100b3.xz > kernel image: https://storage.googleapis.com/syzbot-assets/68ec7230df0f/bzImage-277100b3.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+106a4f72b0474e1d1b33@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 5192 at arch/x86/kvm/../../../virt/kvm/pfncache.c:247 __kvm_gpc_refresh+0x15e2/0x2200 arch/x86/kvm/../../../virt/kvm/pfncache.c:247 The WARN is due to a new sanity check that exposed an old wart. I'll get a patch posted later today.