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From: "alxchk at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug nptl/24776] pthread_key_create, pthread_setspecific are
 incompatible with dlmopen
Date: Sun, 08 Aug 2021 05:15:24 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D24776

Oleksii Shevchuk <alxchk at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alxchk at gmail dot com

--- Comment #11 from Oleksii Shevchuk <alxchk at gmail dot com> ---
/tmp > cat ldr.c=20
#define _GNU_SOURCE
#include <dlfcn.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

int main() {
    pthread_key_t key =3D 0xFFFFFFFF;
    pthread_key_create(&key, NULL);
    pthread_setspecific(key, (void*) 0xDEADBEEF);
    printf("[tid=3D%lx] Key created: %u with value %p\n", pthread_self(), k=
ey,
pthread_getspecific(key));

    printf("[New LMID]\n");
    void *ldr2 =3D dlmopen(LM_ID_NEWLM, "./ldr2.so", RTLD_NOW | RTLD_LOCAL);
    if (!ldr2) {
        printf("ERR: %s\n", dlerror());
        return -1;
    }

    printf("[Base LMID]\n");
    ldr2 =3D dlmopen(LM_ID_BASE, "./ldr2.so", RTLD_NOW | RTLD_LOCAL);
    if (!ldr2) {
        printf("ERR: %s\n", dlerror());
        return -1;
    }

    return 0;
}


/tmp > cat ldr2.c
#define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h>

void init(int, char*[], char*[]) {
    pthread_key_t key =3D 0xFFFFFFFF;
    pthread_key_create(&key, NULL);
    printf("[tid=3D%lx] Key created: %u\n", pthread_self(), key);
    printf("[tid=3D%lx] Key value: %p\n", pthread_self(),
pthread_getspecific(key));
}

__attribute__((section(".init_array"))) void (* __init)(int, char*[], char*=
[])
=3D init;


/tmp > gcc -o ldr ldr.c -pthread  -ldl
/tmp > gcc -shared -o ldr2.so ldr2.c -pthread=20=20=20=20=20
/tmp > ./ldr
[tid=3D7fe649b0a740] Key created: 0 with value 0xdeadbeef
[New LMID]
[tid=3D7fe649b0a740] Key created: 0
[tid=3D7fe649b0a740] Key value: 0xdeadbeef
[Base LMID]
[tid=3D7fe649b0a740] Key created: 2
[tid=3D7fe649b0a740] Key value: (nil)


Pain..

--=20
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