EXT4-fs error (device loop4): ext4_orphan_get:1409: comm syz.4.1243: couldn't read orphan inode 15 (err -117)
EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 PID: 9822 Comm: syz.4.1243 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:utf8nlookup+0x39/0xa50 fs/unicode/utf8-norm.c:306
Code: 89 44 24 10 49 89 ce 48 89 14 24 89 f5 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 02 4d f4 fe 49 8d 5d 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 38 88 4c ff 48 8b 1b 48 83 c3 30
RSP: 0018:ffffc9000443f480 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: 0000000000080000
RDX: ffffc9000b9a9000 RSI: 00000000000012a1 RDI: 00000000000012a2
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: ffffc9000443f618 R11: fffff52000887ec6 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88805f310f20 R15: dffffc0000000000
FS:  00007f308b0f76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001b80 CR3: 000000006079b000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 utf8byte+0x34f/0x1370 fs/unicode/utf8-norm.c:-1
 utf8_casefold+0x146/0x260 fs/unicode/utf8-core.c:109
 ext4_fname_setup_ci_filename+0x1d5/0x430 fs/ext4/namei.c:1463
 ext4_fname_prepare_lookup+0x230/0x3d0 fs/ext4/crypto.c:55
 ext4_lookup_entry fs/ext4/namei.c:1767 [inline]
 ext4_lookup+0x125/0x710 fs/ext4/namei.c:1842
 lookup_open fs/namei.c:3474 [inline]
 open_last_lookups fs/namei.c:3564 [inline]
 path_openat+0x10e4/0x3230 fs/namei.c:3794
 do_filp_open+0x1f5/0x430 fs/namei.c:3824
 do_sys_openat2+0x134/0x1d0 fs/open.c:1421
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1447
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f308a19ce59
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:00007f308b0f7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f308a415fa0 RCX: 00007f308a19ce59
RDX: 0000000000000042 RSI: 0000200000001400 RDI: ffffffffffffff9c
RBP: 00007f308a232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f308a416038 R14: 00007f308a415fa0 R15: 00007fffefacd178
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:utf8nlookup+0x39/0xa50 fs/unicode/utf8-norm.c:306
Code: 89 44 24 10 49 89 ce 48 89 14 24 89 f5 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 02 4d f4 fe 49 8d 5d 18 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 38 88 4c ff 48 8b 1b 48 83 c3 30
RSP: 0018:ffffc9000443f480 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: 0000000000080000
RDX: ffffc9000b9a9000 RSI: 00000000000012a1 RDI: 00000000000012a2
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: ffffc9000443f618 R11: fffff52000887ec6 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88805f310f20 R15: dffffc0000000000
FS:  00007f308b0f76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001b80 CR3: 000000006079b000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	89 44 24 10          	mov    %eax,0x10(%rsp)
   4:	49 89 ce             	mov    %rcx,%r14
   7:	48 89 14 24          	mov    %rdx,(%rsp)
   b:	89 f5                	mov    %esi,%ebp
   d:	49 89 fd             	mov    %rdi,%r13
  10:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  17:	fc ff df
  1a:	e8 02 4d f4 fe       	call   0xfef44d21
  1f:	49 8d 5d 18          	lea    0x18(%r13),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 38 88 4c ff       	call   0xff4c8871
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 83 c3 30          	add    $0x30,%rbx