Strange behaviour of luarocks

[Bernd Eggink <monoped@...>]

Since some time (don't know exactly when) any call of 'luarocks', even a 
call without parameters, ends with a segmentation fault. Everything goes 
well until that point, however. Neither re-compiling luarocks from the 
sources nor 'luarocks install luarocks` changes this behaviour.
I'm on Linux, distribution is Crux. This is what 'strace luarocks` 
prints out:

...
write(1, "\tLua version: 5.3\n", 18     Lua version: 5.3
)    = 18
write(1, "\tConfiguration files:\n", 22 Configuration files:
) = 22
write(1, "\t\tSystem: /etc/luarocks/config-5"..., 44            System: 
/etc/luarocks/config-5.3.lua (ok)
) = 44
write(1, "\t\tUser  : /root/.luarocks/config"..., 53            User  : 
/root/.luarocks/config-5.3.lua (not found)
) = 53
write(1, "\n", 1
)                       = 1
write(1, "\tRocks trees in use: \n", 22 Rocks trees in use:
) = 22
write(1, "\t\t/root/.luarocks (\"user\")\n", 27         /root/.luarocks 
("user")
) = 27
write(1, "\t\t/usr (\"system\")\n", 18          /usr ("system")
) = 18
getcwd("/root", 4096)                   = 6
chdir("/")                              = 0
rt_sigaction(SIGINT, {SIG_DFL, [], 
SA_RESTORER|SA_INTERRUPT|SA_NODEFER|SA_RESETHAND, 0x7f1862e71570}, 
{0x4041c0, [], SA_RESTORERUPT|SA_NODEFER|SA_RESETHAND, 0x7f1862e71570}, 
8) = 0
munmap(0x7f1862396000, 2258536)         = 0
munmap(0x7f186215e000, 2322944)         = 0
munmap(0x7f1861f56000, 2128864)         = 0
munmap(0x7f1861d39000, 2213040)         = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, 
si_addr=0x7f1861d44170} ---
+++ killed by SIGSEGV +++
Segmentation fault

Any ideas?

Greetings
Bernd