======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Not tainted
------------------------------------------------------
syz-executor.3/12373 is trying to acquire lock:
ffff888020b03118 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault mm/memory.c:6233 [inline]
ffff888020b03118 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xe3/0x190 mm/memory.c:6226

but task is already holding lock:
ffff88805bfc9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
ffff88805bfc9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xb6/0x120 fs/ntfs3/file.c:1213

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->ni_lock/4){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752
       ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
       attr_data_get_block+0x30b/0x1b70 fs/ntfs3/attrib.c:914
       ntfs_file_mmap+0x59b/0x7d0 fs/ntfs3/file.c:294
       call_mmap include/linux/fs.h:2107 [inline]
       mmap_region+0x757/0x2760 mm/mmap.c:2886
       do_mmap+0xbc7/0xf60 mm/mmap.c:1397
       vm_mmap_pgoff+0x1ba/0x360 mm/util.c:573
       ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1443
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline]
       __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #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 kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       __might_fault mm/memory.c:6233 [inline]
       __might_fault+0x11b/0x190 mm/memory.c:6226
       _copy_to_user+0x2b/0xc0 lib/usercopy.c:41
       copy_to_user include/linux/uaccess.h:191 [inline]
       fiemap_fill_next_extent+0x232/0x390 fs/ioctl.c:145
       ni_fiemap+0x2f2/0xc10 fs/ntfs3/frecord.c:1948
       ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1215
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x404/0x1ad0 fs/ioctl.c:841
       __do_sys_ioctl fs/ioctl.c:905 [inline]
       __se_sys_ioctl fs/ioctl.c:893 [inline]
       __x64_sys_ioctl+0x116/0x220 fs/ioctl.c:893
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

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.3/12373:
 #0: ffff88805bfc9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1123 [inline]
 #0: ffff88805bfc9e80 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xb6/0x120 fs/ntfs3/file.c:1213

stack backtrace:
CPU: 0 PID: 12373 Comm: syz-executor.3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 __might_fault mm/memory.c:6233 [inline]
 __might_fault+0x11b/0x190 mm/memory.c:6226
 _copy_to_user+0x2b/0xc0 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 fiemap_fill_next_extent+0x232/0x390 fs/ioctl.c:145
 ni_fiemap+0x2f2/0xc10 fs/ntfs3/frecord.c:1948
 ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1215
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x404/0x1ad0 fs/ioctl.c:841
 __do_sys_ioctl fs/ioctl.c:905 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x116/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa551c7cee9
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:00007fa5529cb0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa551dabf80 RCX: 00007fa551c7cee9
RDX: 00000000200000c0 RSI: 00000000c020660b RDI: 000000000000000a
RBP: 00007fa551cc949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa551dabf80 R15: 00007ffcbf5871f8
 </TASK>