memory issue while writing to registrydb

[Umesh Singla]

Hi

I'm running into an issue while storing port variants into another table in
the registry database. The output is different every time and breaks at
different places (though I can expect such erroneous behavior in case of
such errors), many times finishing successfully.

The common error which it gives me is:

----
tclsh8.5(25738,0x7fff9815d3c0) malloc: *** error for object 0x7f8e005023b8:
incorrect checksum for freed object - object was probably modified after
being freed.

*** set a breakpoint in malloc_error_break to debug

----

I tried debugging a lot for over a day but not able to find anything.

Sometimes, it gives me a Segmentation fault or Abort error: 6, all of them
indicating an issue with memory management.

If someone can try replicating the error, it'd be great. The repo is here
[1]. The issue seems to be around here [2] in this function. After `make`,
`sudo make install`, all you have to run is `<install-directory>/bin/port
snapshot`.

I am only using vim for development and unable to add any breakpoints and
use GDB since it walks through Tcl.


[1]: https://github.com/umeshksingla/macports-base/tree/gsoc17-migrate

[2]:
https://github.com/umeshksingla/macports-base/blob/gsoc17-migrate/src/cregistry/entry.c#L1422


Thanks
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.macports.org/pipermail/macports-dev/attachments/20170711/f746c58a/attachment.html>