Hello, syzbot found the following issue on: HEAD commit: b401b621758e Linux 6.8-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15cd41c2180000 kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472 dashboard link: https://syzkaller.appspot.com/bug?extid=ee5eb98a07d2c1fb30df compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c32ff3cbe7ed/disk-b401b621.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/17621a870a21/vmlinux-b401b621.xz kernel image: https://storage.googleapis.com/syzbot-assets/b06ad3ca55ee/bzImage-b401b621.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ee5eb98a07d2c1fb30df@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in assign_eip_near arch/x86/kvm/emulate.c:829 [inline] BUG: KMSAN: uninit-value in em_ret+0x124/0x130 arch/x86/kvm/emulate.c:2238 assign_eip_near arch/x86/kvm/emulate.c:829 [inline] em_ret+0x124/0x130 arch/x86/kvm/emulate.c:2238 x86_emulate_insn+0x1d87/0x5880 arch/x86/kvm/emulate.c:5292 x86_emulate_instruction+0x13c9/0x30a0 arch/x86/kvm/x86.c:9171 kvm_emulate_instruction arch/x86/kvm/x86.c:9251 [inline] complete_emulated_io arch/x86/kvm/x86.c:11208 [inline] complete_emulated_mmio+0x70b/0x8b0 arch/x86/kvm/x86.c:11268 kvm_arch_vcpu_ioctl_run+0x1837/0xb890 arch/x86/kvm/x86.c:11380 kvm_vcpu_ioctl+0xbfc/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4441 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0x225/0x410 fs/ioctl.c:857 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable eip created at: em_ret+0x37/0x130 arch/x86/kvm/emulate.c:2234 x86_emulate_insn+0x1d87/0x5880 arch/x86/kvm/emulate.c:5292 CPU: 0 PID: 5793 Comm: syz-executor.0 Not tainted 6.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
