Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 488 Comm: syz.2.17 Not tainted syzkaller #0 c2f3633dcc92420553f0990c9521af1153fc2801
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:213 [inline]
RIP: 0010:ovl_lookup_single+0x209/0xb90 fs/overlayfs/namei.c:240
Code: 6d c7 a5 ff 48 89 c3 48 3d 01 f0 ff ff 72 0a e8 7d 15 40 ff e9 9a 04 00 00 49 89 dc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 58 07 00 00 44 8b 33 44 89 f6 81 e6 00
RSP: 0018:ffffc9000119f900 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000016 RCX: efa4c0d89aae8900
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888128a30098
RBP: ffffc9000119f9f0 R08: ffff888128a3009f R09: 1ffff11025146013
R10: dffffc0000000000 R11: ffffed1025146014 R12: 0000000000000002
R13: 1ffff92000233f2c R14: ffff88811cd163b8 R15: ffff888112bff258
FS:  00007fef4eab26c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef4ea6fff8 CR3: 000000011cc10000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ovl_lookup_layer+0x355/0x420 fs/overlayfs/namei.c:333
 ovl_lookup+0x8d2/0x1d60 fs/overlayfs/namei.c:1124
 lookup_one_qstr_excl+0x12c/0x280 fs/namei.c:1641
 filename_create+0x239/0x480 fs/namei.c:4035
 do_mkdirat+0xa9/0x530 fs/namei.c:4280
 __do_sys_mkdirat fs/namei.c:4303 [inline]
 __se_sys_mkdirat fs/namei.c:4301 [inline]
 __x64_sys_mkdirat+0x8b/0xa0 fs/namei.c:4301
 x64_sys_call+0x2ba8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fef4db9acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fef4eab2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fef4de15fa0 RCX: 00007fef4db9acb9
RDX: 0000000000000000 RSI: 0000200000002000 RDI: ffffffffffffff9c
RBP: 00007fef4dc08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fef4de16038 R14: 00007fef4de15fa0 R15: 00007ffed029b2c8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ovl_lookup_positive_unlocked fs/overlayfs/namei.c:213 [inline]
RIP: 0010:ovl_lookup_single+0x209/0xb90 fs/overlayfs/namei.c:240
Code: 6d c7 a5 ff 48 89 c3 48 3d 01 f0 ff ff 72 0a e8 7d 15 40 ff e9 9a 04 00 00 49 89 dc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 58 07 00 00 44 8b 33 44 89 f6 81 e6 00
RSP: 0018:ffffc9000119f900 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: 0000000000000016 RCX: efa4c0d89aae8900
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888128a30098
RBP: ffffc9000119f9f0 R08: ffff888128a3009f R09: 1ffff11025146013
R10: dffffc0000000000 R11: ffffed1025146014 R12: 0000000000000002
R13: 1ffff92000233f2c R14: ffff88811cd163b8 R15: ffff888112bff258
FS:  00007fef4eab26c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef4ea70d58 CR3: 000000011cc10000 CR4: 00000000003526b0
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	a5                   	movsl  %ds:(%rsi),%es:(%rdi)
   1:	ff 48 89             	decl   -0x77(%rax)
   4:	c3                   	ret
   5:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   b:	72 0a                	jb     0x17
   d:	e8 7d 15 40 ff       	call   0xff40158f
  12:	e9 9a 04 00 00       	jmp    0x4b1
  17:	49 89 dc             	mov    %rbx,%r12
  1a:	49 c1 ec 03          	shr    $0x3,%r12
  1e:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  25:	fc ff df
* 28:	41 0f b6 04 04       	movzbl (%r12,%rax,1),%eax <-- trapping instruction
  2d:	84 c0                	test   %al,%al
  2f:	0f 85 58 07 00 00    	jne    0x78d
  35:	44 8b 33             	mov    (%rbx),%r14d
  38:	44 89 f6             	mov    %r14d,%esi
  3b:	81                   	.byte 0x81
  3c:	e6 00                	out    %al,$0x0