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.
list_del corruption. prev->next should be ffff8880aa04e170, but was ffff88821b8529b0
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:51!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9090 Comm: syz-executor.4 Not tainted 5.5.0-rc1-next-20191211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid.cold+0xf/0x4f lib/list_debug.c:51
Code: e8 c9 00 cb fd 0f 0b 48 89 f1 48 c7 c7 c0 10 70 88 4c 89 e6 e8 b5 00 cb fd 0f 0b 4c 89 f6 48 c7 c7 60 12 70 88 e8 a4 00 cb fd <0f> 0b 4c 89 ea 4c 89 f6 48 c7 c7 a0 11 70 88 e8 90 00 cb fd 0f 0b
RSP: 0018:ffffc90002c4f858 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8880aa10a000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff52000589efd
RBP: ffffc90002c4f870 R08: 0000000000000054 R09: ffffed1015d26621
R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880aa10a100
R13: ffff88821b8529b0 R14: ffff8880aa04e170 R15: ffff8880aa04e170
FS:  00007fea7971f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc44993f000 CR3: 000000006702f000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:131 [inline]
 dentry_unlist fs/dcache.c:522 [inline]
 __dentry_kill+0x1fd/0x600 fs/dcache.c:575
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x62f/0xe10 fs/dcache.c:859
 simple_recursive_removal+0x5bc/0x6d0 fs/libfs.c:302
 debugfs_remove fs/debugfs/inode.c:713 [inline]
 debugfs_remove+0x5e/0x80 fs/debugfs/inode.c:707
 kvm_destroy_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:620 [inline]
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:795 [inline]
 kvm_put_kvm+0x136/0xcc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:837
 kvm_vm_release+0x44/0x60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:860
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x8e7/0x2ef0 kernel/exit.c:797
 do_group_exit+0x135/0x360 kernel/exit.c:895
 get_signal+0x47c/0x24f0 kernel/signal.c:2734
 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a909
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fea7971ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c8
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 000000000045a909
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fea7971f6d4
R13: 00000000004cb421 R14: 00000000004e4b58 R15: 00000000ffffffff
Modules linked in:
---[ end trace 116df7f83524080f ]---
RIP: 0010:__list_del_entry_valid.cold+0xf/0x4f lib/list_debug.c:51
Code: e8 c9 00 cb fd 0f 0b 48 89 f1 48 c7 c7 c0 10 70 88 4c 89 e6 e8 b5 00 cb fd 0f 0b 4c 89 f6 48 c7 c7 60 12 70 88 e8 a4 00 cb fd <0f> 0b 4c 89 ea 4c 89 f6 48 c7 c7 a0 11 70 88 e8 90 00 cb fd 0f 0b
RSP: 0018:ffffc90002c4f858 EFLAGS: 00010282
RAX: 0000000000000054 RBX: ffff8880aa10a000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815e8576 RDI: fffff52000589efd
RBP: ffffc90002c4f870 R08: 0000000000000054 R09: ffffed1015d26621
R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff8880aa10a100
R13: ffff88821b8529b0 R14: ffff8880aa04e170 R15: ffff8880aa04e170
FS:  00007fea7971f700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc44993f000 CR3: 000000006702f000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400