Memory management in Julia

[Madeleine Udell]

Hi all,

I'm running into some memory management issues: in particular, a malloc error that claims I am modifying an object after freeing it: see this question. The error is, 

julia(9849,0x7fff705d0300) malloc: *** error for object 0x7f96a332f408: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug

I'm not sure how to debug it: what's the best way to search for code that might be modifying an object after freeing it in Julia? (For example, I don't know what or where malloc_error_break is.)

Thanks!

Madeleine

[Yichao Yu]

Which platform is this and how repeatable is it?

>
> Thanks!
> Madeleine

[Madeleine Udell]

This is on a mac; we've got a variety of function calls giving errors, some with probability ~.5 and some every time we've run them.

--

Madeleine Udell

Postdoctoral Fellow at the Center for the Mathematics of Information

California Institute of Technology

https://courses2.cit.cornell.edu/mru8

(415) 729-4115

[Matt Bauman]

Can you reproduce it if you run julia with the --check-bounds=yes command line argument?

[Madeleine Udell]

Fantastic! That helped me track down the problem and it's working now.