Antony P Joseph on 3 Jul 2007 18:16:03 -0000


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Re: [PLUG] strace weirdness


Hi
   How about trying with ltrace to see whether the problem fanifests in
it?
With regards
Antony
On Tue, 2007-07-03 at 12:40 -0500, Greg Lopp wrote:
> Sounds like it was a lockup, not a failure.  When he tried to debug
> the problem with strace, the problem did not manifest.  I do so love
> the Heisenbugs[1].
> 
> Is it acceptable to run it via "strace -o /dev/null <program> &" or
> some such? 
> 
> 
> 
> 1] http://en.wikipedia.org/wiki/Heisenbug#Heisenbugs
> 
> 
> On 7/3/07, Mag Gam <magawake@gmail.com> wrote:
>         Is there a 'core' dump? or segment fault? What libraries is
>         the application using (ldd)? 
>          
>         
>          
>         On 7/3/07, Jon Nelson <lists@linuxnotes.net > wrote: 
>                 On Tue, 2007-07-03 at 08:53 -0500, Greg Lopp wrote:
>                 > Is this your program (that you are still debugging)
>                 or a more 
>                 > established package?
>                 >
>                 > Sounds like a race condition.  The processing time
>                 consumed by strace
>                 > overhead may be the element which prevents the
>                 hang.  Can you tell us
>                 > more about the program or "certain keys"? 
>                 >
>                 >
>                 > On 7/3/07, Jon Nelson <lists@linuxnotes.net> wrote:
>                 >         Hi all,
>                 >
>                 >         I have a program that starts up, but after
>                 certain keys are 
>                 >         pressed it
>                 >         hangs.  I used strace to run the program and
>                 it runs fine.  I
>                 >         am
>                 >         baffled.  Is there any obvious reason this
>                 happening?
>                 >
>                 >         Jon 
>                 
>                 I knew I would get that question.  I can't talk about
>                 the specifics of
>                 the program, but let's say that it is a UI with many
>                 options to choose
>                 from on the main screen.  You can arrow to the
>                 different options, but as 
>                 soon as you try to execute one of the options (Enter)
>                 it will freeze.
>                 It also freezes when you try to exit normally (Esc).
>                 
>                 Thanks for the help.
>                 
>                 Jon
>                 
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>         
>         
>         
>         ___________________________________________________________________________
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> 
> ___________________________________________________________________________
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___________________________________________________________________________
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Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion  --   http://lists.phillylinux.org/mailman/listinfo/plug