loop5: detected capacity change from 0 to 64
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.5.1092/16880 is trying to acquire lock:
ffff8881b0a7e0b0 (&tree->tree_lock#2/1){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300

but task is already holding lock:
ffff8881689b2e78 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_get_block+0x26e/0xc50

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}:
       __mutex_lock+0x19f/0x1300
       hfs_extend_file+0xf2/0x15e0
       hfs_bmap_reserve+0x107/0x430
       __hfs_ext_write_extent+0x1fa/0x470
       __hfs_ext_cache_extent+0x6b/0x9b0
       hfs_extend_file+0x39b/0x15e0
       hfs_get_block+0x412/0xc50
       __block_write_begin_int+0x6c6/0x1910
       cont_write_begin+0x737/0xae0
       hfs_write_begin+0x66/0xb0
       cont_write_begin+0x2e7/0xae0
       hfs_write_begin+0x66/0xb0
       hfs_file_truncate+0x1cf/0xb70
       hfs_inode_setattr+0x4a9/0x670
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       vfs_truncate+0x4b4/0x540
       do_sys_truncate+0xf3/0x1c0
       __x64_sys_truncate+0x5b/0x70
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&tree->tree_lock#2/1){+.+.}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       __mutex_lock+0x19f/0x1300
       hfs_find_init+0x18e/0x300
       hfs_get_block+0x556/0xc50
       block_read_full_folio+0x29f/0x830
       filemap_read_folio+0x137/0x3b0
       do_read_cache_folio+0x358/0x590
       read_cache_page+0x5d/0x170
       __hfs_bnode_create+0x4b9/0x980
       hfs_bnode_find+0x211/0xd40
       hfs_brec_find+0x17b/0x510
       hfs_brec_read+0x24/0x110
       hfs_cat_find_brec+0x177/0x3f0
       hfs_fill_super+0x4ff/0x750
       get_tree_bdev_flags+0x431/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x341/0xd30
       __se_sys_mount+0x31d/0x420
       do_syscall_64+0x14d/0xf80
       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.5.1092/16880:
 #0: ffff8881108180e0 (&type->s_umount_key#108/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0
 #1: ffff8881a3a000b0 (&tree->tree_lock#2){+.+.}-{4:4}, at: hfs_find_init+0x18e/0x300
 #2: ffff8881689b2e78 (&HFS_I(tree->inode)->extents_lock){+.+.}-{4:4}, at: hfs_get_block+0x26e/0xc50

stack backtrace:
CPU: 1 UID: 0 PID: 16880 Comm: syz.5.1092 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+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0xf0/0x2e0
 __mutex_lock+0x19f/0x1300
 hfs_find_init+0x18e/0x300
 hfs_get_block+0x556/0xc50
 block_read_full_folio+0x29f/0x830
 filemap_read_folio+0x137/0x3b0
 do_read_cache_folio+0x358/0x590
 read_cache_page+0x5d/0x170
 __hfs_bnode_create+0x4b9/0x980
 hfs_bnode_find+0x211/0xd40
 hfs_brec_find+0x17b/0x510
 hfs_brec_read+0x24/0x110
 hfs_cat_find_brec+0x177/0x3f0
 hfs_fill_super+0x4ff/0x750
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4a6bf9da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4a6ce8fe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4a6ce8fee0 RCX: 00007f4a6bf9da0a
RDX: 0000200000000380 RSI: 0000200000000000 RDI: 00007f4a6ce8fea0
RBP: 0000200000000380 R08: 00007f4a6ce8fee0 R09: 0000000001218801
R10: 0000000001218801 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f4a6ce8fea0 R14: 0000000000000350 R15: 0000200000002e40
 </TASK>
hfs: get root inode failed
