interesting observation, nur the root cause is still a mystery. Could be related to CUDA or could be something I did to the code...
My only idea:
root@linux:~# screen -dm CudaMiner/cudaminer --benchmark; sleep 1; screen -ls
No Sockets found in /var/run/screen/S-root.
root@linux:~# gdb screen
GNU gdb (GDB) 7.6.1-ubuntu
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
...
Reading symbols from /usr/bin/screen...(no debugging symbols found)...done.
(gdb) set args -dm CudaMiner/cudaminer --benchmark
(gdb) run
Starting program: /usr/bin/screen -dm CudaMiner/cudaminer --benchmark
[Inferior 1 (process 4349) exited normally]
(gdb)
(and second observation: if you run screen and then you run cudaminer inside - all is OK)