(gdb) info threads 
  Id   Target Id                         Frame 
* 1    Thread 0x7f14e17d2700 (LWP 34536) __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
  2    Thread 0x7f14e27d4700 (LWP 34534) futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f14e27d3a00, clockid=<optimized out>, expected=0, futex_word=0x558e4a8c9524)
    at ../sysdeps/nptl/futex-internal.h:320
  3    Thread 0x7f14e1fd3700 (LWP 34535) futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f14e1fd2c40, clockid=<optimized out>, expected=0, futex_word=0x558e4a8d12a0)
    at ../sysdeps/nptl/futex-internal.h:320
  4    Thread 0x7f085bfff700 (LWP 34538) 0x00007f14e2c238e6 in __GI___mmap64 (offset=0, fd=-1, flags=16418, prot=0, len=67108864, addr=0x7f0848000000) at ../sysdeps/unix/sysv/linux/mmap64.c:59
  5    Thread 0x7f14e0fd1700 (LWP 34537) std::back_insert_iterator<fmt::v8::detail::buffer<char> >::back_insert_iterator (this=0x7f14e0fcf740, __x=warning: RTTI symbol not found for class 'fmt::v8::basic_memory_buffer<char, 250ul, std::allocator<char> >'
...) at /usr/include/c++/10/bits/stl_iterator.h:614
  6    Thread 0x7f085a7fc700 (LWP 34541) futex_lock_pi (private=128, abstime=0x0, futex_word=0x7f14e30c5100) at ../sysdeps/nptl/futex-internal.h:412
  7    Thread 0x7f085affd700 (LWP 34540) 0x00007f14e2c2a46e in epoll_wait (epfd=11, events=0x7f085affc4e0, maxevents=128, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
  8    Thread 0x7f14e2b06800 (LWP 34533) __pthread_clockjoin_ex (threadid=139727659149056, thread_return=0x0, clockid=<optimized out>, abstime=<optimized out>, block=<optimized out>)
    at pthread_join_common.c:145
  9    Thread 0x7f085b7fe700 (LWP 34539) futex_lock_pi (private=128, abstime=0x0, futex_word=0x7f14e30c5100) at ../sysdeps/nptl/futex-internal.h:412
(gdb)