============================================
WARNING: possible recursive locking detected
6.9.0-rc1-syzkaller-00009-g7033999ecd7b #0 Not tainted
--------------------------------------------
syz-executor243/5185 is trying to acquire lock:
ffff88802b5e8108 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457

but task is already holding lock:
ffff88802b5ea988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457

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

4 locks held by syz-executor243/5185:
 #0: ffff88801b38a420 (sb_writers#10){.+.+}-{0:0}, at: do_sys_ftruncate fs/open.c:199 [inline]
 #0: ffff88801b38a420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_ftruncate fs/open.c:207 [inline]
 #0: ffff88801b38a420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_ftruncate fs/open.c:205 [inline]
 #0: ffff88801b38a420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_ftruncate+0xa9/0x110 fs/open.c:205
 #1: ffff88802b5eab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #1: ffff88802b5eab80 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: do_truncate+0x14b/0x220 fs/open.c:63
 #2: ffff88802b5ea988 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457
 #3: ffff88801b38c0b0 (&tree->tree_lock/1){+.+.}-{3:3}, at: hfsplus_find_init+0x16e/0x200 fs/hfsplus/bfind.c:33

stack backtrace:
CPU: 2 PID: 5185 Comm: syz-executor243 Not tainted 6.9.0-rc1-syzkaller-00009-g7033999ecd7b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_deadlock kernel/locking/lockdep.c:3062 [inline]
 validate_chain kernel/locking/lockdep.c:3856 [inline]
 __lock_acquire+0x20e6/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
 hfsplus_file_extend+0x1c1/0x1090 fs/hfsplus/extents.c:457
 hfsplus_bmap_reserve+0x31c/0x410 fs/hfsplus/btree.c:358
 __hfsplus_ext_write_extent+0x474/0x5e0 fs/hfsplus/extents.c:104
 __hfsplus_ext_cache_extent+0x98/0x9d0 fs/hfsplus/extents.c:186
 hfsplus_ext_read_extent+0x200/0x250 fs/hfsplus/extents.c:218
 hfsplus_file_extend+0x699/0x1090 fs/hfsplus/extents.c:461
 hfsplus_get_block+0x1ae/0x9e0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x4fb/0x16e0 fs/buffer.c:2105
 __block_write_begin fs/buffer.c:2154 [inline]
 block_write_begin+0xb1/0x4a0 fs/buffer.c:2213
 cont_write_begin+0x53d/0x740 fs/buffer.c:2567
 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:47
 cont_expand_zero fs/buffer.c:2494 [inline]
 cont_write_begin+0x333/0x740 fs/buffer.c:2557
 hfsplus_write_begin+0x87/0x150 fs/hfsplus/inode.c:47
 generic_cont_expand_simple+0x121/0x210 fs/buffer.c:2458
 hfsplus_setattr+0x193/0x310 fs/hfsplus/inode.c:259
 notify_change+0x742/0x11c0 fs/attr.c:497
 do_truncate+0x15c/0x220 fs/open.c:65
 do_ftruncate+0x5e5/0x720 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0xa9/0x110 fs/open.c:205
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f53e5b7e639
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:00007ffde9d686e8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007ffde9d688b8 RCX: 00007f53e5b7e639
RDX: 00007f53e5bb99f3 RSI: 0000000002007ffb RDI: 0000000000000004
RBP: 00007f53e5bf1610 R08: 0000000000000000 R09: 00007ffde9d688b8
R10: 0000000000000603 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffde9d688a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>