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.
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WARNING: CPU: 0 PID: 3591 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 kvm_mmu_notifier_invalidate_range_start+0xb25/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:714
Modules linked in:
CPU: 0 PID: 3591 Comm: syz-executor545 Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__kvm_handle_hva_range arch/x86/kvm/../../../virt/kvm/kvm_main.c:529 [inline]
RIP: 0010:kvm_mmu_notifier_invalidate_range_start+0xb25/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:714
Code: 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 60 01 00 00 75 4a 31 c0 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 3b a4 7b 00 <0f> 0b eb a0 e8 32 a4 7b 00 0f 0b eb 80 e8 29 a4 7b 00 0f 0b eb 8e
RSP: 0018:ffffc90001a6f7e0 EFLAGS: 00010293
RAX: ffffffff8109f5b5 RBX: 000000002000d000 RCX: ffff88807e361d00
RDX: 0000000000000000 RSI: 000000002000d000 RDI: 000000002000d000
RBP: ffffc90001a6f990 R08: ffffffff8109ec95 R09: ffffc90001a6f8e0
R10: fffff5200034df21 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90002b68000 R14: ffffc90001a6f8e0 R15: 000000002000d000
FS:  00005555567b9300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a51aca51c0 CR3: 0000000019bdc000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mn_hlist_invalidate_range_start mm/mmu_notifier.c:493 [inline]
 __mmu_notifier_invalidate_range_start+0x45f/0x840 mm/mmu_notifier.c:548
 mmu_notifier_invalidate_range_start+0xb6/0xf0 include/linux/mmu_notifier.h:459
 move_page_tables+0x261/0x1900 mm/mremap.c:498
 move_vma+0x5ed/0xfa0 mm/mremap.c:629
 mremap_to mm/mremap.c:862 [inline]
 __do_sys_mremap+0x1207/0x1770 mm/mremap.c:972
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe13df17089
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc94904d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe13df17089
RDX: 0000000000001000 RSI: fffffffffffffe74 RDI: 000000002000d000
RBP: 00007fe13dedb070 R08: 0000000020007000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00007fe13dedb100
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>