loop7: detected capacity change from 0 to 64
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 1 UID: 0 PID: 7712 Comm: syz.7.225 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:hfs_find_init+0x6a/0x1e0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e8 b5 8a ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 0c 01 00 00 8b 45 00 8d 3c 45 04 00 00
RSP: 0018:ffffc9000431f588 EFLAGS: 00010202
RAX: 1ffff92000863ecf RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000b669000 RSI: 0000000000002bbc RDI: ffffc9000431f670
RBP: 0000000000000040 R08: ffffc9000431f697 R09: 0000000000000000
R10: ffffc9000431f660 R11: fffff52000863ed3 R12: ffff888031976640
R13: dffffc0000000000 R14: ffffc9000431f660 R15: 0000000000000008
FS:  00007fed942ca6c0(0000) GS:ffff888125d85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fed93371d60 CR3: 0000000031614000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_get_block+0x51b/0xbd0 fs/hfs/extent.c:366
 block_read_full_folio+0x29c/0x830 fs/buffer.c:2427
 filemap_read_folio+0x114/0x380 mm/filemap.c:2412
 do_read_cache_folio+0x350/0x590 mm/filemap.c:3894
 do_read_cache_page mm/filemap.c:3960 [inline]
 read_cache_page+0x5d/0x170 mm/filemap.c:3969
 read_mapping_page include/linux/pagemap.h:966 [inline]
 hfs_btree_open+0x55f/0x14f0 fs/hfs/btree.c:78
 hfs_mdb_get+0x1327/0x2080 fs/hfs/mdb.c:199
 hfs_fill_super+0x37b/0x640 fs/hfs/super.c:337
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1679
 vfs_get_tree+0x92/0x2b0 fs/super.c:1802
 do_new_mount+0x24a/0xa40 fs/namespace.c:3885
 do_mount fs/namespace.c:4222 [inline]
 __do_sys_mount fs/namespace.c:4433 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4410
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fed933900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 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:00007fed942c9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fed942c9ef0 RCX: 00007fed933900ca
RDX: 0000200000000100 RSI: 0000200000000900 RDI: 00007fed942c9eb0
RBP: 0000200000000100 R08: 00007fed942c9ef0 R09: 0000000000200050
R10: 0000000000200050 R11: 0000000000000246 R12: 0000200000000900
R13: 00007fed942c9eb0 R14: 00000000000002e9 R15: 0000200000000a80
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfs_find_init+0x6a/0x1e0 fs/hfs/bfind.c:21
Code: 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 e8 b5 8a ff 49 c7 07 00 00 00 00 48 8d 6b 40 49 89 ef 49 c1 ef 03 <43> 0f b6 04 2f 84 c0 0f 85 0c 01 00 00 8b 45 00 8d 3c 45 04 00 00
RSP: 0018:ffffc9000431f588 EFLAGS: 00010202
RAX: 1ffff92000863ecf RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000b669000 RSI: 0000000000002bbc RDI: ffffc9000431f670
RBP: 0000000000000040 R08: ffffc9000431f697 R09: 0000000000000000
R10: ffffc9000431f660 R11: fffff52000863ed3 R12: ffff888031976640
R13: dffffc0000000000 R14: ffffc9000431f660 R15: 0000000000000008
FS:  00007fed942ca6c0(0000) GS:ffff888125d85000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55128e5000 CR3: 0000000031614000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	7e 18                	jle    0x1a
   2:	4c 89 f8             	mov    %r15,%rax
   5:	48 c1 e8 03          	shr    $0x3,%rax
   9:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
   e:	74 08                	je     0x18
  10:	4c 89 ff             	mov    %r15,%rdi
  13:	e8 e8 b5 8a ff       	call   0xff8ab600
  18:	49 c7 07 00 00 00 00 	movq   $0x0,(%r15)
  1f:	48 8d 6b 40          	lea    0x40(%rbx),%rbp
  23:	49 89 ef             	mov    %rbp,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 0f b6 04 2f       	movzbl (%r15,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 0c 01 00 00    	jne    0x143
  37:	8b 45 00             	mov    0x0(%rbp),%eax
  3a:	8d                   	.byte 0x8d
  3b:	3c 45                	cmp    $0x45,%al
  3d:	04 00                	add    $0x0,%al