Open Bug 1501281 Opened 7 years ago Updated 1 year ago

Firefox Freezes Computer

Categories

(Core :: Graphics, defect, P3)

Product:
Core
Component:
Graphics
Version:
63 Branch
Type:
defect

Tracking

()

Project Flags:
Performance Impact none

People

(Reporter: sdaswani, Unassigned)

Details

In the course of using Firefox, my whole Windows 10 system will freeze for several minutes, and then will unfreeze some minutes later. I am not doing anything in particular for this to occur but it happens regularly (e.g., every time firefox is restarted).
Firefox could only allocate all available memory to make the system slow but nothing much else. Are you sure that this is not a hardware problem with your system ?
Product: Firefox → Core
Unfortunately there's not much we can go on here. Can you attach the contents of about:support, Susheel? Bas, do we have any suggestions for diagnosing such whole system freezes?
Flags: needinfo?(sdaswani)
Flags: needinfo?(bas)
It could be a hardware problem. It's more pronounced on my laptop than on the beefier desktop, but it happens for a few second on the desktop too. I will attach the about:support contents soon.
So as I was getting the requested data, it just happened. State of my computer: 1) Computer had been sleeping, with power plugged in. 2) Woke it up. 3) WhatsApped a bit. 4) Opened Firefox (which had been minimized). 5) Went to gmail and clicked on this bugzilla (an overdue NI). 6) While mousing on this bug the computer froze for 8 seconds. about:support below { "application": { "name": "Firefox", "osVersion": "Windows_NT 10.0", "version": "63.0", "buildID": "20181018182531", "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0", "safeMode": false, "updateChannel": "beta", "supportURL": "https://support.mozilla.org/1/firefox/63.0/WINNT/en-US/", "numTotalWindows": 1, "numRemoteWindows": 1, "remoteAutoStart": true, "currentContentProcesses": 5, "maxContentProcesses": 4, "autoStartStatus": 1, "policiesStatus": 0, "keyGoogleFound": true, "keyMozillaFound": true }, "securitySoftware": { "registeredAntiVirus": "Windows Defender Antivirus", "registeredAntiSpyware": "Windows Defender Antivirus", 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Flags: needinfo?(sdaswani)
Then when 'Saving Changes' my computer froze again, but this time it told me (in the toolbar of FF) that Firefox was not responding.
(In reply to Andrew Overholt [:overholt] from comment #2) > Unfortunately there's not much we can go on here. Can you attach the > contents of about:support, Susheel? > > Bas, do we have any suggestions for diagnosing such whole system freezes? This is a really complicated question. I know Microsoft gathers data/telemetry on these types of things, but I doubt any individual cases of that are helpful. Our background hang reports -could- contain information on this, but it's of course also possible that something about the system's UI is frozen but background processes are happily continuing to do work, in which case BHR wouldn't notice anything.
Flags: needinfo?(bas)
Can you install the profiler (http://perf-html.io/) and have it running and then capture it when the computer unfreezes?
Flags: needinfo?(sdaswani)
Hi there. I have the same problem since some days, that my PC freezes while Firefox is in focus. It seams to happen only after awakening the system from hibernation. For me it never unfreezes. I have to hard-reset my computer. Once i got a BSOD after some tens of seconds (dpc watchdog violation - ntoskrnl.exe). I checked my memory and hard discs for errors but found nothing.
Hi again. I cant tell for sure, since i not tested this for long now, but it seams that closing firefox before going into hibernation is a suitable work-around for this problem for me. And since i forgot to metion in my last post: Firefox Version is 63.0.1 Windows Version is 1803 (10 Pro)
I ack the NI, will respond more soon.
I have the profiler installed and recording, just waiting to hit the next hang.
Flags: needinfo?(sdaswani)
Keeping NI so I don't forget this.
Flags: needinfo?(sdaswani)
Ugh my computer froze the other day but the profiler wasn't running. Please stay tuned, I need to get lucky here.
Andrew, I ended up catching this issue while running the profiler, and I believe I saved the profile locally, but I can't find it! I searched on where the saved profile was stored but I can't find out where it is stored. Do you know?
Flags: needinfo?(sdaswani) → needinfo?(overholt)
Good question and I don't know! Greg or Julien will, though.
Flags: needinfo?(overholt)
Flags: needinfo?(gtatum)
Flags: needinfo?(felash)
If you saved the profile locally it should be where you save the other files. Don't you see it in the Downloads panel (you should be able to open it from the Tools menu)? If you didn't save the profile, then there's nothing you can do to get it back, we don't auto-save. And... I get issues similar to this bug for a few days too.
Flags: needinfo?(felash)
If you mistakenly uploaded it instead of downloading it, the profile might be in your browser history. Search your history for: "perf-html.io/public"
Flags: needinfo?(gtatum)
Back to Susheel to be sure he knows how to upload any profile he has saved locally.
Flags: needinfo?(sdaswani)

Nope, this profile seems to have disappeared. Back on me to try to get another profile. :/

Great news - I opened up FF afresh this evening, opened gmail, open bugzilla, and then I encountered the freeze, and this time I have the profile!

See a screenshot and a gz of the profile here: https://drive.google.com/file/d/1Cabps0pKlOhFfHo232JE7DShzhDdeUMW/view?usp=sharing
https://drive.google.com/file/d/1rmE8Q2bAVLLwA8c5peuT_l_lfqEiXdPo/view?usp=sharing

Flags: needinfo?(sdaswani)

I see the main process is waiting for something from the APZ thread (or process), see also the marker "PAPZInputBridge::Msg_ReceiveKeyboardInputEvent".

Can we profile the APZ thread somehow?

Thanks, Susheel!

Maybe kats has thoughts on comment 21.

Flags: needinfo?(kats)
Whiteboard: [qf]

I put the profile here for easier access: https://perfht.ml/2VLTChM

The main thread is indeed stuck in PAPZInputBridge::Msg_ReceiveKeyboardInputEvent for ~50 seconds, preceded by a ~10s block in FlushRendering. Both of these attempt to talk to the GPU process, and in the profile it looks like GPU process threads only start after the big hang. (Although technically the APZ message goes to the main thread in the GPU process, which isn't included in the profile).

As a first guess there might be a GPU process restart happening here, and the profile is only picking up stuff from the "new" GPU process and throwing away the old stuff. Markus, do you know if that's what happens if you are collecting a profile across a GPU process reset?

At any rate, the hang ends once the new GPU process is up, so the more interesting question is what happens in the "old" GPU process, and what triggers that, but I don't think we can answer that from this profile.

It would also be useful to look at about:support after one of these hangs and see if there are any useful error messages reported in the graphics section.

Flags: needinfo?(kats) → needinfo?(mstange)

As a first guess there might be a GPU process restart happening here, and the profile is only picking up stuff from the "new" GPU process and throwing away the old stuff. Markus, do you know if that's what happens if you are collecting a profile across a GPU process reset?

We only get the profile from a GPU process that's shutting down if it shuts down regularly and has a chance to report its shutdown profile. However, if the GPU process crashes, the profile information from it is lost.

Maybe there's a crash report on about:crashes for the GPU process crash? It might help.

Flags: needinfo?(mstange)

This sounds like a GPU process misbehaviour and then crash, so moving to the Graphics component. Our responsiveness is poor, but I suspect we should probably try to avoid the misbehaviour and crash rather than trying to make our reaction to this misbehaviour better. So marking qf- for now.

Component: General → Graphics
Whiteboard: [qf] → [qf-]
Priority: -- → P3
Performance Impact: --- → -
Whiteboard: [qf-]
Severity: normal → S3
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