loop0: detected capacity change from 0 to 1024
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.2862/15869 is trying to acquire lock:
ffff888111d82b08 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x39e/0x1530

but task is already holding lock:
ffff888121ff58f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x94/0x9b0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->alloc_mutex){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfsplus_block_allocate+0x94/0x9b0
       hfsplus_file_extend+0xae3/0x1990
       hfsplus_bmap_reserve+0x122/0x500
       hfsplus_create_cat+0x183/0x1000
       hfsplus_fill_super+0x12f5/0x1b50
       get_tree_bdev_flags+0x40e/0x4d0
       vfs_get_tree+0x92/0x2b0
       do_new_mount+0x2a2/0x9e0
       __se_sys_mount+0x317/0x410
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       hfsplus_get_block+0x39e/0x1530
       block_read_full_folio+0x29f/0x830
       filemap_read_folio+0x117/0x380
       do_read_cache_folio+0x350/0x590
       read_cache_page+0x5d/0x170
       hfsplus_block_allocate+0xe4/0x9b0
       hfsplus_file_extend+0xae3/0x1990
       hfsplus_get_block+0x411/0x1530
       __block_write_begin_int+0x6b5/0x1900
       cont_write_begin+0x789/0xb50
       hfsplus_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/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->alloc_mutex);
                               lock(&HFSPLUS_I(inode)->extents_lock);
                               lock(&sbi->alloc_mutex);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

4 locks held by syz.0.2862/15869:
 #0: ffff888111784428 (sb_writers#15){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff888020da41f8 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: generic_file_write_iter+0xeb/0x550
 #2: ffff888020da4008 (&hip->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x1fc/0x1990
 #3: ffff888121ff58f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x94/0x9b0

stack backtrace:
CPU: 0 UID: 0 PID: 15869 Comm: syz.0.2862 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
 hfsplus_get_block+0x39e/0x1530
 block_read_full_folio+0x29f/0x830
 filemap_read_folio+0x117/0x380
 do_read_cache_folio+0x350/0x590
 read_cache_page+0x5d/0x170
 hfsplus_block_allocate+0xe4/0x9b0
 hfsplus_file_extend+0xae3/0x1990
 hfsplus_get_block+0x411/0x1530
 __block_write_begin_int+0x6b5/0x1900
 cont_write_begin+0x789/0xb50
 hfsplus_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/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f38ad78ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f38ae5d1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f38ad9d5fa0 RCX: 00007f38ad78ec29
RDX: 0000000000000004 RSI: 0000200000000280 RDI: 0000000000000007
RBP: 00007f38ad811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f38ad9d6038 R14: 00007f38ad9d5fa0 R15: 00007ffdb23a6b88
 </TASK>
