======================================================
WARNING: possible circular locking dependency detected
6.8.0-rc7-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.3/19648 is trying to acquire lock:
ffff88807c6ff3a0 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xa9/0x120 mm/memory.c:6080

but task is already holding lock:
ffff88803495a5e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
ffff88803495a5e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xff/0x180 fs/ntfs3/file.c:1204

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->ni_lock/4){+.+.}-{3:3}:
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
       attr_data_get_block+0x444/0x2e10 fs/ntfs3/attrib.c:914
       ntfs_file_mmap+0x529/0x820 fs/ntfs3/file.c:294
       call_mmap include/linux/fs.h:2092 [inline]
       mmap_region+0xda6/0x1fa0 mm/mmap.c:2821
       do_mmap+0x7ae/0xe60 mm/mmap.c:1379
       vm_mmap_pgoff+0x1e2/0x420 mm/util.c:556
       ksys_mmap_pgoff+0x503/0x6e0 mm/mmap.c:1425
       do_syscall_64+0xf9/0x240
       entry_SYSCALL_64_after_hwframe+0x6f/0x77

-> #0 (&mm->mmap_lock){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
       __might_fault+0xc5/0x120 mm/memory.c:6080
       _copy_to_user+0x2a/0xb0 lib/usercopy.c:36
       copy_to_user include/linux/uaccess.h:191 [inline]
       fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
       ni_fiemap+0x100b/0x1230 fs/ntfs3/frecord.c:1948
       ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1206
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x1a02/0x2b60 fs/ioctl.c:811
       __do_sys_ioctl fs/ioctl.c:869 [inline]
       __se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
       do_syscall_64+0xf9/0x240
       entry_SYSCALL_64_after_hwframe+0x6f/0x77

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->ni_lock/4);
                               lock(&mm->mmap_lock);
                               lock(&ni->ni_lock/4);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

1 lock held by syz-executor.3/19648:
 #0: ffff88803495a5e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
 #0: ffff88803495a5e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xff/0x180 fs/ntfs3/file.c:1204

stack backtrace:
CPU: 1 PID: 19648 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
 __might_fault+0xc5/0x120 mm/memory.c:6080
 _copy_to_user+0x2a/0xb0 lib/usercopy.c:36
 copy_to_user include/linux/uaccess.h:191 [inline]
 fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
 ni_fiemap+0x100b/0x1230 fs/ntfs3/frecord.c:1948
 ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1206
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x1a02/0x2b60 fs/ioctl.c:811
 __do_sys_ioctl fs/ioctl.c:869 [inline]
 __se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f239267dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f23933820c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f23927abf80 RCX: 00007f239267dda9
RDX: 0000000020000080 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007f23926ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f23927abf80 R15: 00007ffc5a2d05b8
 </TASK>