loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.14.0-rc3-next-20250218-syzkaller #0 Not tainted
--------------------------------------------
syz-executor587/5835 is trying to acquire lock:
ffff888027bf0108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff888034c307c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 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-executor587/5835:
 #0: ffff8880351b00e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
 #1: ffff888026aee998 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_fill_super+0x12ed/0x1be0 fs/hfsplus/super.c:554
 #2: ffff8880351b40b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28
 #3: ffff888034c307c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
 #4: ffff888026aee8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 UID: 0 PID: 5835 Comm: syz-executor587 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3039
 check_deadlock kernel/locking/lockdep.c:3091 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3893
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19c/0x1010 kernel/locking/mutex.c:730
 hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260
 block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396
 filemap_read_folio+0x148/0x3b0 mm/filemap.c:2391
 do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3961
 do_read_cache_page mm/filemap.c:4027 [inline]
 read_cache_page+0x5b/0x170 mm/filemap.c:4036
 read_mapping_page include/linux/pagemap.h:1017 [inline]
 hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0xade/0x1b70 fs/hfsplus/extents.c:469
 hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358
 hfsplus_create_cat+0x1b0/0x1b70 fs/hfsplus/catalog.c:272
 hfsplus_fill_super+0x1354/0x1be0 fs/hfsplus/super.c:561
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2be/0xb40 fs/namespace.c:3659
 do_mount fs/namespace.c:3999 [inline]
 __do_sys_mount fs/namespace.c:4210 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4187
 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: 0033:0x7fdc7ffd2e2a
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:00007ffffd5eb188 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffffd5eb1a0 RCX: 00007fdc7ffd2e2a
RDX: 0000400000000000 RSI: 0000400000000080 RDI: 00007ffffd5eb1a0
RBP: 0000400000000080 R08: 00007ffffd5eb1e0 R09: 00000000000006e4
R10: 000000000180000c R11: 0000000000000286 R12: 0000400000000000
R13: 00007ffffd5eb1e0 R14: 0000000000000003 R15: 000000000180000c
 </TASK>