1741444 - Random hangs since upgrade to 94

Status: RESOLVED DUPLICATE of bug 1735905

(Firefox :: Untriaged, defect)

Description

[Paul Menzel]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0

Steps to reproduce:

We build Mozilla Firefox ourselves with

mee_configure() {

    . /usr/local/package/lib/node.profile
    . /pkg/rustc-1.56.1-0/profile

    cat > ${S}/mozconfig <<-EOF
	ac_add_options --prefix=/usr
	ac_add_options --enable-application=browser
	ac_add_options --disable-necko-wifi
	ac_add_options --enable-official-branding
	ac_add_options --enable-system-pixman
	ac_add_options --without-system-icu
	ac_add_options --without-system-nspr
	ac_add_options --disable-tests
	ac_add_options --enable-optimize
	ac_add_options --disable-crashreporter
	ac_add_options --disable-updater
	mk_add_options MOZ_MAKE_FLAGS="${BEE_MAKEFLAGS}"
	mk_add_options MOZ_OBJDIR=$B
	EOF
    export MOZBUILD_STATE_PATH=${B}/mozbuild

}

and upgraded from 93.0 to 94.0 and also Rust from 1.52.1 to 1.56.1.

Actual results:

Users report random hangs. Especially having a USB camera connected and joining a Zoom meeting using the browser (the preview works), Firefox hangs and the spinner is shown.

Expected results:

It should work the same as with Firefox 93.0.

The Nightly 96.0a1 (20211116093425) does not show that behavior, but seems to be built differently.

Comment 1

[Paul Menzel]

Besides joining the Zoom meeting, the other random hangs cannot be reproduced.

Comment 2

[Paul Menzel]

Attachment: Output of `about:support`

Comment 3

[Paul Menzel]

Attachment: Output of `about:buildconfig`

Comment 4

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

The Bugbug bot thinks this bug should belong to the 'Firefox Build System::General' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Comment 5

[Paul Menzel]

Attachment: Compressed archive of output of `strace -ff -p 8389 -o /scratch/tmp/ff-strace.txt`

While Firefox was hanging (only window frames visible, inside was blank) I tried to trace the processes.

Comment 6

[Mitchell Hentges [:mhentges] 🦀]

Hmm, that's weird indeed.
I don't have any guesses as to the cause of the problem, but it would be very helpful if you could bisect to the change that's causing the issue.

Bumping back to untriaged because I doubt this is a build issue.

Comment 7

[Andrei Purice]

Hey Paul,
I tried to reproduce this issue on the latest versions of Firefox Nightly 96.0a1 (2021-11-18), beta 95.0b8 and release 94.0.1 on Ubuntu 20.04 but didn't encounter any issues.

Can you test the issue while in Safe Mode? You can find helpful info here : https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode .
Also a fresh new profile could help. You can find more about creating a new profile here : https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems#w_6-create-a-new-firefox-profile .

Comment 8

[Paul Menzel]

It’s bug 1735905, so no idea, how you can extend your setup to reproduce it in the future.