loop7: detected capacity change from 0 to 4096
ntfs3(loop7): ino=21, "file1" fallocate(0x10) is not supported
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.505/9675 is trying to acquire lock:
ffff888111768c90 (mapping.invalidate_lock#3){++++}-{4:4}, at: filemap_fault+0x548/0x1200

but task is already holding lock:
ffff88802bbec260 (&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+0x391/0xbf0
       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#2/5){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x187/0x1350
       ntfs_fallocate+0x7c4/0x10b0
       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#3){++++}-{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
       fault_in_readable+0x8e/0x130
       fault_in_iov_iter_readable+0x1b4/0x2f0
       generic_perform_write+0x7b5/0x900
       ntfs_file_write_iter+0x746/0x870
       vfs_write+0x5c9/0xb30
       __x64_sys_pwrite64+0x193/0x220
       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#3 --> &ni->ni_lock#2/5 --> &mm->mmap_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&mm->mmap_lock);
                               lock(&ni->ni_lock#2/5);
                               lock(&mm->mmap_lock);
  rlock(mapping.invalidate_lock#3);

 *** DEADLOCK ***

3 locks held by syz.7.505/9675:
 #0: ffff88803d09a428 (sb_writers#18){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
 #1: ffff888111768af0 (&sb->s_type->i_mutex_key#22){+.+.}-{4:4}, at: ntfs_file_write_iter+0x7a/0x870
 #2: ffff88802bbec260 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300

stack backtrace:
CPU: 0 UID: 0 PID: 9675 Comm: syz.7.505 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:fault_in_readable+0x8e/0x130
Code: a9 00 00 00 0f 1f 00 0f ae e8 4d 85 f6 40 0f 95 c5 4c 89 ff 4c 89 f6 e8 00 05 b8 ff 4d 39 f7 0f 97 c0 40 84 c5 74 43 4d 89 f5 <41> 8a 45 00 88 44 24 07 49 81 e5 00 f0 ff ff 4d 8d a5 00 10 00 00
RSP: 0018:ffffc900040efa88 EFLAGS: 00010202
RAX: ffffffff8207ac01 RBX: 0000000000000184 RCX: ffff888107380000
RDX: 0000000000000002 RSI: 0000200000000140 RDI: 00002000000002c4
RBP: dffffc0000000001 R08: ffff888107380000 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000002 R12: 00007ffffffff000
R13: 0000200000000140 R14: 0000200000000140 R15: 00002000000002c4
 fault_in_iov_iter_readable+0x1b4/0x2f0
 generic_perform_write+0x7b5/0x900
 ntfs_file_write_iter+0x746/0x870
 vfs_write+0x5c9/0xb30
 __x64_sys_pwrite64+0x193/0x220
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdac638eba9
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:00007fdac7261038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fdac65d5fa0 RCX: 00007fdac638eba9
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007fdac6411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000e7c R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdac65d6038 R14: 00007fdac65d5fa0 R15: 00007ffcfc67d0f8
 </TASK>
