[chuck-users] Debugging Segmentation fault: 11

Gonzalo gonzalo at dense13.com
Tue Jan 27 16:27:58 EST 2015


Thanks Joel. One more hiccup: I start my chuck program with:

date +"%y%m%d-%T" | chuck wp.ck

(I need it to have a timestamp)

But I can't do that in gdb. I can disable the timestamp part in the 
code, but just checking to see if this is possible.


On 28/01/2015 8:01 am, Joel Matthys wrote:
> I assume you're on Linux or OSX. (If it's Windows, I'm clueless.)
>
> For me on Ubuntu I type:
>
> $ *gdb chuck*
>
> and then once it starts up and I get the (gdb) prompt I type:
>
> (gdb) *run my_chuck_file.ck*
>
> Of course GDB slows down your system, A LOT, but you can keep it running
> until it hits the segfault. The spew should (hopefully) point toward a
> specific place in the chuck code that is the problem. (Type q to exit
> gdb.) You might want to copy the error messages here for the devs to
> look into.
>
> Joel
>
> On 01/27/2015 02:53 PM, Gonzalo wrote:
>> Never used gdb before, I'll read about this, but any pointers on how
>> to get started?
>>
>>
>> On 28/01/2015 7:39 am, Joel Matthys wrote:
>>> It's hard to debug segfaults in the ChucK code itself. running gdb chuck
>>> might help narrow down the problem.
>>>
>>> Joel
>>>
>>> On 01/27/2015 02:31 PM, Gonzalo wrote:
>>>> Hi,
>>>>
>>>> On a project I'm working on, I sometimes get a "Segmentation fault:
>>>> 11" error, and the program crashes. But I can't figure out when it
>>>> happens, and cannot reproduce it. It's a big project, with many
>>>> components communicating via events, and I have no idea who's
>>>> triggering the problem. My question is how would you go about
>>>> debugging this? Any ideas what can be triggering it? It sounds very
>>>> generic...
>>>>
>>>> Probably unrelated, but just in case, I also got this (only once so
>>>> far):
>>>>
>>>> chuck(22226,0x7fff790ee310) malloc: *** error for object 0x1028f3408:
>>>> incorrect checksum for freed object - object was probably modified
>>>> after being freed.
>>>> *** set a breakpoint in malloc_error_break to debug
>>>> Abort trap: 6
>>>>
>>>> Thanks!
>>>> Gonzalo
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>>>
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