Since the crash is consistent, can you try a snapshot build from
https://pre.racket-lang.org/ to check whether the crash persists?

The only repair I remember since v6.12 that seems relevant is
55ffc24011. Your crash is consistent with the bug fixed by that commit,
but my guess is that it's something else.

Assuming you do see a crash with the snapshot, then I'll ask that you
run in lldb and disassemble in the vicinity of the crash:

 $ lldb path/to/snapshot/racket
 (lldb) run -l drracket
 [... eventually, a crash at some instruction X ...]
 (llsb) disassem -s (X-100) -e (X+100)

replacing X above with the reported instruction address.

At Sat, 21 Apr 2018 05:11:10 -0500, Philip McGrath wrote:
> In a particular module, I can consistently trigger a segfault by opening
> DrRacket's graphical debugger, setting a breakpoint, and evaluating an
> expression at the REPL. I am using Racket 6.12 on Mac OS 10.13.2: I have
> not (yet) tried to reproduce this on other platforms.
> 
> Unfortunately I don't have anything approaching a minimal example: the file
> that's triggering the issue is part of a large library.
> 
> I've attached the crash report in case that is illuminating. I'm happy to
> help try to find the problem to the extent I can.
> 
> -Philip

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