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: 1 PID: 7818 Comm: syz-executor191 Not tainted 5.1.0-rc6-next-20190426 #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:vcpu_enter_guest+0xbcd/0x5fb0 arch/x86/kvm/x86.c:7895 Code: 48 c1 ea 03 80 3c 02 00 0f 85 6f 48 00 00 49 8b 9f b0 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 39 48 00 00 8b 5b 78 31 ff 89 RSP: 0018:ffff888084cc7a00 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff810d1ec9 RDX: 000000000000000f RSI: ffffffff810ceef2 RDI: 0000000000000078 RBP: ffff888084cc7b10 R08: ffff8880969285c0 R09: ffffed1015d25dd8 R10: ffffed1015d25dd7 R11: ffff8880ae92eebb R12: ffff8880a78a806c R13: 0000000000000001 R14: ffff8880a78a8070 R15: ffff8880a78a8040 FS: 0000555556fdb880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5dd2ff000 CR3: 0000000096cff000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vcpu_run arch/x86/kvm/x86.c:8037 [inline] kvm_arch_vcpu_ioctl_run+0x425/0x1750 arch/x86/kvm/x86.c:8245 kvm_vcpu_ioctl+0x4dc/0xf90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2684 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x670 arch/x86/entry/common.c:298 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4401f9 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:00007fffb7a89e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401a80 R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 32c4638a9b6de5db ]--- RIP: 0010:vcpu_enter_guest+0xbcd/0x5fb0 arch/x86/kvm/x86.c:7895 Code: 48 c1 ea 03 80 3c 02 00 0f 85 6f 48 00 00 49 8b 9f b0 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 78 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 39 48 00 00 8b 5b 78 31 ff 89 RSP: 0018:ffff888084cc7a00 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff810d1ec9 RDX: 000000000000000f RSI: ffffffff810ceef2 RDI: 0000000000000078 RBP: ffff888084cc7b10 R08: ffff8880969285c0 R09: ffffed1015d25dd8 R10: ffffed1015d25dd7 R11: ffff8880ae92eebb R12: ffff8880a78a806c R13: 0000000000000001 R14: ffff8880a78a8070 R15: ffff8880a78a8040 FS: 0000555556fdb880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5dd2ff000 CR3: 0000000096cff000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400