loop0: detected capacity change from 0 to 1024
hfsplus: trying to free free bnode 0(1)
============================================
WARNING: possible recursive locking detected
6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted
--------------------------------------------
syz-executor252/5058 is trying to acquire lock:
ffff888023db07c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff888023db1c08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x2da/0xb50 fs/hfsplus/extents.c:576

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

6 locks held by syz-executor252/5058:
 #0: ffff888047e7a420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #1: ffff888023db1080 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:828 [inline]
 #1: ffff888023db1080 (&type->i_mutex_dir_key#6/1){+.+.}-{3:3}, at: do_unlinkat+0x26a/0x830 fs/namei.c:4389
 #2: ffff888023db1e00 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #2: ffff888023db1e00 (&sb->s_type->i_mutex_key#14){+.+.}-{3:3}, at: vfs_unlink+0xe4/0x600 fs/namei.c:4327
 #3: ffff888023b7c998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_unlink+0x161/0x790 fs/hfsplus/dir.c:370
 #4: ffff888023db1c08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_truncate+0x2da/0xb50 fs/hfsplus/extents.c:576
 #5: ffff888023b7c8f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_free+0xbb/0x4e0 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 0 PID: 5058 Comm: syz-executor252 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain+0x15c1/0x58e0 kernel/locking/lockdep.c:3856
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260
 block_read_full_folio+0x42e/0xe10 fs/buffer.c:2384
 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2333
 do_read_cache_folio+0x134/0x820 mm/filemap.c:3703
 do_read_cache_page+0x30/0x200 mm/filemap.c:3769
 read_mapping_page include/linux/pagemap.h:888 [inline]
 hfsplus_block_free+0x128/0x4e0 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x17a/0xae0 fs/hfsplus/extents.c:363
 hfsplus_file_truncate+0x7d0/0xb50 fs/hfsplus/extents.c:591
 hfsplus_delete_inode+0x174/0x220
 hfsplus_unlink+0x512/0x790 fs/hfsplus/dir.c:405
 vfs_unlink+0x365/0x600 fs/namei.c:4338
 do_unlinkat+0x4ae/0x830 fs/namei.c:4402
 __do_sys_unlink fs/namei.c:4450 [inline]
 __se_sys_unlink fs/namei.c:4448 [inline]
 __x64_sys_unlink+0x49/0x60 fs/namei.c:4448
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f18752f7af9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff570226a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f187534004b RCX: 00007f18752f7af9
RDX: 00007f18752f6b91 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f1875340053 R08: 0000000000000669 R09: 0000000000000000
R10: 00007fff57022570 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff57022888 R14: 0000000000000001 R15: 0000000000000001
 </TASK>