I have reinstall the nvidia drivers from the website but the problem remains. Now, the backtrace is :
/lib/x86_64-linux-gnu/libc.so.6(+0x7eb96)[0x7f337ed0eb96]
/lib/x86_64-linux-gnu/libc.so.6(realloc+0x2de)[0x7f337ed1393e]
/usr/lib/tls/libnvidia-tls.so.319.17(+0x2041)[0x7f3378f25041]
I still try. If anybody has an idea ; il feel stupid but I really cannot fix this.