syzbot

loop0: detected capacity change from 0 to 4096
======================================================
WARNING: possible circular locking dependency detected
6.2.0-rc1-syzkaller-00084-gc8451c141e07 #0 Not tainted
------------------------------------------------------
syz-executor474/5063 is trying to acquire lock:
ffff88807660f700 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1122 [inline]
ffff88807660f700 (&ni->ni_lock/4){+.+.}-{3:3}, at: attr_data_get_block+0x32c/0x19f0 fs/ntfs3/attrib.c:919

but task is already holding lock:
ffff88807aab0158 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
ffff88807aab0158 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x159/0x280 mm/util.c:518

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       __might_fault mm/memory.c:5647 [inline]
       __might_fault+0x10c/0x180 mm/memory.c:5640
       _copy_to_user+0x29/0x150 lib/usercopy.c:29
       copy_to_user include/linux/uaccess.h:169 [inline]
       fiemap_fill_next_extent+0x217/0x370 fs/ioctl.c:144
       ni_fiemap+0x2f9/0xc00 fs/ntfs3/frecord.c:1944
       ntfs_fiemap+0xcc/0x120 fs/ntfs3/file.c:1150
       ioctl_fiemap fs/ioctl.c:219 [inline]
       do_vfs_ioctl+0x466/0x15b0 fs/ioctl.c:810
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl fs/ioctl.c:856 [inline]
       __x64_sys_ioctl+0x10c/0x210 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&ni->ni_lock/4){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3097 [inline]
       check_prevs_add kernel/locking/lockdep.c:3216 [inline]
       validate_chain kernel/locking/lockdep.c:3831 [inline]
       __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
       lock_acquire kernel/locking/lockdep.c:5668 [inline]
       lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
       ni_lock fs/ntfs3/ntfs_fs.h:1122 [inline]
       attr_data_get_block+0x32c/0x19f0 fs/ntfs3/attrib.c:919
       ntfs_file_mmap+0x478/0x6a0 fs/ntfs3/file.c:296
       call_mmap include/linux/fs.h:2191 [inline]
       mmap_region+0x6c3/0x1dd0 mm/mmap.c:2621
       do_mmap+0x831/0xf60 mm/mmap.c:1411
       vm_mmap_pgoff+0x1af/0x280 mm/util.c:520
       ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1457
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

1 lock held by syz-executor474/5063:
 #0: ffff88807aab0158 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
 #0: ffff88807aab0158 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x159/0x280 mm/util.c:518

stack backtrace:
CPU: 0 PID: 5063 Comm: syz-executor474 Not tainted 6.2.0-rc1-syzkaller-00084-gc8451c141e07 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3097 [inline]
 check_prevs_add kernel/locking/lockdep.c:3216 [inline]
 validate_chain kernel/locking/lockdep.c:3831 [inline]
 __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
 lock_acquire kernel/locking/lockdep.c:5668 [inline]
 lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x12f/0x1360 kernel/locking/mutex.c:747
 ni_lock fs/ntfs3/ntfs_fs.h:1122 [inline]
 attr_data_get_block+0x32c/0x19f0 fs/ntfs3/attrib.c:919
 ntfs_file_mmap+0x478/0x6a0 fs/ntfs3/file.c:296
 call_mmap include/linux/fs.h:2191 [inline]
 mmap_region+0x6c3/0x1dd0 mm/mmap.c:2621
 do_mmap+0x831/0xf60 mm/mmap.c:1411
 vm_mmap_pgoff+0x1af/0x280 mm/util.c:520
 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1457
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5ba64dfcf9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe29c6bcc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f5ba64dfcf9