'coercing to Unicode' failed in result submitting step

[Spring Zhang]

Refer to: http://validation.linaro.org/lava-server/scheduler/job/10805/log_file

Traceback (most recent call last):
  File "/srv/lava/instances/production/bin/lava-dispatch", line 77, in <module>
    job.run()
  File "/srv/lava/instances/production/local/lib/python2.7/site-packages/lava_dispatcher/job.py", line 141, in run
    (cmd['command'], unicode(err, 'ascii', 'replace'))
TypeError: coercing to Unicode: need string or buffer, OperationFailed found

[Zygmunt Krynicki (zyga)]

It looks like we need something like this:

try:
   text = unicode(err)
except TypeError:
   text = str(err)
text = str.encode("UTF-8", "replace")

As calling unicode on exception instanced does not seem to convert them to a string representation by calling __unicode__ (sadly).

[Yongqin Liu (liuyq0307)]

this problem should has been fixed by the fix of bug#925396.