Why does tuna displays incorrect cpu affinity of process when any cpu is offlined?

Issue

• Why does tuna displays incorrect cpu affinity of process when any cpu is offlined?

# sha1sum /dev/zero &
[1] 31182

# taskset -p 31182
pid 31182's current affinity mask: ffff

# taskset -cp 31182
pid 31182's current affinity list: 0-15

# tuna -t sha1sum -P
                      thread       ctxt_switches
    pid SCHED_ rtpri affinity voluntary nonvoluntary             cmd 
  31182  OTHER     0   0xffff         0           51         sha1sum  

crash> eval -b 0xffff
hexadecimal: ffff  
    decimal: 65535  
      octal: 177777
     binary: 0000000000000000000000000000000000000000000000001111111111111111
   bits set: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0     [cpu-list]

AFTER DISABLING CPU
*******************

# chcpu -d 6
CPU 6 disabled

# lscpu|grep line
On-line CPU(s) list:             0-5,7-15
Off-line CPU(s) list:            6

# taskset -cp 31182
pid 31182's current affinity list: 0-5,7-15

# taskset -p 31182
pid 31182's current affinity mask: ffbf   [bits set: 15 14 13 12 11 10 9 8 7 5 4 3 2 1 0]

# tuna -t sha1sum -P
                      thread       ctxt_switches
    pid SCHED_ rtpri affinity voluntary nonvoluntary             cmd 
  31182  OTHER     0   0x7fbf         0          124         sha1sum  
                       ^^^^^^
                        ||||  <----- [ incorrect ]

crash> eval -b 0x7fbf
hexadecimal: 7fbf  
    decimal: 32703  
      octal: 77677
     binary: 0000000000000000000000000000000000000000000000000111111110111111
   bits set: 14 13 12 11 10 9 8 7 5 4 3 2 1 0