I know this issue is closed, but for someone who needs to see the exact test
case using which how this bug is reproduced by simple C test code, please find
below simple C test case:
***************************** Source Code ***********************************
yogesh$ cat lib1.c
#include <stdio.h>
int lib1_func()
{
return lib2_func();
}
----------------------------------------------
yogesh$ cat lib2.c
#include <stdio.h>
int lib2_func()
{
return 10;
}
----------------------------------------------
yogesh$ cat main.c
#include <stdio.h>
#include <dlfcn.h>
#include <pthread.h>
void *handle;
static void *thread_abc()
{
handle = dlopen ("./lib1.so", RTLD_LAZY | RTLD_GLOBAL);
void *func = dlsym (handle, "lib2_func");
printf ("<thread_abc> Handle:%p, func:%p \n", handle, func);
dlclose (handle);
return NULL;
}
static void *thread_xyz()
{
handle = dlopen ("./lib1.so", RTLD_LAZY | RTLD_GLOBAL);
void *func = dlsym (handle, "lib2_func");
printf ("<thread_xyz> Handle:%p, func:%p \n", handle, func);
dlclose (handle);
return NULL;
}
int main()
{
pthread_t abc_arr[1000], xyz_arr[1000];
int i=0;
handle = dlopen ("./lib1.so", RTLD_LAZY | RTLD_GLOBAL);
void *func = dlsym (handle, "lib2_func");
printf ("<main> Handle:%p, func:%p \n", handle, func);
for (i=0;i<10;i++)
{
pthread_create(&abc_arr[i], NULL, thread_abc, NULL);
pthread_create(&xyz_arr[i], NULL, thread_xyz, NULL);
}
printf ("<main> Handle:%p, func:%p \n", handle, func);
dlclose (handle);
for (i=0;i<1000;i++)
{
pthread_create(&abc_arr[i], NULL, thread_abc, NULL);
pthread_create(&xyz_arr[i], NULL, thread_xyz, NULL);
}
for (i=0;i<10;i++)
{
pthread_join(abc_arr[i], NULL);
pthread_join(xyz_arr[i], NULL);
}
printf ("Returning from main\n");
return 0;
}
************************** Compilation steps *********************
gcc -g -fPIC -shared -o lib2.so lib2.c &&
gcc -g -fPIC -shared -o lib1.so lib1.c ./lib2.so &&
gcc -g main.c ./lib1.so ./lib2.so -ldl -lpthread
*******************************************************************
With the above test case this issue is 100% reproducible.
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https://bugs.launchpad.net/bugs/893605
Title:
crashes with glibc-2.14/2.15 on dlopen (seen with kvm and gnucash)
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