L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6037 Comm: syz-executor909 Not tainted 4.19.0-rc5-next-20180927+ #82 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] RIP: 0010:do_raw_spin_lock+0x27/0x200 kernel/locking/spinlock_debug.c:112 Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 41 55 41 54 53 48 89 fb 48 83 c7 04 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7b RSP: 0018:ffff8801d5387430 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 00000000000001b0 RCX: 0000000000000000 RDX: 0000000000000036 RSI: 0000000000000000 RDI: 00000000000001b4 RBP: ffff8801d5387458 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed0039adc089 R11: 0000000000000000 R12: ffff8801cd6e0430 R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000000 FS: 00000000012fe880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000280 CR3: 00000001d489d000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x35/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] kvm_ioapic_scan_entry+0x7f/0x3c0 arch/x86/kvm/ioapic.c:246 vcpu_scan_ioapic arch/x86/kvm/x86.c:7316 [inline] vcpu_enter_guest+0x49e2/0x6230 arch/x86/kvm/x86.c:7458 vcpu_run arch/x86/kvm/x86.c:7730 [inline] kvm_arch_vcpu_ioctl_run+0x370/0x16e0 arch/x86/kvm/x86.c:7930 kvm_vcpu_ioctl+0x5c8/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2589 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: 0033:0x440099 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc220ff998 EFLAGS: 00000207 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440099 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000207 R12: 0000000000401920 R13: 00000000004019b0 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 02c3362b966e365c ]--- RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] RIP: 0010:do_raw_spin_lock+0x27/0x200 kernel/locking/spinlock_debug.c:112 Code: 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 41 55 41 54 53 48 89 fb 48 83 c7 04 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7b RSP: 0018:ffff8801d5387430 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 00000000000001b0 RCX: 0000000000000000 RDX: 0000000000000036 RSI: 0000000000000000 RDI: 00000000000001b4 RBP: ffff8801d5387458 R08: 0000000000000001 R09: 0000000000000000 R10: ffffed0039adc089 R11: 0000000000000000 R12: ffff8801cd6e0430 R13: 0000000000000000 R14: 0000000000000007 R15: 0000000000000000 FS: 00000000012fe880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000280 CR3: 00000001d489d000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400