======================================================
WARNING: possible circular locking dependency detected
6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Not tainted
------------------------------------------------------
syz.4.6083/22945 is trying to acquire lock:
ffff888027a6a8e0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault mm/memory.c:6751 [inline]
ffff888027a6a8e0 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0xe3/0x190 mm/memory.c:6744

but task is already holding lock:
ffff88823bfe6100 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
ffff88823bfe6100 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_fiemap+0xb6/0x120 fs/ntfs3/file.c:1350

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ni->ni_lock#2/5){+.+.}-{4:4}:
       __mutex_lock_common kernel/locking/mutex.c:585 [inline]
       __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735
       ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
       attr_data_get_block+0x307/0x1d10 fs/ntfs3/attrib.c:917
       ntfs_file_mmap+0x577/0x780 fs/ntfs3/file.c:369
       call_mmap include/linux/fs.h:2183 [inline]
       mmap_file mm/internal.h:124 [inline]
       __mmap_new_file_vma mm/vma.c:2291 [inline]
       __mmap_new_vma mm/vma.c:2355 [inline]
       __mmap_region+0x1789/0x2670 mm/vma.c:2456
       mmap_region+0x270/0x320 mm/mmap.c:1347
       do_mmap+0xc00/0xfc0 mm/mmap.c:496
       vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588
       ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:542
       __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/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){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
       lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
       __might_fault mm/memory.c:6751 [inline]
       __might_fault+0x11b/0x190 mm/memory.c:6744
       _inline_copy_to_user include/linux/uaccess.h:192 [inline]
       _copy_to_user+0x2d/0xd0 lib/usercopy.c:26
       copy_to_user include/linux/uaccess.h:225 [inline]
       ni_fiemap+0xbe9/0xdb0 fs/ntfs3/frecord.c:2139
       ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1352
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x405/0x1990 fs/ioctl.c:840
       __do_sys_ioctl fs/ioctl.c:904 [inline]
       __se_sys_ioctl fs/ioctl.c:892 [inline]
       __x64_sys_ioctl+0x11d/0x200 fs/ioctl.c:892
       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#2/5);
                               lock(&mm->mmap_lock);
                               lock(&ni->ni_lock#2/5);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

1 lock held by syz.4.6083/22945:
 #0: ffff88823bfe6100 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ni_lock fs/ntfs3/ntfs_fs.h:1109 [inline]
 #0: ffff88823bfe6100 (&ni->ni_lock#2/5){+.+.}-{4:4}, at: ntfs_fiemap+0xb6/0x120 fs/ntfs3/file.c:1350

stack backtrace:
CPU: 0 UID: 0 PID: 22945 Comm: syz.4.6083 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
 __might_fault mm/memory.c:6751 [inline]
 __might_fault+0x11b/0x190 mm/memory.c:6744
 _inline_copy_to_user include/linux/uaccess.h:192 [inline]
 _copy_to_user+0x2d/0xd0 lib/usercopy.c:26
 copy_to_user include/linux/uaccess.h:225 [inline]
 ni_fiemap+0xbe9/0xdb0 fs/ntfs3/frecord.c:2139
 ntfs_fiemap+0xc9/0x120 fs/ntfs3/file.c:1352
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x405/0x1990 fs/ioctl.c:840
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl fs/ioctl.c:892 [inline]
 __x64_sys_ioctl+0x11d/0x200 fs/ioctl.c:892
 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: 0033:0x7f7ac957e819
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:00007f7aca3cc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7ac9735fa0 RCX: 00007f7ac957e819
RDX: 00000000200004c0 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007f7ac95f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7ac9735fa0 R15: 00007fff8405d578
 </TASK>