Inspect.convert throws KeyError

[Eleni Lixourioti]

Some of my requests seem to be triggering this exception. It's only happening on my live environment so it's quite hard for me to try to manually trigger / debug this further, I don't think it's environment related though. Any ideas?

#!
Request watchdog failed

Stacktrace (most recent call last):


File "dogslow/__init__.py", line 134, in peek
    output += '\n\n'
  File "dogslow/__init__.py", line 69, in stack
    if with_locals:
  File "python2.7/inspect.py", line 885, in formatargvalues
    specs.append(strseq(args[i], convert, join))
  File "python2.7/inspect.py", line 838, in strseq
    return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
  File "python2.7/inspect.py", line 838, in <lambda>
    return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
  File "python2.7/inspect.py", line 840, in strseq
    return convert(object)
  File "python2.7/inspect.py", line 882, in convert
    return formatarg(name) + formatvalue(locals[name])

Exception

#!

Types:  KeyError
Value:  'metric'
Location: python2.7/inspect.py, convert:882

[Eleni Lixourioti]

Edited for readability.

[Erik van Zijst]

I haven't seen that one before and judging from just the stacktrace I don't really have any ideas.

If you can reproduce this reliably, could you insert a log/print statement at dogslow/__init__.py:69 to see what stack frame is causing the problem?

FWIW, you can disable the logging of stack local vars (DOGSLOW_STACK_VARS=False) to work around the issue for now.

[Erik van Zijst]

Did you ever manage to gather more info on this?

[Eleni Lixourioti]

I had to disable dogslow temporarily at the time for other reasons, I only put it back on a couple of days ago. I'm still getting the same issue periodically with various keys causing the error. I have all the local vars of the trace and offending requests logged on sentry now though, so I'll try to do some debugging on the issue beginning of next week.

[Erik van Zijst]

Ok, let me know how you go and if there's anything I can help with.