I get segfault from racketcgc trying to run compile-startup.rkt

https://buildd.debian.org/status/fetch.php?pkg=racket&arch=armhf&ver=7.5%2Bdfsg2-1&stamp=1577755807&raw=0

I can duplicate the segfault in GDB, but the backtrace looks corrupted
at first glance [1].

I'm happy to gather more data if someone has an idea what to try.

We're tracking this in Debian at [0]

[0]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948789
[1]: output from gdb

#0  0xb6ea3254 in malloc_stats () from /lib/arm-linux-gnueabihf/libc.so.6
#1  <function called from gdb>
#2  hamt_make2 (kind=-1368709120, shift=747399, 
    shift@entry=<error reading variable: DWARF-2 expression error: Loop 
detected (257).>, code1=3204429948, 
    key1=0x6, val1=val1@entry=0xb5d15ae8, code2=code2@entry=3204429948, 
key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2594
#3  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#4  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#5  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#6  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#7  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#8  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#9  0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#10 0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599
#11 0x0044c722 in hamt_make2 (kind=<optimized out>, 
    shift=<error reading variable: DWARF-2 expression error: Loop detected 
(257).>, code1=<optimized out>, 
    key1=<optimized out>, val1=val1@entry=0xb5d15ae8, 
code2=code2@entry=3204429948, key2=key2@entry=0xb6916410, 
    val2=val2@entry=0xa) at ./src/racket/src/hash.c:2599

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