syzbot

======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc1-syzkaller-00012-g16a8829130ca #0 Not tainted
------------------------------------------------------
syz-executor184/4990 is trying to acquire lock:
ffff888074ae7700 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
ffff888074ae7700 (&ni->ni_lock#2/4){+.+.}-{3:3}, at: attr_data_get_block+0x46d/0x2da0 fs/ntfs3/attrib.c:918

but task is already holding lock:
ffff88802664f668 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:110 [inline]
ffff88802664f668 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x410 mm/util.c:541

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
       __might_fault+0xba/0x120 mm/memory.c:5732
       _copy_to_user+0x2a/0xa0 lib/usercopy.c:36
       copy_to_user include/linux/uaccess.h:191 [inline]
       fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:144
       ni_fiemap+0x100b/0x1230 fs/ntfs3/frecord.c:1944
       ntfs_fiemap+0x132/0x180 fs/ntfs3/file.c:1137
       ioctl_fiemap fs/ioctl.c:219 [inline]
       do_vfs_ioctl+0x19ba/0x2b10 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:50 [inline]
       do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&ni->ni_lock#2/4){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3108 [inline]
       check_prevs_add kernel/locking/lockdep.c:3227 [inline]
       validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3842
       __lock_acquire+0x1295/0x2000 kernel/locking/lockdep.c:5074
       lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
       __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
       ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
       attr_data_get_block+0x46d/0x2da0 fs/ntfs3/attrib.c:918
       ntfs_file_mmap+0x453/0x7a0 fs/ntfs3/file.c:291
       call_mmap include/linux/fs.h:1873 [inline]
       mmap_region+0xe65/0x2250 mm/mmap.c:2652
       do_mmap+0x8c9/0xf70 mm/mmap.c:1394
       vm_mmap_pgoff+0x1db/0x410 mm/util.c:543
       ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0xc0 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#2/4);
                               lock(&mm->mmap_lock);
  lock(&ni->ni_lock#2/4);

 *** DEADLOCK ***

1 lock held by syz-executor184/4990:
 #0: ffff88802664f668 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:110 [inline]
 #0: ffff88802664f668 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x410 mm/util.c:541

stack backtrace:
CPU: 0 PID: 4990 Comm: syz-executor184 Not tainted 6.4.0-rc1-syzkaller-00012-g16a8829130ca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3108 [inline]
 check_prevs_add kernel/locking/lockdep.c:3227 [inline]
 validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3842
 __lock_acquire+0x1295/0x2000 kernel/locking/lockdep.c:5074
 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5691
 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 ni_lock fs/ntfs3/ntfs_fs.h:1121 [inline]
 attr_data_get_block+0x46d/0x2da0 fs/ntfs3/attrib.c:918
 ntfs_file_mmap+0x453/0x7a0 fs/ntfs3/file.c:291
 call_mmap include/linux/fs.h:1873 [inline]
 mmap_region+0xe65/0x2250 mm/mmap.c:2652
 do_mmap+0x8c9/0xf70 mm/mmap.c:1394
 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543
 ksys_mmap_pgoff+0x4f9/0x6d0 mm/mmap.c:1440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4b4d822d19
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:00007ffd50ef9d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f4b4d822d19
RDX: 0000000000800006 RSI: 000000000000a000 RDI: 0000000020001000
RBP: 00007f4b4d7e