erlang nif crash

nif_breakage.c

#include "erl_nif.h"

typedef struct private_data_TAG {
	ErlNifResourceType* res_TYPE;
} private_data;

static int load(ErlNifEnv* env, void** priv, ERL_NIF_TERM load_info)
{
	ErlNifResourceFlags flags = (ErlNifResourceFlags)(ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER);

	private_data *pdata = (private_data*)malloc(sizeof(private_data));
	*priv = pdata;
	pdata->res_TYPE = enif_open_resource_type(env, "nif_breakage", "res", NULL, flags, NULL);
	return 0;
}

static int upgrade(ErlNifEnv* env, void** priv, void** old_priv, ERL_NIF_TERM load_info) {
    *priv = *old_priv;
    return 0;
}

static void unload(ErlNifEnv* env, void* priv) {
    return;
}

static ERL_NIF_TERM get_res(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]) {
	private_data *pdata = (private_data*)enif_priv_data(env);
	void *res = enif_alloc_resource(pdata->res_TYPE, 8);
	if (res == NULL) return enif_make_badarg(env);
	ERL_NIF_TERM t = enif_make_resource(env, res);
	enif_release_resource(res);
	return t;
}

static ErlNifFunc nif_funcs[] = {
    {"get_res", 0, get_res}
};

ERL_NIF_INIT(nif_breakage, nif_funcs, &load, NULL, &upgrade, &unload);

nif_breakage.erl

-module(nif_breakage).

-compile([export_all]).

init() ->
  ok = erlang:load_nif("./nif_breakage", 0).

get_res() ->
  erlang:error(nif_not_loaded).

nif_breakage_1.erl

-module(nif_breakage_1).

-compile([export_all]).

wtf() ->
	code:soft_purge(nif_breakage),
	code:load_file(nif_breakage),
	nif_breakage:init(),
	nif_breakage:get_res(),
	wtf().

output

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 5.2.1-23' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 5.2.1 20151028 (Debian 5.2.1-23) 
$ erl -version
Erlang (SMP,ASYNC_THREADS) (BEAM) emulator version 7.1
$ gcc -c -g -Wall -Werror -fpic nif_breakage.c
$ gcc -g -shared -o nif_breakage.so nif_breakage.o
$ erlc nif_breakage.erl
$ erlc nif_breakage_1.erl
$ time erl -noshell -s nif_breakage_1 wtf
Segmentation fault

real    0m0.100s
user    0m0.104s
sys     0m0.008s