loop1: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
6.1.112-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.270/4474 is trying to acquire lock:
ffff88807dbc7958 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xa1/0x110 mm/memory.c:5851

but task is already holding lock:
ffff888058710860 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
ffff888058710860 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xfb/0x170 fs/ntfs3/file.c:1242

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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
       ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
       attr_data_get_block+0x429/0x2520 fs/ntfs3/attrib.c:925
       ntfs_file_mmap+0x460/0x7d0 fs/ntfs3/file.c:387
       call_mmap include/linux/fs.h:2270 [inline]
       mmap_region+0xf96/0x1fa0 mm/mmap.c:2763
       do_mmap+0x8c5/0xf60 mm/mmap.c:1425
       vm_mmap_pgoff+0x1ca/0x2d0 mm/util.c:520
       ksys_mmap_pgoff+0x4f5/0x6d0 mm/mmap.c:1471
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&mm->mmap_lock){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __might_fault+0xbd/0x110 mm/memory.c:5851
       _copy_to_user+0x26/0x130 lib/usercopy.c:36
       copy_to_user include/linux/uaccess.h:169 [inline]
       ni_fiemap+0x5b0/0x1900 fs/ntfs3/frecord.c:2141
       ntfs_fiemap+0x12e/0x170 fs/ntfs3/file.c:1244
       ovl_fiemap+0xe2/0x110 fs/overlayfs/inode.c:579
       ioctl_fiemap fs/ioctl.c:219 [inline]
       do_vfs_ioctl+0x18e9/0x2a90 fs/ioctl.c:810
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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);
  lock(&mm->mmap_lock);

 *** DEADLOCK ***

1 lock held by syz.1.270/4474:
 #0: ffff888058710860 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1101 [inline]
 #0: ffff888058710860 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xfb/0x170 fs/ntfs3/file.c:1242

stack backtrace:
CPU: 1 PID: 4474 Comm: syz.1.270 Not tainted 6.1.112-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __might_fault+0xbd/0x110 mm/memory.c:5851
 _copy_to_user+0x26/0x130 lib/usercopy.c:36
 copy_to_user include/linux/uaccess.h:169 [inline]
 ni_fiemap+0x5b0/0x1900 fs/ntfs3/frecord.c:2141
 ntfs_fiemap+0x12e/0x170 fs/ntfs3/file.c:1244
 ovl_fiemap+0xe2/0x110 fs/overlayfs/inode.c:579
 ioctl_fiemap fs/ioctl.c:219 [inline]
 do_vfs_ioctl+0x18e9/0x2a90 fs/ioctl.c:810
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f301817dff9
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:00007f3019008038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3018335f80 RCX: 00007f301817dff9
RDX: 0000000020000000 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007f30181f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3018335f80 R15: 00007ffd0f9661b8
 </TASK>
syz.1.270 (4474) used greatest stack depth: 19376 bytes left