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dlopen ignores RTLD_GLOBAL when reopening an RTLD_LOCAL library #28058
Description
Reopening an RTLD_LOCAL library with RTLD_GLOBAL succeeds, but its symbols remain unavailable through RTLD_DEFAULT.
Reproduced with Emscripten 6.0.8 on both wasm32 and wasm64.
cat > test.c <<'EOF'
#ifdef BUILD_PROVIDER
int answer_value = 42;
int answer(void) { return answer_value; }
#else
#include <assert.h>
#include <dlfcn.h>
#include <stdio.h>
int main(void) {
void *handle = dlopen("./provider.so", RTLD_NOW | RTLD_LOCAL);
assert(handle);
int (*answer_fn)(void) = dlsym(handle, "answer");
assert(answer_fn && answer_fn() == 42);
puts("Handle-specific lookup: 42");
assert(dlopen("./provider.so", RTLD_NOW | RTLD_GLOBAL) == handle);
dlerror();
answer_fn = dlsym(RTLD_DEFAULT, "answer");
if (!answer_fn) {
printf("FAIL: %s\n", dlerror());
return 1;
}
printf("Global lookup: %d\n", answer_fn());
return 0;
}
#endif
EOFBuild the shared library:
emcc test.c -DBUILD_PROVIDER -shared -fPIC -m64 -fwasm-exceptions -O1 \
-Wl,--export=answer -Wl,--export=answer_value -o provider.soBuild and run the main module:
emcc test.c -m64 -fwasm-exceptions -O1 \
-sMAIN_MODULE=2 -sENVIRONMENT=node -sEXIT_RUNTIME=1 \
--embed-file provider.so -o test.js
node test.jsActual output (exit code 1):
Handle-specific lookup: 42
FAIL: Tried to lookup unknown symbol "answer" in dynamic lib: __main__
Expected: Global lookup: 42.
Replacing both -m64 flags with -m32 produces the same failure.
Activity
anutosh491 commentedon Oct 23, 2026
I tried a fix locally, maybe if someone (cc @sbc100) who confirm the issue is legit i can submit something !