kicad-developers team mailing list archive

[Lorenzo Marcantonio <l.marcantonio@xxxxxxxxxxxx>]

On Thu, Sep 11, 2014 at 01:00:52PM -0400, Carl Poirier wrote:
> Did you try with the option "allow_pretty_writing_to_this_dir" for the
> corresponding entry in the fp-lib-table ? This way, the writing should be
> saved locally in there, and next time you load the module, you should see
> your changes.

The writing was not the problem; I set the wrong flags for the file
trace:P

However I narrowed down to the incriminated line.

At the end of PCB_IO::FootprintSave there is the sequence

    wxLogTrace( // Uninteresting stuff
    mods.insert( footprintName, new FP_CACHE_ITEM( module, fn ) );
    m_cache->Save();

The problem is in the insert operation. As it's currently I get some
kind of memory corruption and when I do the 'change module' the
bad_alloc pops up.

The minimal not-corrupting code is 

    wxLogTrace( // Uninteresting stuff
    // DUMMIED OUT mods.insert( footprintName, 
    new FP_CACHE_ITEM( module, fn );
    m_cache->Save();

In did it this way to test that the FP_CACHE_ITEM wasn't creating the
problem. In this way the program doesn't get the exception thrown during
the 'change module'. The only thing it is not doing is inserting the new
FP_CACHE_ITEM in the cache. mods is a boost pointer map (and I have *no*
idea on how it's supposed to be used).

Thoughts on what could be going wrong:

- That map object was in some way misused and it broke

- Memory was already somewhat corrupted by *something* and the insert
  call (altough working correctly) put the last nail on the coffin;

- The fact that the cache item is in the cache trigger some bugged code
  flow later (which corrupts the memory)

- That boost map itself is bugged

- g++ is bugged (wouldn't be the first time)

Any genial idea on how to find the real problem? I'm doing a valgrind
memcheck run but it's... well... a quite long procedure :D

At least now it's perfectly reproducible; can someone else test if it
occurs?

-- 
Lorenzo Marcantonio
Logos Srl