Error while starting nfsiostat: ValueError: invalid literal for long() with base 10: 'device'

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Experienced this on CentOS6 with version nfs-utils-1.2.3-36.el6.x86_64.

abhijeet.ras@box ~  [ 6:03:57] 
$ sudo nfsiostat 
Traceback (most recent call last):
  File " in="" line="" module="" nfsiostat="" sbin="" usr="">    iostat_command(prog)
  File "/usr/sbin/nfsiostat", line 587, in iostat_command
    devices = list_nfs_mounts(origdevices, mountstats)
  File "/usr/sbin/nfsiostat", line 490, in list_nfs_mounts
  File "/usr/sbin/nfsiostat", line 179, in parse_stats
  File "/usr/sbin/nfsiostat", line 163, in __parse_rpc_line
    self.__rpc_data[op] = [long(word) for word in words[1:]]
ValueError: invalid literal for long() with base 10: 'device'
abhijeet.ras@box ~ 1 [ 6:04:21] 

Going through the code, I noticed that it wasn't able to parse file /proc/self/mountstats correctly. For now, I've added

if line.startswith("no device mounted"):

in the code. Have sent a mail to ML for further discussion.