BUG: kernel NULL pointer dereference, address: 0000000000000048
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8000000106f1d067 P4D 8000000106f1d067 PUD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 UID: 0 PID: 4272 Comm: syz.3.16 Not tainted 6.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:is_anon_ns fs/mount.h:159 [inline]
RIP: 0010:clone_private_mount+0xa2/0x110 fs/namespace.c:2420
Code: c3 40 48 39 dd 75 0b eb 49 48 8b 6d 00 48 39 dd 74 3b 48 8b 7d a8 4c 89 ee e8 ca 26 ff ff 84 c0 74 e7 f6 45 c2 80 74 e1 eb 52 <48> 83 78 48 00 75 4b 4c 89 ff e8 6f 00 00 00 84 c0 74 3f 49 8b 04
RSP: 0018:ffffc900038bfcb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88811771e020 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff83c1bc77 RDI: 00000000ffffffff
RBP: 0000000008000020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881022c5788
R13: ffff88810a084020 R14: ffffffffffffffea R15: ffff88811771e000
FS:  00007fa2ca85c6c0(0000) GS:ffff88813bb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000048 CR3: 000000011036c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ovl_get_layers fs/overlayfs/super.c:1061 [inline]
 ovl_get_lowerstack+0x4be/0x830 fs/overlayfs/super.c:1156
 ovl_fill_super+0x202/0x440 fs/overlayfs/super.c:1404
 vfs_get_super fs/super.c:1280 [inline]
 get_tree_nodev+0x55/0x90 fs/super.c:1299
 vfs_get_tree+0x24/0xb0 fs/super.c:1814
 do_new_mount+0x15a/0x3a0 fs/namespace.c:3651
 do_mount fs/namespace.c:3991 [inline]
 __do_sys_mount fs/namespace.c:4202 [inline]
 __se_sys_mount+0x148/0x1b0 fs/namespace.c:4179
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2c998cde9
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:00007fa2ca85c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa2c9ba5fa0 RCX: 00007fa2c998cde9
RDX: 0000200000000180 RSI: 0000200000000140 RDI: 0000000000000000
RBP: 00007fa2c9a0e2a0 R08: 00002000000001c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa2c9ba5fa0 R15: 00007ffd597f3a88
 </TASK>
Modules linked in:
CR2: 0000000000000048
---[ end trace 0000000000000000 ]---
RIP: 0010:is_anon_ns fs/mount.h:159 [inline]
RIP: 0010:clone_private_mount+0xa2/0x110 fs/namespace.c:2420
Code: c3 40 48 39 dd 75 0b eb 49 48 8b 6d 00 48 39 dd 74 3b 48 8b 7d a8 4c 89 ee e8 ca 26 ff ff 84 c0 74 e7 f6 45 c2 80 74 e1 eb 52 <48> 83 78 48 00 75 4b 4c 89 ff e8 6f 00 00 00 84 c0 74 3f 49 8b 04
RSP: 0018:ffffc900038bfcb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88811771e020 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff83c1bc77 RDI: 00000000ffffffff
RBP: 0000000008000020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881022c5788
R13: ffff88810a084020 R14: ffffffffffffffea R15: ffff88811771e000
FS:  00007fa2ca85c6c0(0000) GS:ffff88813bb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000048 CR3: 000000011036c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	40                   	rex
   2:	48 39 dd             	cmp    %rbx,%rbp
   5:	75 0b                	jne    0x12
   7:	eb 49                	jmp    0x52
   9:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
   d:	48 39 dd             	cmp    %rbx,%rbp
  10:	74 3b                	je     0x4d
  12:	48 8b 7d a8          	mov    -0x58(%rbp),%rdi
  16:	4c 89 ee             	mov    %r13,%rsi
  19:	e8 ca 26 ff ff       	call   0xffff26e8
  1e:	84 c0                	test   %al,%al
  20:	74 e7                	je     0x9
  22:	f6 45 c2 80          	testb  $0x80,-0x3e(%rbp)
  26:	74 e1                	je     0x9
  28:	eb 52                	jmp    0x7c
* 2a:	48 83 78 48 00       	cmpq   $0x0,0x48(%rax) <-- trapping instruction
  2f:	75 4b                	jne    0x7c
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 6f 00 00 00       	call   0xa8
  39:	84 c0                	test   %al,%al
  3b:	74 3f                	je     0x7c
  3d:	49                   	rex.WB
  3e:	8b                   	.byte 0x8b
  3f:	04                   	.byte 0x4