syzbot

ntfs3: loop0: Different NTFS sector size (4096) and media sector size (512).
======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc4-next-20240418-syzkaller #0 Not tainted
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syz-executor140/5088 is trying to acquire lock:
ffff888077776a18 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xaa/0x120 mm/memory.c:6226

but task is already holding lock:
ffff88807ea0e0e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1122 [inline]
ffff88807ea0e0e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xff/0x180 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}:
       lock_acquire+0x1ed/0x550 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:1122 [inline]
       attr_data_get_block+0x444/0x2e10 fs/ntfs3/attrib.c:931
       ntfs_file_mmap+0x505/0x880 fs/ntfs3/file.c:294
       call_mmap include/linux/fs.h:2106 [inline]
       mmap_region+0xe23/0x2060 mm/mmap.c:2886
       do_mmap+0x8ad/0xfa0 mm/mmap.c:1397
       vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:573
       ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1443
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf5/0x240 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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __might_fault+0xc6/0x120 mm/memory.c:6226
       _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:1215
       ioctl_fiemap fs/ioctl.c:220 [inline]
       do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:841
       __do_sys_ioctl fs/ioctl.c:905 [inline]
       __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf5/0x240 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-executor140/5088:
 #0: ffff88807ea0e0e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1122 [inline]
 #0: ffff88807ea0e0e0 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_fiemap+0xff/0x180 fs/ntfs3/file.c:1213

stack backtrace:
CPU: 0 PID: 5088 Comm: syz-executor140 Not tainted 6.9.0-rc4-next-20240418-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __might_fault+0xc6/0x120 mm/memory.c:6226
 _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:1215
 ioctl_fiemap fs/ioctl.c:220 [inline]
 do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:841
 __do_sys_ioctl fs/ioctl.c:905 [inline]
 __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d6ae769b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef5dde5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffef5dde7c8 RCX: 00007f6d6ae769b9
RDX: 0000000020000280 RSI: 00000000c020660b RDI: 0000000000000005
RBP: 00007f6d6af08610 R08: 0000000000000000 R09: 00007ffef5dde7c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffef5dde7b8 R14: 0000000000