loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
5.15.182-syzkaller #0 Not tainted
--------------------------------------------
syz-executor403/4164 is trying to acquire lock:
ffff888075b11548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x39b/0x1530 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff888075b107c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1b3/0x1950 fs/hfsplus/extents.c:458

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&HFSPLUS_I(inode)->extents_lock);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz-executor403/4164:
 #0: ffff888076ee40e0 (&type->s_umount_key#42/1){+.+.}-{3:3}, at: alloc_super+0x201/0x950 fs/super.c:229
 #1: ffff88807986b998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1286/0x1b90 fs/hfsplus/super.c:553
 #2: ffff888075b000b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x150/0x1c0 fs/hfsplus/bfind.c:28
 #3: ffff888075b107c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1b3/0x1950 fs/hfsplus/extents.c:458
 #4: ffff88807986b8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x91/0x900 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 PID: 4164 Comm: syz-executor403 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __lock_acquire+0x1227/0x7c60 kernel/locking/lockdep.c:-1
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x1eb/0x2390 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 hfsplus_get_block+0x39b/0x1530 fs/hfsplus/extents.c:260
 block_read_full_page+0x2e8/0xd10 fs/buffer.c:2290
 do_read_cache_page+0x8a1/0x1030 mm/filemap.c:-1
 read_mapping_page include/linux/pagemap.h:515 [inline]
 hfsplus_block_allocate+0xf4/0x900 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0xa8e/0x1950 fs/hfsplus/extents.c:469
 hfsplus_bmap_reserve+0x11e/0x4f0 fs/hfsplus/btree.c:357
 hfsplus_create_cat+0x180/0x1020 fs/hfsplus/catalog.c:272
 hfsplus_fill_super+0x12f6/0x1b90 fs/hfsplus/super.c:560
 mount_bdev+0x287/0x3c0 fs/super.c:1400
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3013
 do_mount fs/namespace.c:3356 [inline]
 __do_sys_mount fs/namespace.c:3564 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3541
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f9bb6d3493a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe2e073508 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe2e073520 RCX: 00007f9bb6d3493a
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007ffe2e073520
RBP: 0000200000000040 R08: 00007ffe2e073560 R09: 000000000000061e
R10: 0000000000200008 R11: 0000000000000286 R12: 0000200000000000
R13: 00007ffe2e073560 R14: 0000000000000003 R15: 0000000000200008
 </TASK>