[tor-bugs] #6286 [Stem]: test.integ.util.proc tests fail (on linux)

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#6286: test.integ.util.proc tests fail (on linux)
--------------------+-------------------------------------------------------
 Reporter:  neena   |          Owner:  atagar
     Type:  defect  |         Status:  new   
 Priority:  normal  |      Milestone:        
Component:  Stem    |        Version:        
 Keywords:          |         Parent:        
   Points:          |   Actualpoints:        
--------------------+-------------------------------------------------------
 A few test.integ.util.proc tests fail on my machine (running Archlinux).
 I get the following output.

 {{{
 ======================================================================
                          test.integ.util.proc
 ======================================================================

 test_get_connections                                         [FAILURE]
 test_get_cwd                                                 [FAILURE]
 test_get_memory_usage                                        [SUCCESS]
 test_get_stats                                               [FAILURE]
 test_get_uid                                                 [SUCCESS]

 ======================================================================
 ERROR: test_get_connections
 ----------------------------------------------------------------------
 Traceback:
   File "/home/neena/code/tors/stem/test/integ/util/proc.py", line 92, in
 test_get_connections
     for conn in proc.get_connections(tor_pid):
   File "/home/neena/code/tors/stem/stem/util/proc.py", line 281, in
 get_connections
     for fd in os.listdir("/proc/%s/fd" % pid):
 OSError: [Errno 13] Permission denied: '/proc/4291/fd'

 ======================================================================
 ERROR: test_get_cwd
 ----------------------------------------------------------------------
 Traceback:
   File "/home/neena/code/tors/stem/test/integ/util/proc.py", line 26, in
 test_get_cwd
     self.assertEquals(tor_cwd, proc.get_cwd(runner_pid))
   File "/home/neena/code/tors/stem/stem/util/proc.py", line 141, in
 get_cwd
     raise exc
 IOError: unable to read /proc/4291/cwd

 ======================================================================
 ERROR: test_get_stats
 ----------------------------------------------------------------------
 Traceback:
   File "/home/neena/code/tors/stem/test/integ/util/proc.py", line 66, in
 test_get_stats
     command, utime, stime, start_time = proc.get_stats(tor_pid, 'command',
 'utime', 'stime', 'start time')
   File "/home/neena/code/tors/stem/stem/util/proc.py", line 238, in
 get_stats
     raise exc
 IOError: stat file had an unexpected format: /proc/4291/stat

 ----------------------------------------------------------------------
 Ran 5 tests in 0.021s

 FAILED
 }}}

 I'll post more details after I attempt debugging it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6286>
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