Strange niceness value on WSL

[Bu11etmagnet]

I was running nice ninja -j10 -k0 all check-all on WSL Ubuntu, and started htop in a second WLS window. The output looked like this:

  1  [|||||        20.8%]   4  [|||||||      33.8%]   7  [|             4.0%]   10 [              0.0%]
  2  [||||         13.9%]   5  [|||          10.5%]   8  [|             1.3%]   11 [|             4.0%]
  3  [|||||||||    45.0%]   6  [              0.0%]   9  [|             3.3%]   12 [              0.0%]
  Mem[||||||||||||||||||||||           6.89G/16.0G]   Tasks: 23, 4 thr; 2 running
  Swp[|||                              1005M/19.5G]   Load average: 0.52 0.58 0.59
                                                      Uptime: 05:09:02

  PID USER      PRI  NI  VIRT   RES   SHR S CPU% MEM%   TIME+  Command                                        
    1 root       20   0  8896   276   240 S  0.0  0.0  0:00.09 /init                                         
 3534 root       20   0  8896   216   172 S  0.0  0.0  0:00.00 ├─ /init                                       
 3535 csaba      20   0 16888  3504  3424 S  0.0  0.0  0:00.10 │  └─ -bash
 3617 csaba      20   0 16720  3656  1612 R  0.0  0.0  0:00.18 │     └─ htop
    6 root       20   0  8896   164   120 S  0.0  0.0  0:00.00 ├─ /init
    7 csaba      20   0 17020  3412  3268 S  0.0  0.0  0:00.26 │  └─ -bash
 9418 csaba      10 4294967286  127M 19212   416 S  0.0  0.1  0:10.16 │     └─ ninja -j10 -k0 all check-all
18411 csaba      10 4294967286 10660   592   560 S  0.0  0.0  0:00.00 │        └─ /bin/sh -c cd /home/csaba/w
18412 csaba      10 4294967286 2580M  869M 46384 S  0.0  5.3  1:23.40 │           └─ /usr/bin/python2.7 /home
18641 csaba      10 4294967286 2580M  869M 46384 S  0.0  5.3  0:39.75 │              ├─ /usr/bin/python2.7 /h
18640 csaba      10 4294967286 2580M  869M 46384 S  0.0  5.3  0:22.96 │              ├─ /usr/bin/python2.7 /h
18639 csaba      10 4294967286 2580M  869M 46384 S  0.0  5.3  0:01.07 │              ├─ /usr/bin/python2.7 /h
18638 csaba      10 4294967286  130M 11848 10388 S  0.0  0.1  2:06.02 │              ├─ /usr/bin/python2.7 /h
18637 csaba      10 4294967286  130M 37092 35000 S  0.0  0.2  2:07.55 │              ├─ /usr/bin/python2.7 /h
18636 csaba      10 4294967286  130M 37044 35020 S  0.0  0.2  2:00.30 │              ├─ /usr/bin/python2.7 /h
18635 csaba      10 4294967286  131M 38712 36544 S  0.0  0.2  2:07.46 │              ├─ /usr/bin/python2.7 /h
18634 csaba      10 4294967286  130M 36688 34672 S  0.0  0.2  1:58.85 │              ├─ /usr/bin/python2.7 /h
18633 csaba      10 4294967286  130M 36816 34820 S  0.0  0.2  2:06.64 │              ├─ /usr/bin/python2.7 /h
18632 csaba      10 4294967286  129M 36076 34712 S  0.0  0.2  2:03.88 │              ├─ /usr/bin/python2.7 /h
 8856 csaba      10 4294967286 12180  1552  1476 S  0.0  0.0  0:00.04 │              │  └─ /bin/bash /home/cs
 8921 csaba      10 4294967286  100T  2452  1432 R 100.  0.0  2h39:33 │              │     └─ /home/csaba/wk/
18631 csaba      10 4294967286  130M 36932 34812 S  0.0  0.2  2:02.29 │              ├─ /usr/bin/python2.7 /h
18630 csaba      10 4294967286  129M 36072 34104 S  0.0  0.2  1:56.90 │              ├─ /usr/bin/python2.7 /h
18629 csaba      10 4294967286  129M 35564 34356 S  0.0  0.2  2:02.48 │              ├─ /usr/bin/python2.7 /h
18628 csaba      10 4294967286  130M 36872 33792 S  0.0  0.2  2:01.04 │              ├─ /usr/bin/python2.7 /h
18627 csaba      10 4294967286  129M 35652 34304 S  0.0  0.2  2:09.10 │              └─ /usr/bin/python2.7 /h
    5 root       20   0  8896   276   240 S  0.0  0.0  0:00.00 └─ /init

Note the value 4294967286 for the NI column. This is consistent with what ps reported:

ps -eo pid,user,pri,ni,args --sort user
  PID USER     PRI  NI COMMAND
    7 csaba     19   0 -bash
11896 csaba     19   0 -bash
11926 csaba     29 4294967286 ninja -j10 -k0 all check-all
12454 csaba     29 4294967286 /bin/sh -c cd /home/csaba/wk/llvm

However, htop is seemingly not prepared for such a value, and the columns get out of alignment.

Either htop should be able to display such a large "nice" value, or 4294967286 could be special-cased.