1893817 - [macOS] Hangs on Startup After Profile Restore in AppWindow::ShowModal()

Status: UNCONFIRMED

(Core :: Widget: Cocoa, defect, P3)

Description

[03_yardage.type]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15

Steps to reproduce:

Restored backup of profiles (from previous Firefox versions).

Actual results:

Upon starting Firefox, the browser will appear in the dock and spike to 100% CPU usage and hang. It will need to then be force quit. No window will appear.

Expected results:

Firefox should have opened and displayed a window.

Comment 1

[03_yardage.type]

Attachment: Crash Report

Comment 2

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Cocoa' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

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

The severity field is not set for this bug.
:spohl, could you have a look please?

For more information, please visit BugBot documentation.

Comment 4

[Haik Aftandilian [:haik]]

The sample included by the reporter shows the main thread in mozilla::AppWindow::ShowModal() for the complete sample period 1.9 seconds (total hang is listed as ~300 seconds).

@Emilio, could this be related to any of the xpfe/appshell/AppWindow.cpp changes that went into 127? Possibly any that got backed out?

Comment 5

[Emilio Cobos Álvarez (:emilio)]

Rather unlikely, since those were win only. This smells a lot like bug 1881536 and relevant saga, do you agree? It seems it might be an exact duplicate of that one in fact, or adjacent at least.

Comment 6

[Haik Aftandilian [:haik]]

Thanks, they might end up having the same root cause, but let's keep this open until we have more information. This bug is described as opening an older profiler with a new version of Firefox (127 Nightly is listed in the sample log) and bug 1881536 is the reverse where we're opening a newer profile in an older version of Firefox.