loop0: detected capacity change from 0 to 1024
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc2-next-20240607-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/8784 is trying to acquire lock:
ffff8880491f0e88 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:457

but task is already holding lock:
ffff88806060e0b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&tree->tree_lock#2){+.+.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       hfsplus_file_truncate+0x811/0xb50 fs/hfsplus/extents.c:595
       hfsplus_write_begin+0xca/0xd0 fs/hfsplus/inode.c:51
       cont_expand_zero fs/buffer.c:2512 [inline]
       cont_write_begin+0x319/0x890 fs/buffer.c:2575
       hfsplus_write_begin+0x8a/0xd0 fs/hfsplus/inode.c:47
       generic_cont_expand_simple+0x18f/0x2b0 fs/buffer.c:2476
       hfsplus_setattr+0x16d/0x270 fs/hfsplus/inode.c:259
       notify_change+0xb9d/0xe70 fs/attr.c:497
       do_truncate fs/open.c:65 [inline]
       do_ftruncate+0x46b/0x590 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+0x95/0xf0 fs/open.c:205
       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

-> #0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3159 [inline]
       check_prevs_add kernel/locking/lockdep.c:3278 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902
       __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5194
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5817
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       hfsplus_file_extend+0x21b/0x1b70 fs/hfsplus/extents.c:457
       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:1659
       legacy_get_tree+0xee/0x190 fs/fs_context.c:662
       vfs_get_tree+0x90/0x2a0 fs/super.c:1780
       do_new_mount+0x2be/0xb40 fs/namespace.c:3352
       do_mount fs/namespace.c:3692 [inline]
       __do_sys_mount fs/namespace.c:3898 [inline]
       __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3875
       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

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&tree->tree_lock#2);
                               lock(&HFSPLUS_I(inode)->extents_lock);
                               lock(&tree->tree_lock#2);
  lock(&HFSPLUS_I(inode)->extents_lock);

 *** DEADLOCK ***

3 locks held by syz-executor.0/8784:
 #0: ffff88801fbac0e0 (&type->s_umount_key#106/1){+.+.}-{3:3}, at: alloc_super+0x221/0x9d0 fs/super.c:344
 #1: ffff88807a239198 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1380/0x1ca0 fs/hfsplus/super.c:559
 #2: ffff88806060e0b0 (&tree->tree_lock#2){+.+.}-{3:3}, at: hfsplus_find_init+0x14a/0x1c0

stack backtrace:
CPU: 0 PID: 8784 Comm: syz-executor.0 Not tainted 6.10.0-rc2-next-20240607-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:91 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2075
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2204
 check_prev_add kernel/locking/lockdep.c:3159 [inline]
 check_prevs_add kernel/locking/lockdep.c:3278 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3902