[Discuss-gnuradio] Gnu Radio apps freezes (locks up)

[Rickard Radio]

Hi list,

After I upgraded to latest Gnu Radio 3.5.2, and latest UHD (and images), GR 
applications just freeze when running. No warnings, error messages or overflows 
etc. Just freeze. 
A simple FFT plot directly on received samples from the USRPN210 just freezes 
after some seconds, or minutes (depending on the sample rate), although the 
load on the machine is not high. Need to kill GR-app and restart it, with the 
same problem occurring again. 

This has never been a problem with earlier versions of GR/UHD, from about 6 
months ago. 
The freezing happens quicker with high sample rate setting but also with lower, 
eventually. No overflows happen (which was possible to get before with too high 
sample rates or load, etc.) 

The USRPN210 stops sending samples to the computer at the same moment as 
GnuRadio freezes (as observed on the system monitor). 

Same thing happen on two identical laptops running Ubuntu 10.10 (also upgraded 
it from 10.04). Not sure if its a strict GnuRadio problem (since it worked 
before), UHD, or some problem with the Ubuntu Linux 10.10. It work(ed) 
flawlessly with another machine on OSX (before I tried to upgrade GR on it but 
then got stuck...) with identical UHD version and images.

Installation of UHD+GnuRadio with the automatic linux script runs without any 
problems, as before, no errors or warnings. 

Any de-freezing help or clues appreciated!

Rickard