In case the UrBackup server crashes on Linux a gdb stacktrace is a very helpful tool in finding the cause of the crash.

You'll need a self-compiled version of the UrBackup server, as the precompiled versions do not include debugging information. See e.g. here for how it is done
You need to have the gdb debugger installed
With UrBackup server > 2.0:
1. Run the UrBackup server via
  gdb --args urbackupsrv run -v debug
  If you want to log off while it runs, run it in screen
With UrBackup Server >= 1.3:
1. Run the UrBackup server via
  start_urbackup_server --loglevel debug --run_in_gdb
  If you want to log off while it runs, run it in screen
If log rotation is enabled enter "handle SIGHUP nostop" in the gdb command prompt to prevent gdb from stopping during log rotation
Enter run in the gdb command prompt to start the server
Once it crashed enter bt to get information on the location where it crashed.

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