[racket] why a segfault on the command line, but not in DrRacket?

From: Matthew Butterick (mb at mbtype.com)
Date: Tue Dec 30 14:43:51 EST 2014

No, it's all Racket libraries.

OTOH I may be the one causing the memory-management problems. The issues
are arising in my typesetting program, which passes around some large data
structures as function inputs. By "large" I mean a list of 10e5 to 10e6
structs, each with its own hashtable. Perhaps this is imprudent. It
certainly makes the GC huff and puff (about 25-30% of my running time is

OTOOH, it does seem to be a command-line peculiarity, because I haven't
found a similar limit for DrRacket yet. For instance, I just typeset a file
with 1.5M characters, resulting in a ~600 page PDF, and it ran fine.

When I tried running on the command line with this input, I got a different
error than before (and within a couple seconds of starting the program):

Seg fault (internal error during gc) at 0x10aac0000
Bus error: 10 (core dumped)

On Tue, Dec 30, 2014 at 11:09 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> Does your program use any foreign libraries? That behavior sounds typical
> of memory-management problems.
> > On Dec 30, 2014, at 11:47 AM, Matthew Butterick <mb at mbtype.com> wrote:
> >
> > I have a program that consistently works in DrRacket regardless of input
> size.
> >
> > But on the command line, once input exceeds a certain threshold, the
> program consistently dies with a "Segmentation fault: 11 (core dumped)"
> error (though it works with smaller files). I'm invoking `racket` without
> any special flags, like so:
> >
> > racket main.rkt
> >
> > I know which line of my program is triggering the segfault. But since
> the error is related to the input size and the use of command-line Racket,
> I think I ought to look elsewhere for the cause.
> >
> > Are there particular command-line flags that can be helpful in
> diagnosing segfaults? Is a segfault like this typically due to running out
> of memory?
> > ____________________
> >  Racket Users list:
> >  http://lists.racket-lang.org/users
> >
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