stylo: Crash in do_QueryFrame::operator<T> nsIAnonymousContentCreator*

RESOLVED FIXED in Firefox 56



a year ago
a year ago


(Reporter: marcia, Assigned: bholley)


(Blocks: 1 bug, {crash})

Windows 10

Firefox Tracking Flags

(firefox-esr52 unaffected, firefox54 unaffected, firefox55 unaffected, firefox56 fixed)


(crash signature)


(1 attachment)

This bug was filed from the Socorro interface and is 
report bp-88e599f9-e12a-4ba9-82d1-29b520170711.

Seen in crash stats:

Some URLs:
Blocks: 1375906

Comment 1

a year ago
So, I'm not really sure why do_QueryFrame is crashing, but given that this is during document teardown it seems possible that we may have destroyed the arena but not yet nulled out the element->frame pointer.

Either way, we call FragmentOrElement::DestroyContent, which calls nsBindingManager::RemovedFromDocumentInternal, which calls FragmentOrElement::SetXBLInsertionParent, which tries to recursively clear servo data from the subtree:

We really don't need to be doing that at all given that this is during teardown. So it might make sense to just clear the servo data at the top of FragmentOrElement::DestroyContent. I'll try.
Assignee: nobody → bobbyholley

Comment 2

a year ago
Created attachment 8885427 [details] [diff] [review]
Drop style data in DestroyContent. v1

MozReview-Commit-ID: 9ydkvlDA9oS
Attachment #8885427 - Flags: review?(cam)
Comment on attachment 8885427 [details] [diff] [review]
Drop style data in DestroyContent. v1

Review of attachment 8885427 [details] [diff] [review]:

I suppose this is OK, although I would prefer something less indirect, e.g. a check in FragmentOrElement::SetXBLInsertionParent that we're not in the middle of destroying the document (e.g. by checking nsDocument::mIsGoingAway, although that's not exposed).
Attachment #8885427 - Flags: review?(cam) → review+
Priority: -- → P1

Comment 5

a year ago
Boris was concerned as to why we'd be hitting this, and was going to try reproducing locally.
Flags: needinfo?(bzbarsky)
So I tried adding checks to FragmentOrElement::DestroyContent to yell if GetPrimaryFrame() is non-null.  It never is, for me, on the urls in comment 0, as expected.

I tried installing uBlock Origin (since the crash dump above seems to have it installed), but that does not seem to change things.  Not sure whether one of the other addons is relevant here...

Anyway, the change in this bug makes sense to me, I think, though I agree it fixing the bug is not quite obvious.
Flags: needinfo?(bzbarsky)

Comment 7

a year ago
Pushed by
Drop style data in DestroyContent. r=heycam,r=bz

Comment 8

a year ago
Last Resolved: a year ago
status-firefox56: affected → fixed
Resolution: --- → FIXED
Target Milestone: --- → mozilla56
status-firefox54: --- → unaffected
status-firefox55: --- → unaffected
status-firefox-esr52: --- → unaffected
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