syzbot

L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
kvm: vcpu 5: requested lapic timer restore with starting count register 0x390=3829701243 (15318804972 ns) > initial count (13998584072 ns). Using initial count to start timer.
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WARNING: CPU: 0 PID: 4166 at arch/x86/kvm/x86.c:10346 kvm_arch_vcpu_ioctl_run+0x1d63/0x1f80
Modules linked in:
CPU: 0 PID: 4166 Comm: syz-executor229 Not tainted 5.15.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1d63/0x1f80 arch/x86/kvm/x86.c:10346
Code: df e8 e1 a6 ba 00 e9 e5 fa ff ff 89 d9 80 e1 07 38 c1 0f 8c 26 fb ff ff 48 89 df e8 c7 a6 ba 00 e9 19 fb ff ff e8 5d cf 70 00 <0f> 0b e9 e0 fb ff ff 89 d9 80 e1 07 38 c1 0f 8c 63 fb ff ff 48 89
RSP: 0018:ffffc90002f07c60 EFLAGS: 00010293
RAX: ffffffff810fa453 RBX: 0000000000000000 RCX: ffff8880268e9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8116c242 R09: fffffbfff1bd2cd6
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880268e9dc0
R13: ffff888020ca4000 R14: ffff888020ca40f0 R15: ffff88807dde3000
FS:  00005555766bf380(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563010136000 CR3: 000000007dcd8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x7f0/0xcf0 virt/kvm/kvm_main.c:3894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fab9698d369
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdf1bc6228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffdf1bc63f8 RCX: 00007fab9698d369
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fab96a00610 R08: 00007ffdf1bc63f8 R09: 00007ffdf1bc63f8
R10: 00007ffdf1bc63f8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdf1bc63e8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>