Note: There are a few cases of duplicates in user autocompletion which are being worked on.

stylo: Crash in nsIFrame::SetNextSibling

Assigned to



CSS Parsing and Computation
11 days ago
3 days ago


(Reporter: marcia, Assigned: heycam, NeedInfo)


(Blocks: 1 bug, {crash})

56 Branch
Windows 10

Firefox Tracking Flags

(firefox56 affected)


(crash signature)



11 days ago
This bug was filed from the Socorro interface and is 
report bp-a8141646-372b-40d9-84da-e6d630170710.

55 crashes/16 installs that have stylo enabled (at least the 6 reports I spot checked):

Not sure who to need info, is it bholley?
Blocks: 1375906
My guess is that the frame constructor somehow messes things up, and we end up violating this assertion:

Not sure what happens behind, though, since there is no reproducible steps...
Priority: -- → P1

Comment 2

7 days ago
I had this crash to twice in the last days.
I can only remember one crash partly and there the tab crashed in a JIRA Case ticket (e.g. I think I just tried to open or close an image, but I'm not sure.
I can trigger this bug by opening and closing popup image, and scrolling the page between. It result in page visual glitch and tab crashes soon after. It is quite rare, so it is hard to provide exact steps to reproduce.

But I also hit bug 1379218 crash while doing my test, so they might have the same cause.
I can hit this crash pretty often when editing the general review comment in mozreview.
Please note that there is also bug 1381475 which gets triggered by review comments in mozreview. Are both crashes somehow related?

Comment 6

4 days ago
I can trigger this bug easily with the following steps:

1. Go to and sign up for the Material design beta
2. Browse some videos, in a few minutes you will get a crash with this bug
Cameron volunteered to investigate this top crash.
Assignee: nobody → cam

Comment 8

4 days ago
(In reply to Grant from comment #6)
> 1. Go to and sign up for the Material
> design beta
> 2. Browse some videos, in a few minutes you will get a crash with this bug

Hi Grant, can you clarify the STR for me?  Do I need to click Sign Up, and go through the lengthy questionnaire where I provide Google with my details for their UX researches to contact me?  Or it it just the "Try new YouTube" button on that I need (which has a Material Design logo next to it)?
Flags: needinfo?(tenisthenewnine)
Comment hidden (typo)
Comment hidden (typo)

Comment 11

3 days ago
I haven't had any luck reproducing this so far, but I see that the aren't any reports of this crash on crash-stats after the 20170716030208 build.
I could assume that this is maybe overlayed by bug 1381475? If that assumption is true we should see the signature again very soon.

Comment 13

3 days ago
Yes, that might be it.  Let's see if it crops up again with today's nightly.
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