From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: Re: WARNING in kvm_arch_vcpu_ioctl_run (3) Date: Tue, 02 Oct 2018 14:07:03 -0700 Message-ID: <000000000000acf9cc0577454de3@google.com> References: <000000000000d05a78056873bc47@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes To: bp@alien8.de, hpa@zytor.com, kernellwp@gmail.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Return-path: In-Reply-To: <000000000000d05a78056873bc47@google.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: 1d2ba7fee28b Merge tag 'fbdev-v4.19-rc7' of https://github.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b019b9400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb dashboard link: https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=156ad231400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com kvm: emulating exchange as write WARNING: CPU: 1 PID: 10797 at arch/x86/kvm/x86.c:7925 kvm_arch_vcpu_ioctl_run+0x1ca/0x16e0 arch/x86/kvm/x86.c:7925 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 10797 Comm: syz-executor4 Not tainted 4.19.0-rc6+ #264 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1ca/0x16e0 arch/x86/kvm/x86.c:7925 Code: 03 80 3c 02 00 0f 85 f0 13 00 00 4c 8b a3 18 2c 00 00 31 ff 4c 89 e6 e8 74 96 6e 00 4d 85 e4 0f 84 fd 0a 00 00 e8 36 95 6e 00 <0f> 0b e8 2f 95 6e 00 49 8d 7d 01 48 b8 00 00 00 00 00 fc ff df 48 RSP: 0018:ffff8801d7fff860 EFLAGS: 00010293 RAX: ffff8801c92de280 RBX: ffff8801c8fe0540 RCX: ffffffff81102b80 RDX: 0000000000000000 RSI: ffffffff8110204a RDI: 0000000000000005 RBP: ffff8801d7fff8d8 R08: ffff8801c92de280 R09: 1ffffffff1273955 R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000001 R13: ffff8801c29a7000 R14: 0000000000000000 R15: ffff8801c8fe0618 kvm_vcpu_ioctl+0x72b/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f51c3ee0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f51c3ee16d4 R13: 00000000004c003b R14: 00000000004d0108 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..