loop7: detected capacity change from 0 to 1024
============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.7.1541/13942 is trying to acquire lock:
ffff88803a3a0740 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:264

but task is already holding lock:
ffff8880546513c0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2d0/0xd20 fs/hfsplus/extents.c:579

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

locks held by syz.7.1541/13942: 6, last CPU#1:
 #0: ffff8880473ee460 (sb_writers#42){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
 #1: ffff88803a3a0298 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
 #1: ffff88803a3a0298 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
 #1: ffff88803a3a0298 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
 #1: ffff88803a3a0298 (&type->i_mutex_dir_key#24/1){+.+.}-{4:4}, at: filename_unlinkat+0x2a7/0x610 fs/namei.c:5700
 #2: ffff888054651558 (&sb->s_type->i_mutex_key#58){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #2: ffff888054651558 (&sb->s_type->i_mutex_key#58){+.+.}-{4:4}, at: vfs_unlink+0xd5/0x6d0 fs/namei.c:5635
 #3: ffff8880524de188 (&sbi->vh_mutex){+.+.}-{4:4}, at: hfsplus_unlink+0x18b/0x8e0 fs/hfsplus/dir.c:385
 #4: ffff8880546513c0 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_truncate+0x2d0/0xd20 fs/hfsplus/extents.c:579
 #5: ffff8880524de0f0 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_free+0xc7/0x630 fs/hfsplus/bitmap.c:182

stack backtrace:
CPU: 1 UID: 0 PID: 13942 Comm: syz.7.1541 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x27a/0x290 kernel/locking/lockdep.c:3057
 check_deadlock kernel/locking/lockdep.c:3109 [inline]
 validate_chain kernel/locking/lockdep.c:3911 [inline]
 __lock_acquire+0x261c/0x2e50 kernel/locking/lockdep.c:5254
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908
 __mutex_lock_common kernel/locking/mutex.c:646 [inline]
 __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821
 hfsplus_get_block+0x391/0x1610 fs/hfsplus/extents.c:264
 block_read_full_folio+0x29f/0x810 fs/buffer.c:2308
 filemap_read_folio+0x12c/0x3a0 mm/filemap.c:2520
 do_read_cache_folio+0x354/0x590 mm/filemap.c:4156
 do_read_cache_page mm/filemap.c:4222 [inline]
 read_cache_page+0x5d/0x170 mm/filemap.c:4231
 read_mapping_page include/linux/pagemap.h:1009 [inline]
 hfsplus_block_free+0x134/0x630 fs/hfsplus/bitmap.c:185
 hfsplus_free_extents+0x121/0xa50 fs/hfsplus/extents.c:364
 hfsplus_file_truncate+0x7ef/0xd20 fs/hfsplus/extents.c:595
 hfsplus_delete_inode+0x180/0x230 fs/hfsplus/inode.c:-1
 hfsplus_unlink+0x4e4/0x8e0 fs/hfsplus/dir.c:420
 vfs_unlink+0x27b/0x6d0 fs/namei.c:5649
 filename_unlinkat+0x3cd/0x610 fs/namei.c:5719
 __do_sys_unlinkat fs/namei.c:5748 [inline]
 __se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5740
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14e8d9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f14e9ba0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f14e9025fa0 RCX: 00007f14e8d9e159
RDX: 0000000000000000 RSI: 0000200000000380 RDI: ffffffffffffff9c
RBP: 00007f14e8e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14e9026038 R14: 00007f14e9025fa0 R15: 00007ffc160d96c8
 </TASK>
hfsplus: unable to mark blocks free: error -5
hfsplus: can't free extent: start 134, count 1