BUG: kernel NULL pointer dereference, address: 0000000000000590
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8000000101f51067 P4D 8000000101f51067 PUD 0 
Oops: Oops: 0000 [#1] SMP PTI
CPU: 1 UID: 0 PID: 2865 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:vc_deallocate+0xeb/0x130 drivers/tty/vt/vt.c:1345
Code: 05 00 00 e8 a7 db b4 ff 48 c7 83 88 05 00 00 00 00 00 00 48 8b bb 00 04 00 00 e8 e0 63 b6 ff 49 c7 06 00 00 00 00 eb 02 31 db <48> 8b bb 90 05 00 00 48 85 ff 74 10 e8 c4 63 b6 ff 48 c7 83 90 05
RSP: 0018:ffffc90000f7fbc8 EFLAGS: 00010246
RAX: 0000000000000050 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 088da4b477fc6b35 RSI: ffffffff8252ca5f RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000000 R11: ffffffff8198a570 R12: 0000000000005608
R13: ffff8881023c0800 R14: ffffffff871b6ef0 R15: 0000000000000000
FS:  00007f36e26ef6c0(0000) GS:ffff8882b4b2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000590 CR3: 0000000102f32000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 vt_disallocate_all+0xb0/0x100 drivers/tty/vt/vt_ioctl.c:652
 vt_ioctl+0xea7/0xec0 drivers/tty/vt/vt_ioctl.c:886
 tty_ioctl+0x5d0/0x690 drivers/tty/tty_io.c:2792
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0x69/0xc0 fs/ioctl.c:584
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f36e287ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f36e26ef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f36e2ab5fa0 RCX: 00007f36e287ebe9
RDX: 0000000000000000 RSI: 0000000000005608 RDI: 0000000000000004
RBP: 00007f36e2901e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36e2ab6038 R14: 00007f36e2ab5fa0 R15: 00007fff98e4e008
 </TASK>
Modules linked in:
CR2: 0000000000000590
---[ end trace 0000000000000000 ]---
RIP: 0010:vc_deallocate+0xeb/0x130 drivers/tty/vt/vt.c:1345
Code: 05 00 00 e8 a7 db b4 ff 48 c7 83 88 05 00 00 00 00 00 00 48 8b bb 00 04 00 00 e8 e0 63 b6 ff 49 c7 06 00 00 00 00 eb 02 31 db <48> 8b bb 90 05 00 00 48 85 ff 74 10 e8 c4 63 b6 ff 48 c7 83 90 05
RSP: 0018:ffffc90000f7fbc8 EFLAGS: 00010246
RAX: 0000000000000050 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 088da4b477fc6b35 RSI: ffffffff8252ca5f RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000000 R11: ffffffff8198a570 R12: 0000000000005608
R13: ffff8881023c0800 R14: ffffffff871b6ef0 R15: 0000000000000000
FS:  00007f36e26ef6c0(0000) GS:ffff8882b4b2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000590 CR3: 0000000102f32000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	05 00 00 e8 a7       	add    $0xa7e80000,%eax
   5:	db b4 ff 48 c7 83 88 	(bad)  -0x777c38b8(%rdi,%rdi,8)
   c:	05 00 00 00 00       	add    $0x0,%eax
  11:	00 00                	add    %al,(%rax)
  13:	48 8b bb 00 04 00 00 	mov    0x400(%rbx),%rdi
  1a:	e8 e0 63 b6 ff       	call   0xffb663ff
  1f:	49 c7 06 00 00 00 00 	movq   $0x0,(%r14)
  26:	eb 02                	jmp    0x2a
  28:	31 db                	xor    %ebx,%ebx
* 2a:	48 8b bb 90 05 00 00 	mov    0x590(%rbx),%rdi <-- trapping instruction
  31:	48 85 ff             	test   %rdi,%rdi
  34:	74 10                	je     0x46
  36:	e8 c4 63 b6 ff       	call   0xffb663ff
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7
  3d:	83                   	.byte 0x83
  3e:	90                   	nop
  3f:	05                   	.byte 0x5