loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.15.0-rc2-syzkaller #0 Not tainted
--------------------------------------------
syz-executor269/5838 is trying to acquire lock:
ffff888034841548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x272/0x9d0 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff8880348407c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1ca/0x10f0 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-executor269/5838:
 #0: ffff88807b2ec0e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x235/0xbd0 fs/super.c:344
 #1: ffff88807e02c198 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_fill_super+0x1683/0x1bf0 fs/hfsplus/super.c:554
 #2: ffff88804ba580b0 (&tree->tree_lock){+.+.}-{4:4}, at: hfsplus_find_init+0x17b/0x1f0 fs/hfsplus/bfind.c:28
 #3: ffff8880348407c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1ca/0x10f0 fs/hfsplus/extents.c:458
 #4: ffff88807e02c0f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0xe9/0x990 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 UID: 0 PID: 5838 Comm: syz-executor269 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(full) 
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+0x116/0x1f0 lib/dump_stack.c:120
 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain kernel/locking/lockdep.c:3896 [inline]
 __lock_acquire+0xff7/0x1ba0 kernel/locking/lockdep.c:5235
 lock_acquire kernel/locking/lockdep.c:5866 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
 hfsplus_get_block+0x272/0x9d0 fs/hfsplus/extents.c:260
 block_read_full_folio+0x457/0x850 fs/buffer.c:2392
 filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2400
 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3884
 do_read_cache_page mm/filemap.c:3950 [inline]
 read_cache_page+0x5b/0x160 mm/filemap.c:3959
 read_mapping_page include/linux/pagemap.h:989 [inline]
 hfsplus_block_allocate+0x148/0x990 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0x459/0x10f0 fs/hfsplus/extents.c:469
 hfsplus_bmap_reserve+0x31f/0x420 fs/hfsplus/btree.c:358
 hfsplus_create_cat+0x20d/0x10d0 fs/hfsplus/catalog.c:272
 hfsplus_fill_super+0x16fa/0x1bf0 fs/hfsplus/super.c:561
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1636
 vfs_get_tree+0x8e/0x340 fs/super.c:1759
 do_new_mount fs/namespace.c:3879 [inline]
 path_mount+0x14d4/0x1f30 fs/namespace.c:4206
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount fs/namespace.c:4407 [inline]
 __x64_sys_mount+0x28d/0x310 fs/namespace.c:4407
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09528c2e2a
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:00007ffdf9352328 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffdf9352340 RCX: 00007f09528c2e2a
RDX: 0000200000000000 RSI: 0000200000000100 RDI: 00007ffdf9352340
RBP: 0000200000000100 R08: 00007ffdf9352380 R09: 000000000000066c
R10: 0000000000a08800 R11: 0000000000000286 R12: 0000200000000000
R13: 00007ffdf9352380 R14: 0000000000000003 R15: 0000000000a08800
 </TASK>