======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc2-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.362/7105 is trying to acquire lock:
ffff88807d0ac7e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline]
ffff88807d0ac7e0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/memory.c:6355 [inline]
ffff88807d0ac7e0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406

but task is already holding lock:
ffff8880568c8af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline]
ffff8880568c8af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: ntfs_file_write_iter+0xde/0x2380 fs/ntfs3/file.c:1250

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}:
       down_write+0x92/0x200 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ntfs_file_mmap+0x60c/0x780 fs/ntfs3/file.c:397
       call_mmap include/linux/fs.h:2243 [inline]
       mmap_file mm/internal.h:167 [inline]
       __mmap_new_file_vma mm/vma.c:2310 [inline]
       __mmap_new_vma mm/vma.c:2374 [inline]
       __mmap_region+0x1488/0x27c0 mm/vma.c:2476
       mmap_region+0x32b/0x3f0 mm/vma.c:2554
       do_mmap+0xd8e/0x11b0 mm/mmap.c:561
       vm_mmap_pgoff+0x281/0x450 mm/util.c:579
       ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
       __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&mm->mmap_lock){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain kernel/locking/lockdep.c:3909 [inline]
       __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
       lock_acquire kernel/locking/lockdep.c:5866 [inline]
       lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
       down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547
       mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline]
       get_mmap_lock_carefully mm/memory.c:6355 [inline]
       lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406
       do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1360
       handle_page_fault arch/x86/mm/fault.c:1480 [inline]
       exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
       fault_in_readable+0x160/0x200 mm/gup.c:2241
       fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94
       ntfs_compress_write fs/ntfs3/file.c:1114 [inline]
       ntfs_file_write_iter+0x122f/0x2380 fs/ntfs3/file.c:1286
       new_sync_write fs/read_write.c:591 [inline]
       vfs_write+0x5bd/0x1180 fs/read_write.c:684
       ksys_pwrite64 fs/read_write.c:791 [inline]
       __do_sys_pwrite64 fs/read_write.c:799 [inline]
       __se_sys_pwrite64 fs/read_write.c:796 [inline]
       __x64_sys_pwrite64+0x1f4/0x250 fs/read_write.c:796
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0x260 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(&sb->s_type->i_mutex_key#25);
                               lock(&mm->mmap_lock);
                               lock(&sb->s_type->i_mutex_key#25);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

2 locks held by syz.2.362/7105:
 #0: ffff888028db0420 (sb_writers#20){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:791 [inline]
 #0: ffff888028db0420 (sb_writers#20){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:799 [inline]
 #0: ffff888028db0420 (sb_writers#20){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:796 [inline]
 #0: ffff888028db0420 (sb_writers#20){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1f4/0x250 fs/read_write.c:796
 #1: ffff8880568c8af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: inode_trylock include/linux/fs.h:887 [inline]
 #1: ffff8880568c8af0 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: ntfs_file_write_iter+0xde/0x2380 fs/ntfs3/file.c:1250

stack backtrace:
CPU: 0 UID: 0 PID: 7105 Comm: syz.2.362 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079
 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline]
 __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
 lock_acquire kernel/locking/lockdep.c:5866 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
 down_read_killable+0x9e/0x4b0 kernel/locking/rwsem.c:1547
 mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline]
 get_mmap_lock_carefully mm/memory.c:6355 [inline]
 lock_mm_and_find_vma+0x3e7/0x6e0 mm/memory.c:6406
 do_user_addr_fault+0x2ac/0x1370 arch/x86/mm/fault.c:1360
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:fault_in_readable+0x160/0x200 mm/gup.c:2241
Code: 42 e8 45 31 f6 e8 50 1c b8 ff 48 39 eb 75 13 eb 2e e8 44 1c b8 ff 48 81 c3 00 10 00 00 48 39 eb 74 1d e8 33 1c b8 ff 45 89 f7 <8a> 03 31 ff 44 89 fe 88 44 24 28 e8 60 17 b8 ff 45 85 ff 74 d2 e8
RSP: 0018:ffffc900031cfac8 EFLAGS: 00050283
RAX: 0000000000035bb9 RBX: 0000200000001000 RCX: ffffc9000c81e000
RDX: 0000000000080000 RSI: ffffffff8203208d RDI: 0000000000000005
RBP: 0000200000010000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000fcbb
R13: 0000200000000274 R14: 0000000000000000 R15: 0000000000000000
 fault_in_iov_iter_readable+0x101/0x2c0 lib/iov_iter.c:94
 ntfs_compress_write fs/ntfs3/file.c:1114 [inline]
 ntfs_file_write_iter+0x122f/0x2380 fs/ntfs3/file.c:1286
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x5bd/0x1180 fs/read_write.c:684
 ksys_pwrite64 fs/read_write.c:791 [inline]
 __do_sys_pwrite64 fs/read_write.c:799 [inline]
 __se_sys_pwrite64 fs/read_write.c:796 [inline]
 __x64_sys_pwrite64+0x1f4/0x250 fs/read_write.c:796
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff0d7d8d169
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:00007ff0d8b6b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007ff0d7fa5fa0 RCX: 00007ff0d7d8d169
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007ff0d7e0e990 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff0d7fa5fa0 R15: 00007ffc6f23ffc8
 </TASK>
----------------
Code disassembly (best guess):
   0:	42 e8 45 31 f6 e8    	rex.X call 0xe8f6314b
   6:	50                   	push   %rax
   7:	1c b8                	sbb    $0xb8,%al
   9:	ff 48 39             	decl   0x39(%rax)
   c:	eb 75                	jmp    0x83
   e:	13 eb                	adc    %ebx,%ebp
  10:	2e e8 44 1c b8 ff    	cs call 0xffb81c5a
  16:	48 81 c3 00 10 00 00 	add    $0x1000,%rbx
  1d:	48 39 eb             	cmp    %rbp,%rbx
  20:	74 1d                	je     0x3f
  22:	e8 33 1c b8 ff       	call   0xffb81c5a
  27:	45 89 f7             	mov    %r14d,%r15d
* 2a:	8a 03                	mov    (%rbx),%al <-- trapping instruction
  2c:	31 ff                	xor    %edi,%edi
  2e:	44 89 fe             	mov    %r15d,%esi
  31:	88 44 24 28          	mov    %al,0x28(%rsp)
  35:	e8 60 17 b8 ff       	call   0xffb8179a
  3a:	45 85 ff             	test   %r15d,%r15d
  3d:	74 d2                	je     0x11
  3f:	e8                   	.byte 0xe8