Dear QE users and developers,
I am performing calculations of geometry optimization using lfcpopt (QE develop 
version), but the calculation always exited after the first step of the 
optimization. Prior to the second optimization step, It simply stopped after 
the following message:


     Writing output data file ./atop.save/
(exited without any error message)


What's wrong with my calculations? Is it a bug of the code

 &CONTROL
                
 calculation = 'relax' ,
               
 restart_mode = 'from_scratch' ,
                     
 outdir = './' ,
                 
 pseudo_dir = '/home/pc/pseudo/PAW' ,
                     
 prefix = 'atop' ,
                    
 tstress = .true. ,
                    
 tprnfor = .true. ,
                    
 lfcpopt = .TRUE.,
 /
 &SYSTEM
                      
 ibrav = 8,
                  
 celldm(1) = 15.596671813,
                  
 celldm(2) = 1.154699881261,
                  
 celldm(3) = 2.876257,
                        
 nat = 51,
                       
 ntyp = 3,
                    
 ecutwfc = 49 ,
                    
 ecutrho = 411 ,
                
 occupations = 'smearing' ,
                    
 degauss = 0.05D0 ,
                   
 smearing = 'methfessel-paxton' ,
                   
 vdw_corr = 'DFT-D',
                     
 fcp_mu =  0.1854,
         assume_isolated = 'esm',
    
              
esm_bc = 'bc3',
 /
 &ELECTRONS
                
 mixing_beta = 0.2D0 ,
             
diagonalization = 'david' ,
 /
&IONS
/
ATOMIC_SPECIES
    O   15.999  O.pbe-n-kjpaw_psl.1.0.0.UPF 
    H   1.0079  H.pbe-kjpaw_psl.1.0.0.UPF
   Pd   106.40  Pd.pbe-n-kjpaw_psl.1.0.0.UPF 
ATOMIC_POSITIONS angstrom 
H        3.749292613   
5.567569316   9.134421266
H        3.803720062   
4.024397884   9.087662377
O        3.173832077   
4.774393547   9.142099838
Pd      -0.015321105   
9.523398271   6.774164621
Pd       2.722844638   
4.758595557   6.785562209
Pd       5.490883134   
9.523895908   6.777071069
Pd       8.228806411   
4.758298844   6.770864880
Pd       1.356930947   
2.368010181   6.769560450
Pd       4.119325735   
7.149818888   6.768390428
Pd       6.862178456   
2.372021282   6.778917989
Pd       2.738593954   
9.523860670   6.777549970
Pd       5.494886254   
4.759214643   6.766979210
Pd       1.358442938   
7.149196831   6.769444322
Pd       4.118144062   
2.368040151   6.768758108
Pd       6.862965497   
7.145267601   6.777586390
Pd     0.000000000    
6.353486495    4.492593385  0 0 
0       
Pd     2.751140354    
1.588371624    4.492593385  0 0 
0       
Pd     5.502280707    
6.353486495    4.492593385  0 0 
0      
Pd     8.253421061    
1.588371624    4.492593385  0 0 
0       
Pd     1.375570177    
8.736043930    4.492593385  0 0 
0       
Pd     4.126710530    
3.970929059    4.492593385  0 0 
0       
Pd     6.877850884    
8.736043930    4.492593385  0 0 
0       
Pd     2.751140354    
6.353486495    4.492593385  0 0 
0       
Pd     5.502280707    
1.588371624    4.492593385  0 0 
0      
Pd     1.375570177    
3.970929059    4.492593385  0 0 
0       
Pd     4.126710530    
8.736043930    4.492593385  0 0 
0      
Pd     6.877850884    
3.970929059    4.492593385  0 0 
0       
Pd     0.000000000    
3.176743247    2.246296693  0 0 0
Pd     2.751140354    
7.941858119    2.246296693  0 0 
0       
Pd     5.502280707    
3.176743247    2.246296693  0 0 
0       
Pd     8.253421061    
7.941858119    2.246296693  0 0 
0      
Pd     1.375570177    
5.559300683    2.246296693  0 0 
0       
Pd     4.126710530    
0.794185812    2.246296693  0 0 
0      
Pd     6.877850884    
5.559300683    2.246296693  0 0 
0       
Pd     2.751140354    
3.176743247    2.246296693  0 0 
0       
Pd     5.502280707    
7.941858119    2.246296693  0 0 
0       
Pd     1.375570177    
0.794185812    2.246296693  0 0 
0       
Pd     4.126710530    
5.559300683    2.246296693  0 0 
0       
Pd     6.877850884    
0.794185812    2.246296693  0 0 
0       
Pd     0.000000000    
9.530229742    0.000000000  0 0 
0       
Pd     2.751140354    
4.765114871    0.000000000  0 0 
0       
Pd     5.502280707    
9.530229742    0.000000000  0 0 
0      
Pd     8.253421061    
4.765114871    0.000000000  0 0 
0       
Pd     1.375570177    
2.382557436    0.000000000  0 0 
0      
Pd     4.126710530    
7.147672307    0.000000000  0 0 
0      
Pd     6.877850884    
2.382557436    0.000000000  0 0 
0       
Pd     2.751140354    
9.530229742    0.000000000  0 0 
0       
Pd     5.502280707    
4.765114871    0.000000000  0 0 
0       
Pd     1.375570177    
7.147672307    0.000000000  0 0 
0       
Pd     4.126710530    
2.382557436    0.000000000  0 0 
0       
Pd     6.877850884    
7.147672307    0.000000000  0 0 
0       
K_POINTS automatic 
  4 4 1   0 0 0
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