1287916 - [e10s-multi] Semi-frequent lockups when using multiple content processes

Status: RESOLVED WORKSFORME

(Core :: DOM: Content Processes, defect)

Description

[Ryan VanderMeulen [:RyanVM]]

I've tried enabling multiple content processes a couple times now. Currently, I'm attempting to use 5. With them enabled, I find that I hit on a fairly regular basis (at least a few times daily) a full lockup where even the mouse stops moving. After about a second, things continue on normally. If I'm typing, the last letter gets repeated a bunch of times during that period. Unfortunately, they happen seemingly at random, so I don't have good STR.

I'm on Windows 10 x64. I encountered these issues a few months ago when still building with MSVC2013 and continue to with 2015u3.

My mozconfig:
> mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir-fx-64
> mk_add_options AUTOCLOBBER=1
> ac_add_options --enable-application=browser
> ac_add_options --enable-official-branding
> export MOZILLA_OFFICIAL=1
> export MOZ_TELEMETRY_REPORTING=1
> ac_add_options --target=x86_64-pc-mingw32
> ac_add_options --host=x86_64-pc-mingw32
> ac_add_options --enable-optimize="-O2 -GL -arch:AVX2"
> 
> ac_add_options --enable-debug-symbols
> ac_add_options --disable-debug
> 
> ac_add_options --disable-accessibility
> ac_add_options --disable-crashreporter
> ac_add_options --disable-parental-controls
> ac_add_options --disable-safe-browsing
> ac_add_options --disable-tests
> ac_add_options --disable-updater
> ac_add_options --enable-jemalloc=4

I'm open to trying out different options if anybody has suggestions. IRC discussion said jemalloc4 was unlikely to be at fault, but I'll try building without it enabled and see what happens. It was also suggested to try different values of browser.sessionstore.interval to see if it helps.

Comment 1

[Gabor Krizsanits (INACTIVE)]

I haven't seen this one yet... I don't think the profiler add-on is ready for multiple content processes, I should look into that. But normally I would try to create a snapshot with it right after this happens, that should be able to tell where is the hang coming from.

I also wonder if it's plugin related, since Bill mentioned an issue that might come up with plugins in a multi process setup (something CPOW related)...

Comment 2

[Mike Conley (:mconley) (:⚙️)]

I remember smacleod experiencing this a few months back, so roping him in too.

Comment 3

[Steven MacLeod [:smacleod]]

(In reply to Mike Conley (:mconley) - (Needinfo me!) from comment #2)
> I remember smacleod experiencing this a few months back, so roping him in
> too.

My issue was slightly different, no browser hanging, just a large set of my tabs would crash (I'm assuming that were in the same content process), and then any tabs I restored (or new unrelated tabs I opened) would crash, until the browser was restarted. This seemed to happen more often when I would run another browser instance with a different profile.

Comment 4

[Mike Conley (:mconley) (:⚙️)]

Whoops, I misremembered the issue! Sorry for the noise - I'll obsolete these comments.

Comment 5

[Blake Kaplan (:mrbkap) (inactive)]

- until we get STR.

Comment 6

[Andrew McCreight [:mccr8]]

I'm going to assume Ryan would have complained more in the last 5 years if he was still regularly hitting this issue.