Gdb core dump on Linux: get Linux LWP out of pid_t tid out of pthread_t I have a core dump and I want to get a Linux tid of a pthread in it using gdb. I have reached the point using this answer: (gdb) p &this->m_thread->m_state->m_Thread $29 = (pthread_t *) 0x7f05f84bde00 (gdb) p &((struct pthread *)(&this->m_thread->m_state->m_Thread))->tid $28 = (pid_t *) 0x7f05f84be0d0 (gdb) p *&((struct pthread *)(&this->m_thread->m_state->m_Thread))->tid $30 = 136478480 But the value does not look like LWP 2977,...