Bash 3.0-2 and kill

Igor Pechtchanski pechtcha@cs.nyu.edu
Sun Jun 26 16:37:00 GMT 2005


Ugh.  Top posting.  Reformatted.

On Sun, 26 Jun 2005, Angelo Graziosi wrote:

> On Fri, 24 Jun 2005, Igor Pechtchanski wrote:
>
> > On Fri, 24 Jun 2005, Angelo Graziosi wrote:
> >
> > > I have noted that when one uses
> > >
> > >    kill -9 <process-PID>
> > >
> > > in bash 3.0-2 (test), the command kills the process but also bash (even
> > > if one uses /bin/kill...).
> > >
> > > In bash 2.05b-17 that command kills only the process.
> > >
> > > These things happen with
> > >
> > >    cygwin 1.5.16-1
> > >    cygwin 1.5.17-1
> > >    snaps. 20050615
> > >    snaps. 20050617
> > >    snaps. 20050621
> > >
> > > (I have listed only the snaps I tried)
> > >
> > > Which is the normal behaviour (3.0-2 or 2.05b-17)?
> >
> > Unless the <process-PID> refers to the bash process itself, it seems that
> > the behavior of 3.0-2 is wrong.  Not sure if it's a bash bug, or a Cygwin
> > signal handling bug exposed by bash (the behavior of /bin/kill seems to
> > point toward the latter).
> >
> > To help debug this, please provide the exact sequence of commands you used
> > to trigger this behavior, as well as the output of "cygcheck -svr" on your
> > system.
> > 	Igor
>
> Suppose that the command "ps" shows that an application, has a PID
> 1234 then
>
>     kill -9 1234
>
> kills the application but also the bash (3.0-2), i.e. closes the windows
> in which bash is running (for example the dos box or xterm).
>
> In some cases, in $HOME there is bash.exe.stackdump.

Can you post the *exact* sequence of commands you run to get bash to die?
Does it happen for any application?

> After these things I have reinstalled Bash 2.05b-17 with which that
> command kills only the application and not bash
> (so that one can continue to work without restarting bash).
>
> The system is W2K SP4.
>
> I have almost all Cygwin packages installed (only gcc-test-suite,
> ghosthscript native, regex, xwinclip are not installed)
>
> Currently I am usin the snapshot 20050624 (after 20050621), but as I wrote
> even with Cygwin 1.5.16-1, 1.5.17-1 bash 3.0-2 is killed.
>
> The Cygwin configuration is quite simple (what setup configures after
> installing)

Still not enough information.  Please review and follow the Cygwin problem
reporting guidelines at <http://cygwin.com/problems.html>, particularly
the part about attaching the output of "cygcheck -svr".

Since you're using the snapshot and have almost all of the packages, it
might also help if you decoded the stackdump you get with addr2line.
	Igor
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