1663734 - Crash in [@ mozilla::ipc::FatalError | mozilla::dom::PContentParent::OnMessageReceived] with: Error deserializing 'PBrowser'

Status: RESOLVED WORKSFORME

(Core :: DOM: Content Processes, defect, P3)

Description

[Rob Wu [:robwu]]

Crash report: https://crash-stats.mozilla.org/report/index/e350a8c2-10c8-496f-8d6c-404e30200908

Top 3 frames of crashing thread:

0 XUL mozilla::ipc::FatalError ipc/glue/ProtocolUtils.cpp:188
1 XUL mozilla::dom::PContentParent::OnMessageReceived ipc/ipdl/PContentParent.cpp:12522
2 Foundation GCC_except_table6 

Starting from Firefox 80.0, this crash is triggered with IPCFatalErrorMsg set to Error deserializing 'PBrowser' (you can see this field under the metadata tab of a crash report): link to all crash reports with the IPCFatalErrorMsg column shown (note that it started with Firefox 80.*, and there is also a 81.0 beta among the reports).

When I search for Error deserializing 'PBrowser and limit the results to PContentParent, then there are three results:

• PContent::Msg_PWebBrowserPersistDocumentConstructor__ID (unlikely - see below)
• PContent::Msg_CreateWindow__ID
• PContent::Msg_CreateWindowInDifferentProcess__ID

According to the reported (who I am in contact with), the crash happened when they clicked on a button in a moz-extension: document (tab), which in turn tried to open a new tab. So I think that the crash is triggered via CreateWindow or CreateWindowInDifferentProcess.

Comment 1

[Rob Wu [:robwu]]

Nika, I saw that you've recently made some changes in the aThisTab parameter of CreateWindow in bug 1639367, which might be related to this crash.

Could you take a look at this crash report to see if anything stands out?

Comment 2

[Chris Peterson [:cpeterson]]

S3 because the crash volume is low for now.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Closing because no crashes reported for 12 weeks.