927001 - stackwalker not properly escaping with json output

Status: RESOLVED INVALID

(Toolkit :: Crash Reporting, defect)

Description

[K Lars Lohn [:lars] [:klohn]]

Attachment: err.json

I've traced a problem down to the stackwalker program emitting invalid json.  

ValueError: Invalid \escape: line 1 column 27627 (char 27627)

Comment 1

[K Lars Lohn [:lars] [:klohn]]

a crash that demonstrates this issue is de338c41-8ada-4112-895c-e871a2131015 on staging.  I do not have an example from prod.  If you cannot get this crash dump for some reason, I've got it already downloaded and I can send it to you via SD card tied to a carrier pigeon.

Comment 2

[(not currently active) Ted Mielczarek]

It appears to be barfing on:
"function":"`anonymous namespace\'::ThreadFunc(void *)"

The backslash doesn't actually seem to be necessary here. I'll see if there's a way to coerce jsoncpp to not produce it.

Comment 3

[(not currently active) Ted Mielczarek]

I can't reproduce this with my local copy of stackwalker, it just spits out:
"function":"`anonymous namespace'::ThreadFunc(void *)"

There isn't anything mangling the output in between, right? If you run stackwalker on this dump (with the symbols present) and pipe it to a file does it produce the output with the extraneous quote?

Comment 4

[K Lars Lohn [:lars] [:klohn]]

You are correct - I found an obscure place where output from the stackwalk subprocess is being run through 'repr' one line at a time before being given to the processor.  I'm now trying to determine why it was put there before I strip it out.