loop0: detected capacity change from 0 to 4096
ntfs3: Unknown parameter '01777777777777777777777'
loop0: detected capacity change from 0 to 1024
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.0/5329 is trying to acquire lock:
ffff888012b9a8f8 (&sbi->alloc_mutex){+.+.}-{4:4}, at: hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35

but task is already holding lock:
ffff888052c47708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21d/0x1b70 fs/hfsplus/extents.c:458

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}:
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
       hfsplus_get_block+0x385/0x14f0 fs/hfsplus/extents.c:260
       block_read_full_folio+0x2d3/0x850 fs/buffer.c:2392
       filemap_read_folio+0x14a/0x3b0 mm/filemap.c:2400
       do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3884
       do_read_cache_page mm/filemap.c:3950 [inline]
       read_cache_page+0x5b/0x170 mm/filemap.c:3959
       read_mapping_page include/linux/pagemap.h:989 [inline]
       hfsplus_block_allocate+0xee/0x8c0 fs/hfsplus/bitmap.c:37
       hfsplus_file_extend+0xae0/0x1b70 fs/hfsplus/extents.c:469
       hfsplus_get_block+0x408/0x14f0 fs/hfsplus/extents.c:245
       __block_write_begin_int+0x691/0x1930 fs/buffer.c:2116
       block_write_begin fs/buffer.c:2227 [inline]
       cont_write_begin+0x781/0xb40 fs/buffer.c:2566
       hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
       generic_perform_write+0x329/0xa10 mm/filemap.c:4102
       generic_file_write_iter+0x10e/0x5e0 mm/filemap.c:4245
       new_sync_write fs/read_write.c:591 [inline]
       vfs_write+0x70f/0xd10 fs/read_write.c:684
       ksys_write+0x19d/0x2d0 fs/read_write.c:736
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&sbi->alloc_mutex){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
       __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
       lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
       hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35
       hfsplus_file_extend+0xae0/0x1b70 fs/hfsplus/extents.c:469
       hfsplus_get_block+0x408/0x14f0 fs/hfsplus/extents.c:245
       __block_write_begin_int+0x691/0x1930 fs/buffer.c:2116
       block_write_begin fs/buffer.c:2227 [inline]
       cont_write_begin+0x781/0xb40 fs/buffer.c:2566
       hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
       generic_perform_write+0x329/0xa10 mm/filemap.c:4102
       generic_file_write_iter+0x10e/0x5e0 mm/filemap.c:4245
       new_sync_write fs/read_write.c:591 [inline]
       vfs_write+0x70f/0xd10 fs/read_write.c:684
       ksys_write+0x19d/0x2d0 fs/read_write.c:736
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

4 locks held by syz.0.0/5329:
 #0: ffff888033cc62b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x310 fs/file.c:1213
 #1: ffff888052df2420 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
 #1: ffff888052df2420 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x23f/0xd10 fs/read_write.c:680
 #2: ffff888052c478f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #2: ffff888052c478f8 (&sb->s_type->i_mutex_key#20){+.+.}-{4:4}, at: generic_file_write_iter+0xe2/0x5e0 mm/filemap.c:4242
 #3: ffff888052c47708 (&HFSPLUS_I(inode)->extents_lock){+.+.}-{4:4}, at: hfsplus_file_extend+0x21d/0x1b70 fs/hfsplus/extents.c:458

stack backtrace:
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079
 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
 hfsplus_block_allocate+0x9e/0x8c0 fs/hfsplus/bitmap.c:35
 hfsplus_file_extend+0xae0/0x1b70 fs/hfsplus/extents.c:469
 hfsplus_get_block+0x408/0x14f0 fs/hfsplus/extents.c:245
 __block_write_begin_int+0x691/0x1930 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2227 [inline]
 cont_write_begin+0x781/0xb40 fs/buffer.c:2566
 hfsplus_write_begin+0x68/0xb0 fs/hfsplus/inode.c:46
 generic_perform_write+0x329/0xa10 mm/filemap.c:4102
 generic_file_write_iter+0x10e/0x5e0 mm/filemap.c:4245
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x70f/0xd10 fs/read_write.c:684
 ksys_write+0x19d/0x2d0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe7bc18d169
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:00007fe7bcf03038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe7bc3a5fa0 RCX: 00007fe7bc18d169
RDX: 0000000000001006 RSI: 0000200000001d00 RDI: 0000000000000007
RBP: 00007fe7bc20e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe7bc3a5fa0 R15: 00007ffdd04714b8
 </TASK>