mtv leaves a zombie after exit

[TOMITA Yoshinori]

>> On Sun, 11 May 2003 15:31:52 -0700 (PDT), Doug Barton
>> <DougB at freebsd.org> said:

Do> For some time now on -current whenever I run mtv, it leaves a zombie after
Do> it exits:

Do> USER     PID  PPID %CPU %MEM   VSZ  RSS STAT STARTED      TIME COMMAND
Do> doug       0     1  0.0  0.0     0    0 ZW   -         0:00.00  (mtvp)


While I have never tried mtv, it seems mtv runs in linux mode.
Is this something to do?

I sometimes use a CAD tool, Synopsys DesignCompile of Linux binary.
Just like this case, some processes become zombies.

% ps gaxl|grep ZW
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (mwregcmp)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (regedit)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (regedit)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (regedit)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (regedit)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (mwregcmp)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (regedit)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (mwregcmp)
 1234     0     1   0 -84  0     0    0 -      ZW    p1-   0:00.00  (mwregcmp)

-- 
TOMITA Yoshinori