[Crash-utility] The "ctrl + c" doesn't work in crash

[Dave Anderson]

----- Original Message -----
> Hi Dave,
> 
> > -----Original Message-----
> > From: crash-utility-bounces at redhat.com
> > [mailto:crash-utility-bounces at redhat.com] On Behalf Of Dave
> > Anderson
> > Sent: Thursday, March 15, 2012 9:31 PM
> > To: Discussion list for crash utility usage, maintenance and
> > development
> > Subject: Re: [Crash-utility] The "ctrl + c" doesn't work in crash
> > 
> > 
> > 
> > ----- Original Message -----
> > > Hi Dave,
> > >
> > > I found the "ctrl + c" doesn't work well in crash. Sometimes, we
> > > may
> > > type a wrong command and want to directly cancel it by "ctrl+c"
> > > like
> > > in the bash. But this combination only do seldom response, what I
> > > mean is I once see it works once or twice.
> > >
> > > I also notice there was a mail thread talking about it:
> > > http://www.redhat.com/archives/crash-utility/2009-October/msg00006.html
> > >
> > > But on the most new crash 6.0.4, simply ctrl+c three times or
> > > more
> > > would not lead to a new prompt...
> > 
> > SIGINT's are always caught, and it depends upon whether the command is
> > currently being fed into the scroller, and in some cases, the command
> > itself.  See the callers of received_SIGINT() for example.
> 
> I see...
> And while I redo the test, I can see SIGINT work again, prompt the
> input > when type three ctrl+c. No idea why previous ctrl+c not
> working...
> 
> I still get a another display issue regarding the ctrl+c.
> I use the "log" command to show the kernel dmesg, and always the
> message buffer is large which cannot be displayed in one screen. So
> I could see the below notice in the foot of the screen:
> -- MORE --  forward: <SPACE>, <ENTER> or j  backward: b or k  quit: q
> 
> If I type "ctrl+c" when the message still not get fully displayed,
> eventually I would see the previous only one foot notice would show
> up several and keep growing.
> Like this:
> [  413.741638] Unable to handle kernel NULL pointer dereference at virtual address 00000000
> [  413.749725] pgd = d3e90000
> [  413.752441] [00000000] *pgd=12109831, *pte=00000000, *ppte=00000000
>  -- MORE --  forward: <SPACE>, <ENTER> or j  backward: b or k  quit: q
>  -- MORE --  forward: <SPACE>, <ENTER> or j  backward: b or k  quit: q
>  -- MORE --  forward: <SPACE>, <ENTER> or j  backward: b or k  quit: q
> 
> And when this abnormal happens, the <space> would be displayed
> normally as before, but when the whole message is drained out, the
> console prompt would not be displayed. And each <enter> after this
> abnormal, would lead to another such notice to be showed up like the
> message buffer itself.
> 
> So is it a bug for the cmdline handling?

Well, it's just the behavior when the "less" scroller is being used.
Why not just do what the prompt says, and just enter "q"?

Dave


I don't fully understand your description, but why not do what the
prompt says, and just type 'q'?

Dave