BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 8000000066a0f067 P4D 8000000066a0f067 PUD 6575c067 PMD 0 
Oops: Oops: 0010 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 11525 Comm: syz.9.677 Not tainted 6.12.0-rc6-syzkaller-00192-gf1dce1f09380 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900040b7558 EFLAGS: 00010246
RAX: 1ffffffff1831e68 RBX: ffffffff8c18f340 RCX: 0000000000040000
RDX: 0000000000000000 RSI: ffff88805b58d8f8 RDI: ffff88805c4e8018
RBP: ffffc900040b7670 R08: ffffffff82110d93 R09: 1ffffffff348254c
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88805b58d8f8 R14: 1ffff1100b6b1b1f R15: 1ffff92000816eb0
FS:  00007f79812336c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000072532000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1732
 lookup_slow fs/namei.c:1749 [inline]
 lookup_one_unlocked+0x1a4/0x290 fs/namei.c:2912
 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:210 [inline]
 ovl_lookup_single+0x200/0xbd0 fs/overlayfs/namei.c:240
 ovl_lookup_layer+0x417/0x510 fs/overlayfs/namei.c:333
 ovl_lookup+0xcf7/0x2a60 fs/overlayfs/namei.c:1124
 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633
 filename_create+0x297/0x540 fs/namei.c:4027
 do_mkdirat+0xbd/0x3a0 fs/namei.c:4272
 __do_sys_mkdirat fs/namei.c:4295 [inline]
 __se_sys_mkdirat fs/namei.c:4293 [inline]
 __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f798037cfb7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007f7981232e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f7981232ef0 RCX: 00007f798037cfb7
RDX: 00000000000001ff RSI: 0000000020000140 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000020000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000140
R13: 00007f7981232eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900040b7558 EFLAGS: 00010246
RAX: 1ffffffff1831e68 RBX: ffffffff8c18f340 RCX: 0000000000040000
RDX: 0000000000000000 RSI: ffff88805b58d8f8 RDI: ffff88805c4e8018
RBP: ffffc900040b7670 R08: ffffffff82110d93 R09: 1ffffffff348254c
R10: dffffc0000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88805b58d8f8 R14: 1ffff1100b6b1b1f R15: 1ffff92000816eb0
FS:  00007f79812336c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000072532000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400