syzbot

loop0: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
6.1.53-syzkaller #0 Not tainted
--------------------------------------------
syz-executor130/3543 is trying to acquire lock:
ffff88807d4a07c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_get_block+0x37f/0x14e0 fs/hfsplus/extents.c:260

but task is already holding lock:
ffff88807c1187c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d2/0x1b10 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

5 locks held by syz-executor130/3543:
 #0: ffff88807bd040e0 (&type->s_umount_key#41/1){+.+.}-{3:3}, at: alloc_super+0x217/0x930 fs/super.c:228
 #1: ffff88807c3f1998 (&sbi->vh_mutex){+.+.}-{3:3}, at: hfsplus_fill_super+0x1378/0x1c90 fs/hfsplus/super.c:553
 #2: ffff88807c1b40b0 (&tree->tree_lock){+.+.}-{3:3}, at: hfsplus_find_init+0x146/0x1c0
 #3: ffff88807c1187c8 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{3:3}, at: hfsplus_file_extend+0x1d2/0x1b10 fs/hfsplus/extents.c:457
 #4: ffff88807c3f18f8 (&sbi->alloc_mutex){+.+.}-{3:3}, at: hfsplus_block_allocate+0x9a/0x8b0 fs/hfsplus/bitmap.c:35

stack backtrace:
CPU: 1 PID: 3543 Comm: syz-executor130 Not tainted 6.1.53-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_deadlock_bug kernel/locking/lockdep.c:2983 [inline]
 check_deadlock kernel/locking/lockdep.c:3026 [inline]
 validate_chain+0x4726/0x58e0 kernel/locking/lockdep.c:3811
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661
 __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 hfsplus_get_block+0x37f/0x14e0 fs/hfsplus/extents.c:260
 block_read_full_folio+0x403/0xf60 fs/buffer.c:2271
 filemap_read_folio+0x199/0x780 mm/filemap.c:2407
 do_read_cache_folio+0x2ee/0x810 mm/filemap.c:3535
 do_read_cache_page+0x32/0x220 mm/filemap.c:3577
 read_mapping_page include/linux/pagemap.h:756 [inline]
 hfsplus_block_allocate+0xea/0x8b0 fs/hfsplus/bitmap.c:37
 hfsplus_file_extend+0xa4c/0x1b10 fs/hfsplus/extents.c:468
 hfsplus_bmap_reserve+0x101/0x4e0 fs/hfsplus/btree.c:358
 hfsplus_create_cat+0x1a9/0x1ba0 fs/hfsplus/catalog.c:272
 hfsplus_fill_super+0x13e6/0x1c90 fs/hfsplus/super.c:560
 mount_bdev+0x2c9/0x3f0 fs/super.c:1432
 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1562
 do_new_mount+0x28b/0xae0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1a220e4c3a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce08c3808 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffce08c3820 RCX: 00007f1a220e4c3a
RDX: 0000000020000000 RSI: 0000000020000080 RDI: 00007ffce08c3820
RBP: 0000000000000004 R08: 00007ffce08c3860 R09: 000000000000064e
R10: 0000000000208010 R11: 0000000000000286 R12: 0000000000208010
R13: 00007ffce08c3860 R14: 0000000000000003 R15: 0000000000080000