loop7: detected capacity change from 0 to 164
loop7: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.12.0-syzkaller #0 Not tainted
--------------------------------------------
syz.7.179/7530 is trying to acquire lock:
ffff88805b0d9548 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x383/0x14f0 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff88805b0d87c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, 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.7.179/7530:
 #0: ffff88805b1ce0e0 (&type->s_umount_key#58/1){+.+.}-{3:3}, at: alloc_super+0x221/0x9d0 fs/super.c:344
 #1: ffff888026196998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1380/0x1ca0 fs/hfsplus/super.c:559
 #2: ffff888011ae00b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0 fs/hfsplus/bfind.c:28
 #3: ffff88805b0d87c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:458
 #4: ffff8880261968f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 0 UID: 0 PID: 7530 Comm: syz.7.179 Not tainted 6.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __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+0x418/0xcd0 fs/buffer.c:2401
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2367
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3825
 do_read_cache_page+0x30/0x200 mm/filemap.c:3891
 read_mapping_page include/linux/pagemap.h:1005 [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+0x13ee/0x1ca0 fs/hfsplus/super.c:566
 mount_bdev+0x20a/0x2d0 fs/super.c:1693
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 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: 0033:0x7f570f97feba
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:00007f571074be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f571074bef0 RCX: 00007f570f97feba
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f571074beb0
RBP: 0000000020000000 R08: 00007f571074bef0 R09: 000000000180000c
R10: 000000000180000c R11: 0000000000000246 R12: 0000000020000100
R13: 00007f571074beb0 R14: 00000000000006f0 R15: 0000000020000540
 </TASK>
loop7: detected capacity change from 0 to 32768