1724682 - [Widevine] DRM_NO_KEY_SYSTEM when building with mingw-w64

Status: UNCONFIRMED

(Core :: Audio/Video: Playback, defect, P3)

Description

[Alex Kontos]

Attachment: console.log

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Firefox/91.0 Waterfox/91.0a1

Steps to reproduce:

Built Firefox with mingw-w64. Since GMP recognises the system type as WINNT_x86_64-gcc3-x64, I added the following to widevincdm.json to make sure it would download/install the plugin:

"WINNT_x86_64-gcc3-x64": {
          "alias": "WINNT_x86_64-msvc"
        }

Actual results:

When attempting to load a video that requires DRM, widevine fails to load.

Expected results:

DRM enabled video should play.

Comment 1

[Alex Kontos]

Attachment: gmplog.moz_log

Comment 2

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

It looks like the GMP process is failing to load

D/GMP GMPServiceChild failed to launch GMP with error: NS_ERROR_FAILURE (0x80004005) - GeckoMediaPluginServiceChild::GetContentParent SendLaunchGMPForNodeId failed with description (Process has not loaded.)

and

D/GMP GMPParent[1d7bfe3a000|childPid=0] LoadProcess: Failed to launch new child process

Comment 3

[Alex Kontos]

Anything I can do to help debug this more?

Comment 4

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Sure! It will involve debugging why the process is failing to start.

• It's this code that is failing.
• The code is calling into this code, which looks like it's failing.

You've got a couple of options to debug this.

• Try running firefox with the env var MOZ_DISABLE_GMP_SANDBOX=1 set. This will disabled the GMP sandbox and let us know if the problem is GMP sandbox related.
• If that doesn't help, debugging the code above. You could use a debugger to see what's going on, or you could add extra logging to try and narrow down where the Launch code is failing. I think it's likely that the failure is happening in further calls starting here, so it may require some drilling down.

Comment 5

[Alex Kontos]

Running with MOZ_DISABLE_GMP_SANDBOX=1 works 👍. Any info from logs or related that may be of use?

Comment 6

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Thanks for checking that! Could you try running with the sandbox on and logging on to see if you get any logs indicating what the sandbox is dying on?

Comment 7

[Alex Kontos]

Attachment: sandbox.log

Here's the log output from the browser console when using `MOZ_SANDBOX_LOGGING=1`:

```log

Comment 8

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Thanks. I don't know if I'll have cycles to look at this immediately. NI myself to have a look when I get a moment.

Comment 9

[Alex Kontos]

Attachment: sandbox.log

Output from the browser console when using MOZ_SANDBOX_LOGGING=1. It doesn't look verbose enough or outputting anything relevant - should I use any other prefs?

Comment 10

[Alex Kontos]

Sorry, don't know what's happened! Double posted :-)

Comment 11

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

There's certainly some sandbox logging in there. I don't know off the top of my head if any of the blocking happening is our culprit -- there's certainly some stuff being blocked.

Comment 12

[Alex Kontos]

Ah wasn’t sure if it was enough information to do anything with. Good to hear then, if there’s anything else I can help with let me know - not sure I have the expertise to debug and step through the GMP and sandboxing around it.

Comment 13

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

I'm thinking we may be able to debug further if I can look at the logs and Windows sandbox rules, and if we can find a rule that looks like it's clobbering your build based on the logs, we could try a build with that rule(s) disabled to figure this out. However, the sandbox isn't my primary domain of expertise, so I need some time to trawl the code.

Similarly I'm not sure if the above log contains all possible info. I'll let you know if I figure out if we can gather more.

Comment 14

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Passing NI.