(gdb) thread apply all bt

Thread 5 (Thread 0x7fffe3fff700 (LWP 12802)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00000000010abf6b in boost::condition_variable::wait(boost::unique_lock<boost::mutex>&) ()
#2  0x00000000010adac9 in fc::thread_d::process_tasks() ()
#3  0x00000000010adbd4 in fc::thread_d::start_process_tasks(long) ()
#4  0x00000000017e7eb1 in make_fcontext ()
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7fd8780 (LWP 12798)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x000000000179a0c3 in boost::thread::join_noexcept() ()
#2  0x00000000010b5fa8 in fc::asio::default_io_service_scope::~default_io_service_scope() ()
#3  0x00007ffff66f3ff8 in __run_exit_handlers (status=0, listp=0x7ffff6a7e5f8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:82
#4  0x00007ffff66f4045 in __GI_exit (status=<optimized out>) at exit.c:104
#5  0x00007ffff66da837 in __libc_start_main (main=0xacddf0 <main>, argc=6, argv=0x7fffffffe4b8, init=<optimized out>, fini=<optimized out>,
    rtld_fini=<optimized out>, stack_end=0x7fffffffe4a8) at ../csu/libc-start.c:325
#6  0x0000000000ad3bb9 in _start ()