help with racket build failure

[David Bremner <david@tethera.net>]

Dear Arm experts;

Any help with

 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=948789

would be appreciated.

I can replicate the crash on harris, and

cd $HOME/racket-7.5+dfsg1/build  && \
gdb --args ./racketcgc -cu \
$HOME/racket-7.5+dfsg1/src/racket/src/compile-startup.rkt cstartup.inc \
cstartup.zo $HOME/racket-7.5+dfsg1/src/racket/src/startup.inc \
$HOME/racket-7.5+dfsg1/src/racket/src/schvers.h

should get you to the segfault in gdb. The backtrace doesn't make much
sense to me, lots of talk about

  <error reading variable: DWARF-2 expression error: Loop detected (257).>

It's entirely possible racket is doing something odd with signals; I
remember something like using SEGFAULTS in gc.

d