1446684 - Watched variables appear as "unavailable" when stopped at a breakpoint

Status: RESOLVED FIXED

(DevTools :: Debugger, defect)

Description

[[e-mail]]

Attachment: unavailable_bug2.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180313225158

Steps to reproduce:

1) Set a breakpoint on a given page (in TypeScript compiled js)
2) Add some watched local variables
3) Hit the breakpoint
4) Change the script on the server side
5) Re-freshed the page, hit the same breakpoint (the line number of the breakpoint hadn't changed because changes were in another file)


Actual results:

In the Watch Expressions panel, my variables appear as "unavailable" (see screenshot). However, I can see that the debugger has access to their values, as they appear in the Scopes panel.


Expected results:

I expect that if I can see the values in the Scopes panel I should be able to see them in the Watch Expressions panel as well. The Watch Expressions panel is way more convenient compared to digging through scopes.

I am attaching screenshots of the bug. Whenever I tried to add anther watched expression in the "Watch Expressions" panel, while in the error state, the following errors showed in the browser console:

Invalid chrome URI: /
[Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIInterfaceRequestor.getInterface]"  nsresult: "0x80004002 (NS_NOINTERFACE)"  location: "JS frame :: resource://gre/modules/LoginManagerContent.jsm :: messageManagerFromWindow :: line 158"  data: no]  (unknown)
	messageManagerFromWindow resource://gre/modules/LoginManagerContent.jsm:158:10
	_onFormSubmit resource://gre/modules/LoginManagerContent.jsm:939:26
	notify resource://gre/modules/LoginManagerContent.jsm:63:7
Invalid chrome URI: /
[Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIInterfaceRequestor.getInterface]"  nsresult: "0x80004002 (NS_NOINTERFACE)"  location: "JS frame :: resource://gre/modules/LoginManagerContent.jsm :: messageManagerFromWindow :: line 158"  data: no]  (unknown)
	messageManagerFromWindow resource://gre/modules/LoginManagerContent.jsm:158:10
	_onFormSubmit resource://gre/modules/LoginManagerContent.jsm:939:26
	notify resource://gre/modules/LoginManagerContent.jsm:63:7

Comment 1

[[e-mail]]

Also please note that I am not sure the "change script on the server side" step is neccessary to hit this. I can try and reproduce further.

Comment 2

[Jason Laster [:jlast]]

Hi dbounov, i believe these are fixed in nightly. Could you re-try?

Comment 3

[[e-mail]]

I have not observed this in nightly in several weeks. Thank you!