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AJvYcCVahZ8KjrIZcd7rQ02+HWHSfy/HQtv9GakKKyjePf+fRoNvdySBrEkEg2XdzYvbIjINChg=@vger.kernel.org X-Gm-Message-State: AOJu0Yxb+WC9wovPE+9wwKBA2f10i2E+NJPa2NV5BEBbDOL61aNHycgf z06UVhDmLfv/ybTIoim27yEubHRqoYTwVCtfkcbxq2z0dN7H39AQ9UgaOXAgdpBzYBtMTHHw8S5 w6wcduw== X-Google-Smtp-Source: AGHT+IGKxEq/h6VGvllulb+B19zVX8xyn3ukqgkbd5wdwUs0a5DqFBozKOKBvbhqQGpTHmL6bvsTT7LiEXI= X-Received: from pjbsn8.prod.google.com ([2002:a17:90b:2e88:b0:311:6040:2c7a]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:5624:b0:312:e744:5b76 with SMTP id 98e67ed59e1d1-31c9e78b84cmr12238484a91.33.1752764015209; Thu, 17 Jul 2025 07:53:35 -0700 (PDT) Date: Thu, 17 Jul 2025 07:53:33 -0700 In-Reply-To: <68790db4.a00a0220.3af5df.0020.GAE@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <68790db4.a00a0220.3af5df.0020.GAE@google.com> Message-ID: Subject: Re: [syzbot] [kvm-x86?] WARNING in kvm_arch_vcpu_ioctl_run (6) From: Sean Christopherson To: syzbot Cc: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="us-ascii" On Thu, Jul 17, 2025, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 155a3c003e55 Merge tag 'for-6.16/dm-fixes-2' of git://git... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1413e58c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8d5ef2da1e1c848 > dashboard link: https://syzkaller.appspot.com/bug?extid=cc2032ba16cc2018ca25 > 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=1213e58c580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a567d4580000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-155a3c00.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/725a320dfe66/vmlinux-155a3c00.xz > kernel image: https://storage.googleapis.com/syzbot-assets/9f06899bb6f3/bzImage-155a3c00.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+cc2032ba16cc2018ca25@syzkaller.appspotmail.com > > WARNING: CPU: 1 PID: 6108 at arch/x86/kvm/x86.c:11645 kvm_arch_vcpu_ioctl_run+0x13bc/0x18c0 arch/x86/kvm/x86.c:11645 > Modules linked in: > CPU: 1 UID: 0 PID: 6108 Comm: syz.0.16 Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > RIP: 0010:kvm_arch_vcpu_ioctl_run+0x13bc/0x18c0 arch/x86/kvm/x86.c:11645 > Code: 0a 00 00 00 00 00 00 e8 25 88 be 1e 31 ff 89 c5 89 c6 e8 e7 68 7a 00 85 ed 0f 8f f4 f0 ff ff e9 f5 f1 ff ff e8 95 6d 7a 00 90 <0f> 0b 90 e9 9c f0 ff ff e8 87 6d 7a 00 90 0f 0b 90 e9 d3 f0 ff ff > RSP: 0018:ffffc9000379fc38 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff888044358000 RCX: ffffffff81417587 > RDX: ffff88802327a440 RSI: ffffffff814184eb RDI: 0000000000000007 > RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000001 R12: ffff88804ff02000 > R13: ffff8880443580d8 R14: 0000000000000000 R15: ffff88804ff02120 > FS: 000055555f07c500(0000) GS:ffff8880d6813000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000005200000c CR3: 0000000033cb3000 CR4: 0000000000352ef0 > Call Trace: > > kvm_vcpu_ioctl+0x5eb/0x1690 virt/kvm/kvm_main.c:4464 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:907 [inline] > __se_sys_ioctl fs/ioctl.c:893 [inline] > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f4f8b18e929 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffdc1bf8098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f4f8b3b5fa0 RCX: 00007f4f8b18e929 > RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 > RBP: 00007f4f8b210ca1 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f4f8b3b5fa0 R14: 00007f4f8b3b5fa0 R15: 0000000000000003 > Ha! syzbot finally found an upstream reproducer: https://lore.kernel.org/all/20250715190638.1899116-1-seanjc@google.com