ARV glitches: "Failed to save edit: Edit conflict detected"

[Amalthea]

From

• http://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Twinkle&oldid=433020512#ARV
• http://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Twinkle&oldid=433020512#Processing_AIV_request:_Failed_to_save_edit:_Edit_conflict_detected

UAA & AIV reports sometimes can't be saved due to an alleged edit conflict. It tries to save two or three times, and then gives up.
I could reproduce it once, but the problem dissolved while I was trying to debug it. It re-manifests from time to time though.

[azatoth]

Can you see if the server actually in it's reply indicate that it's an alleged edit conflict?

[Amalthea]

I only looked into it once and the issue disappeared before I could get anywhere, but at least the one time Walter Görlitz wrote that report the API must have actually reported an edit conflict: The section header he used, "Failed to save edit: Edit conflict detected", is assembled in morebits
ctx.statusElement.error( "Failed to save edit: " + ctx.saveApi.getErrorText() )
The error text "Edit conflict detected" is defined in ApiBase.php and returned by the api if it detected an edit conflict.

Since this problem is observable for minutes at a time, I'd suspect some cache or database lag issue here.

[atlight]

There seems to be a bug in the server API related to editing specific page sections. If the calls to setPageSection are removed, this error should go away.

[Amalthea]

synched, I'll tell folks to re-open if it still happens

[Amalthea]

If it /is/ fixed we may want to report this to bugzilla.wikimedia.org.