Comment 9 for bug 182923

This backtrace is not useful since it lacks locations. To generate an useful backtrace, you need to build MN with debugging symbols:

  ./jb configure cflags=-g sysconfdir=/etc
  ./jb build
  sudo ./jb install

Then repeat the gdb procedure. Note that to obtain the backtrace of each thread, it is easier to type:

  threads apply all bt

than to manually switch to each thread like you did.

By the way, the above commands are for MN 5.1.