1625476 - plugin-container opens every font file

Status: UNCONFIRMED

(Core :: Graphics: Text, defect, P3)

Description

[leons]

Attachment: plugin-container.txt

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:75.0) Gecko/20100101 Firefox/75.0

Steps to reproduce:

My macOS Catalina 10.15.3 started giving me too many open files errors.

I checked and plugin-container had an order of magnitude more open files than any other container. ~2400 of them were font files.

Disabling all extensions and reducing plugins to just the default OpenH264 and Widevine did not noticeably reduce the number. Restarting Firefox did not noticeably reduce this number.

Actual results:

$ sudo lsof -n | cut -f1 -d' ' | uniq -c | sort -rn | head
3989 plugin-co
614 firefox
318 Spotlight
275 AppleUser
261 UserEvent
212 Cisco\x20
208 UserEvent
192 AppleSpel
191 iconservi
188 mds_store

$ sudo lsof -n | grep plugin-co | grep Fonts | wc -l
2425

List of all open plugin-container files is attached.

Expected results:

plugin-container should not keep font files open

Comment 1

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

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[Jamie Nicol [:jnicol]]

Thanks for the report! Could you please attach your about:support information.

Does this occur every time you open firefox? Did it only start to happen recently? If you could reproduce whilst running (mozregression)[https://mozilla.github.io/mozregression/quickstart.html] that would really help us narrow down what's causing this.

Lee, could this be related to bug 1611467?

Comment 3

[Jonathan Kew [:jfkthame]]

I don't believe this is a recent regression, or related to bug 1611467 at all; the issue is that during initialization we instantiate a CGFont for each available font (in order to load style properties etc from the font file), and that causes CoreGraphics to open the file; and once it's open, it stays open for the lifetime of the process.

However, I haven't run into "too many open files" errors at all, despite having a similarly-large number of font files held open, so I wonder why that is?

Comment 4

[Jonathan Kew [:jfkthame]]

So one potential issue here would be that MacOSFontEntry will create its CGFont reference as soon as we call HasFontTable or GetFontTable on the entry, which we do for every face as part of checking for variation font attributes, for example. So we end up holding a live CGFont for every installed font face, even if most of them are never used.

However, I've been experimenting with a patch to fix this, by making these methods use a transient CGFont and only creating a long-lived instance if we actually use the font, not just collect its metadata for our font list. But according to lsof, this doesn't seem to help. It looks like even if I release the CGFont, CoreGraphics is keeping the underlying file open as soon as it has been used at all.

Comment 5

[leons]

Attachment: about-support.txt

Comment 6

[leons]

I've established that the too many open files error on my system was unrelated to Firefox, so CoreGraphics keeping fonts open is not creating other issues for me. I have no objections to resolving the issue as Invalid if that's appropriate.

Comment 7

[Firefox Bug Husbandry Bot]

Because this bug's Severity has not been changed from the default since it was filed, and it's Priority is P3 (Backlog,) indicating it has been triaged, the bug's Severity is being updated to S3 (normal.)

Comment 8

[benjishults]

I'm seeing plugin-container with 3193 open files just after restarting Firefox on macOS Catalina 10.15.2. Is that more than expected?

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"AzureFallbackCanvasBackend": "none",
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"ApzKeyboardInput": 1,
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{
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"status": "available"
},
{
"type": "user",
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}
]
},
{
"name": "OPENGL_COMPOSITING",
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}
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},
{
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},
{
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}
]
},
{
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},
{
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}
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},
{
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}
]
},
{
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}
]
},
{
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{
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},
{
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},
{
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}
]
}
],
"fallbacks": []
},
"crashGuards": []
},
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[
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],
[
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[
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[
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[
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],
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},
{
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{
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},
{
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},
{
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},
{
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}
]
}