ntfs3(loop2): Different NTFS sector size (4096) and media sector size (512).
ntfs3(loop2): ino=19, mi_enum_attr
ntfs3(loop2): Mark volume as dirty due to NTFS errors
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.618/10454 is trying to acquire lock:
ffff888035b07360 (mapping.invalidate_lock#14){++++}-{4:4}, at: filemap_fault+0x548/0x1200

but task is already holding lock:
ffff88810aeb9760 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&mm->mmap_lock){++++}-{4:4}:
       lock_acquire+0x120/0x360
       __might_fault+0xcc/0x130
       _copy_to_user+0x2c/0xb0
       fiemap_fill_next_extent+0x1c0/0x390
       ni_fiemap+0x89c/0xbf0
       ntfs_fiemap+0x11d/0x1a0
       do_vfs_ioctl+0x1173/0x1430
       __se_sys_ioctl+0x82/0x170
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&ni->ni_lock#3/5){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       ntfs_fallocate+0x8e6/0x10b0
       vfs_fallocate+0x669/0x7e0
       __x64_sys_fallocate+0xc0/0x110
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (mapping.invalidate_lock#14){++++}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       filemap_fault+0x548/0x1200
       __do_fault+0x138/0x390
       __handle_mm_fault+0x3611/0x5440
       handle_mm_fault+0x40a/0x8e0
       do_user_addr_fault+0x764/0x1390
       exc_page_fault+0x76/0xf0
       asm_exc_page_fault+0x26/0x30
       __get_user_4+0x14/0x20
       mISDN_ioctl+0x115/0x800
       __se_sys_ioctl+0xfc/0x170
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  mapping.invalidate_lock#14 --> &ni->ni_lock#3/5 --> &mm->mmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&mm->mmap_lock);
                               lock(&ni->ni_lock#3/5);
                               lock(&mm->mmap_lock);
  rlock(mapping.invalidate_lock#14);

 *** DEADLOCK ***

2 locks held by syz.2.618/10454:
 #0: ffffffff8f24c6a8 (mISDN_mutex){+.+.}-{4:4}, at: mISDN_ioctl+0x93/0x800
 #1: ffff88810aeb9760 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300

stack backtrace:
CPU: 0 UID: 0 PID: 10454 Comm: syz.2.618 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_read+0x46/0x2e0
 filemap_fault+0x548/0x1200
 __do_fault+0x138/0x390
 __handle_mm_fault+0x3611/0x5440
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0x764/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0010:__get_user_4+0x14/0x20
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 ba 00 f0 ff ff ff 7f 00 00 48 39 d0 48 0f 47 c2 0f 1f 00 <8b> 10 31 c0 0f 1f 00 e9 90 03 04 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004fd7e48 EFLAGS: 00010287
RAX: 0000200000001b00 RBX: dffffc0000000000 RCX: 135ab067110a2600
RDX: 00007ffffffff000 RSI: ffffffff8dba996e RDI: ffffffff8be33f80
RBP: 0000000080044940 R08: 0000000000000000 R09: ffffffff820b89f0
R10: 0000000080044941 R11: 0000000000000002 R12: 0000000000000000
R13: 0000200000001b00 R14: ffff88801e55b100 R15: ffff8880280e7000
 mISDN_ioctl+0x115/0x800
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b45d8ec29
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:00007f8b46b5a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8b45fd5fa0 RCX: 00007f8b45d8ec29
RDX: 0000200000001b00 RSI: 0000000080044940 RDI: 0000000000000009
RBP: 00007f8b45e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b45fd6038 R14: 00007f8b45fd5fa0 R15: 00007ffddd3384c8
 </TASK>
