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.
BUG: kernel NULL pointer dereference, address: 0000000000000086
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 1e9f99067 P4D 1e9f99067 PUD 1e9f98067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 359 Comm: syz-executor671 Not tainted 5.4.89-syzkaller-00259-g9b928c0480bd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881e8baf828 EFLAGS: 00010086
RAX: ffff8881e8baf858 RBX: fffffe0000000000 RCX: ffff8881de01be00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff8229f500 R09: ffffffff811d164b
R10: ffff8881de01be00 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff846013f0 R15: fffffe0000000ecb
FS:  00000000020e9880(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001e9f9a000 CR4: 00000000001426f0
Call Trace:
Modules linked in:
CR2: 0000000000000086
---[ end trace cd13bc8f0b5a59a7 ]---
RIP: 0010:0x86
Code: Bad RIP value.
RSP: 0018:ffff8881e8baf828 EFLAGS: 00010086
RAX: ffff8881e8baf858 RBX: fffffe0000000000 RCX: ffff8881de01be00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000ec0 R08: ffffffff8229f500 R09: ffffffff811d164b
R10: ffff8881de01be00 R11: 0000000000000002 R12: dffffc0000000000
R13: fffffe0000000ec8 R14: ffffffff846013f0 R15: fffffe0000000ecb
FS:  00000000020e9880(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000005c CR3: 00000001e9f9a000 CR4: 00000000001426f0