======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.3506/22481 is trying to acquire lock:
ffff888171e480b0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x2c0

but task is already holding lock:
ffff8881aa2f2178 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_get_block+0x268/0xbd0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfs_extend_file+0xda/0x14c0
       hfs_bmap_reserve+0x107/0x430
       __hfs_ext_write_extent+0x1fa/0x470
       __hfs_ext_cache_extent+0x6b/0x9b0
       hfs_extend_file+0x31e/0x14c0
       hfs_get_block+0x3d7/0xbd0
       __block_write_begin_int+0x6b5/0x1900
       cont_write_begin+0x789/0xb50
       hfs_write_begin+0x66/0xb0
       generic_perform_write+0x2c5/0x900
       generic_file_write_iter+0x117/0x550
       vfs_write+0x5c9/0xb30
       ksys_write+0x145/0x250
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&tree->tree_lock#2/1){+.+.}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfs_find_init+0x18e/0x2c0
       hfs_get_block+0x51b/0xbd0
       block_read_full_folio+0x29f/0x830
       filemap_read_folio+0x117/0x380
       do_read_cache_folio+0x350/0x590
       read_cache_page+0x5d/0x170
       __hfs_bnode_create+0x521/0xb20
       hfs_bnode_find+0x24c/0xf50
       hfs_brec_find+0x172/0x510
       hfs_brec_read+0x24/0x110
       hfs_cat_find_brec+0x15c/0x3f0
       hfs_fill_super+0x4ae/0x6a0
       get_tree_bdev_flags+0x40e/0x4d0
       vfs_get_tree+0x92/0x2b0
       do_new_mount+0x302/0xa10
       __se_sys_mount+0x313/0x410
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&HFS_I(tree->inode)->extents_lock);
                               lock(&tree->tree_lock#2/1);
                               lock(&HFS_I(tree->inode)->extents_lock);
  lock(&tree->tree_lock#2/1);

 *** DEADLOCK ***

3 locks held by syz.3.3506/22481:
 #0: ffff8881158440e0 (&type->s_umount_key#78/1){+.+.}-{4:4}, at: alloc_super+0x1bb/0x930
 #1: ffff888171e4a0b0 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x2c0
 #2: ffff8881aa2f2178 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_get_block+0x268/0xbd0

stack backtrace:
CPU: 1 UID: 0 PID: 22481 Comm: syz.3.3506 Not tainted syzkaller #0 PREEMPT(full) 
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_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 __mutex_lock+0x187/0x1350
 hfs_find_init+0x18e/0x2c0
 hfs_get_block+0x51b/0xbd0
 block_read_full_folio+0x29f/0x830
 filemap_read_folio+0x117/0x380
 do_read_cache_folio+0x350/0x590
 read_cache_page+0x5d/0x170
 __hfs_bnode_create+0x521/0xb20
 hfs_bnode_find+0x24c/0xf50
 hfs_brec_find+0x172/0x510
 hfs_brec_read+0x24/0x110
 hfs_cat_find_brec+0x15c/0x3f0
 hfs_fill_super+0x4ae/0x6a0
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x302/0xa10
 __se_sys_mount+0x313/0x410
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc76319076a
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:00007fc763f5fe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc763f5fef0 RCX: 00007fc76319076a
RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007fc763f5feb0
RBP: 0000200000000180 R08: 00007fc763f5fef0 R09: 0000000001000012
R10: 0000000001000012 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fc763f5feb0 R14: 0000000000000319 R15: 0000200000000040
 </TASK>
hfs: get root inode failed
