Why doesn't kill work?

[Jesus M. Rodriguez]

Try kill -9 <pid>  sometimes kill doesn't work.  When in doubt -9 it :)
Works everytime.  CTRL+Z simply puts it into the background.

Jesus


On Thu, 27 Jan 2005 21:04:16 -0500, David Liguori <liguorid at albany.edu> wrote:
> In another thread a user having problems with yum killed it.  I am
> curious how he accomplished that.  When I run yum (or any other command,
> for that matter), it stalls, and I stop it with ctrl-z, the following
> happens:
> 
> [1]+  Stopped                 yum update
> [root at tabby ~]# ps
>    PID TTY          TIME CMD
>   6179 pts/0    00:00:00 su
>   6182 pts/0    00:00:00 bash
>   6214 pts/0    00:00:21 yum
>   6220 pts/0    00:00:00 ps
> [root at tabby ~]# kill 6214
> [root at tabby ~]# ps
>    PID TTY          TIME CMD
>   6179 pts/0    00:00:00 su
>   6182 pts/0    00:00:00 bash
>   6214 pts/0    00:00:21 yum ##still running!
>   6221 pts/0    00:00:00 ps
> [root at tabby ~]# exit
> logout
> There are stopped jobs. ##still running!
> [root at tabby ~]#
> 
> As you see, the kill command produces no output here, but if I make up a
> pid at random it complains no such pid exists.
> 
> I'm running a single Athlon 1 gHz processor, if that is important.
> 
> When I search Bugzilla for "kill" the only relevant hits are from ages
> ago in RH 5.1 or so, where a few lines of code run by a non-root user
> could kill any process regardless of owner (the opposite problem).  This
> was apparently fixed and closed.  I considered compiling and running the
> program as root to see if I had better luck than with kill, but it
> doesn't really address the issue.
> 
> Should I file a Bugzilla report, or am I missing something?
> 
>   --
> David Liguori
> 
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