As I wrote in the Debian bugreport about this, Linux no longer allows non-root users to get at the per-process I/O throughput information needed by iotop, as a result if it causing security issues (CVE-2011-2494):
https://lkml.org/lkml/2011/10/1/170
The crash itself will be replaced by an error when iotop is next syncronised from Debian.
As I wrote in the Debian bugreport about this, Linux no longer allows non-root users to get at the per-process I/O throughput information needed by iotop, as a result if it causing security issues (CVE-2011-2494):
https:/ /lkml.org/ lkml/2011/ 10/1/170
The crash itself will be replaced by an error when iotop is next syncronised from Debian.