1317950 - Regression: Firefox occassionally hangs when attempting to load up an asm.js page, and no slow script dialog is shown

Status: RESOLVED INCOMPLETE

(Firefox :: Untriaged, defect)

Description

[Jukka Jylänki]

STR:

1. Repeatedly visit https://s3.amazonaws.com/mozilla-games/tmp/2016-05-05-PlatformerGame-profiling/PlatformerGame-HTML5-Shipping.html?playback&cpuprofiler&webglprofiler&expandhelp&tracegl=50&novsync

Observed:

Every one in a while, Firefox hangs when the page is loading up, with the page spinner "Compiling" stuck on the screen. Right-clicking on the page does not bring up the context menu, and choosing Options->Developer Console->Web Console opens up an empty window that doesn't show any content. Typing any other web address to the navigation bar to navigate away from the page doesn't work either, the browser is just stuck on that page.

I'm not sure if this is a JS engine bug, or a graphics bug, or where the issue is. Looking at Windows process explorer, both Firefox Nightly processes are idle at 0% of CPU usage, so it's not at least livelocked spinning on doing something.

This has begun to occur about a week ago or so.

Comment 1

[Jukka Jylänki]

Attachment: firefox_hung.jpg

Comment 2

[Luke Wagner [:luke]]

Could you perhaps get a callstack for all the threads.  Hang + 0% CPU sounds like the main thread might've gotten stuck waiting on a lock or condvar so the stack could point a finger.

Comment 3

[Hani Yacoub, Desktop QA]

I tried to provide with the regression window wanted but I couldn't reproduce this issue, tested on Windows 7 64 bit using Firefox 50 Release nor on Firefox Nightly 53.0a1.

Jukka, considering the issue is reproducible on your end could you please try to narrow down the regression window for this particular issue?
http://mozilla.github.io/mozregression/

Comment 4

[Hani Yacoub, Desktop QA]

Closing as Resolved:Incomplete due to no update from reporter. Please feel free to reopen the bug if issue still exists for you even with fresh profile and safe mode.