On an i386-architecture chroot running under an amd64 vm running under a MacBook Pro ( :D ), the following command reproduced at least half the time I ran it:
$ w3m -T text/html -dump libX11-keys.proc >/dev/null The GC would attempt to complain about allocating large-sized blocks, and this would trigger the symptoms. 64-bit systems may have a tougher time, perhaps to their relatively larger address space.
libX11-keys.proc.xz
Description: Binary data
