1429424 - Rule view is sometimes empty after a hard refresh

Status: RESOLVED DUPLICATE of bug 1429254

(DevTools :: Inspector: Rules, defect, P1)

Description

[Nicolas Chevobbe [:nchevobbe]]

Steps to reproduce:
1. Go to https://www.lullabot.com/articles/git-best-practices-workflow-guidelines
2. Right click on the title of the article and select "inspect element"
3. Wait until the markup and the rules are shown
4. Hard refresh (Ctrl + F5 on windows, Shift + Cmd + r on OSX) a few time

Expected results:

I always see the rules of the title on the rule view

Actual results:

Once in a while, the rule view gets empty, and the following message is logged in the browser console : 
TypeError: can't access dead object | devtools/server/actors/tab.js:1647:1

I couldn't reproduce with a simpler markup, so maybe there's a race issue with stylesheet load.

Comment 1

[Julian Descottes [:jdescottes]]

I get it 100% of the time with https://bugzilla.mozilla.org/buglist.cgi?bug_id=1405254%2C1404849%2C1404384%2C1405333%2C1408937%2C1408936%2C1408938%2C1405350%2C1405650%2C1405649%2C1405637%2C1405245%2C1406060%2C1408931%2C1403448%2C1405352%2C1405647%2C1405648%2C1405252%2C1403907%2C1408948%2C1404378%2C1403188%2C1403902%2C1408947%2C1401953%2C1404832%2C1408949%2C1408893%2C1404382%2C1406028%2C1405343%2C1404886%2C1408939%2C1403454%2C1404831%2C1404888%2C1403200%2C1408932%2C1404851%2C1408933%2C1405641%2C1408935%2C1401944%2C1403450%2C1406039%2C1401942%2C1403205%2C1408925%2C1401959%2C1405250%2C1408950%2C1405636%2C1404359%2C1406841%2C1406022%2C1408934%2C1404844%2C1404364%2C1404392%2C1408940%2C1401963%2C1404371%2C1401548%2C1405243%2C1404877%2C1408930%2C1408943%2C1404368%2C1405340%2C1408944%2C1405341%2C1404883%2C1408946%2C1408945%2C1403196%2C1408942%2C1404884%2C1408941%2C1406038%2C1404853&bug_id_type=anyexact&bug_status=UNCONFIRMED&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&list_id=13960343

Currently bisecting

Comment 2

[Patrick Brosset <:pbro>]

Couldn't reproduce so far, but that's a P1 for sure.
Also reported here (in French): https://twitter.com/Wadj0s/status/951087313479749633
It looks like this is a Nightly 59 only issue.

Let's make sure we get the fix in 59 too.

[Tracking Requested - why for this release]:
This sometimes prevents users from using the inspector, which is the most popular panel in DevTools.

Comment 3

[Julian Descottes [:jdescottes]]

Regression from Bug 1306892

Comment 4

[Julian Descottes [:jdescottes]]

Sending over to :jryans as discussed on IRC #devtools

Comment 5

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

This has the same root cause as the style editor version in bug 1429254.  That bug has patches up for review, so most likely we'll have this fixed soon.

Comment 6

[Liz Henry (:lizzard) (relman/hg->git project)]

Fixed in 59 in the duplicate bug.