100% CPU Usage of Userscripts-Mac-Safari-Extension even with no Safari windows open

[MikeRich88]

No Safari windows/tabs were open at all. (Maybe there was still a service worker running?)

Next time it does this, I'll run a sample to try and see what it's doing.

I have ~20 scripts but only 5 are even enabled, and all of those are targeting specific websites.

Version 4.6.0 (98) from TestFlight, but apparently this is old. Now updated to Version 5.0.0 (108). Safari v18.0.

This issue has been going on for a while.

[MikeRich88]

There's a report in Console, I forgot the system will run these automatically.

Userscripts-Mac-Safari-Extension_2024-09-26-193700_QuinnHex.cpu_resource.diag.zip

[ACTCD]

This shouldn't happen, the extension process is started by Safari, not our App.

So if you are not running Safari, the extension process should not exist.

You can check who started it.

One possible reason is that in Safari 18:

• Web apps on Mac with Safari Web Extensions (Safari 18) #719

[ACTCD]

There's a report in Console, I forgot the system will run these automatically.
Userscripts-Mac-Safari-Extension_2024-09-26-193700_QuinnHex.cpu_resource.diag.zip

@MikeRich88 I'm not an expert in analyzing log reports.

According to the log file you provided, it seems that the problem mainly points to the system Foundation framework.

This is the log symbolized based on the Userscripts_mac_v4.6.0(98).app.dSYM file of the corresponding version:
Userscripts-Mac-Safari-Extension_2024-09-26-193700_QuinnHex.cpu_resource.diag.symbol.txt

This appears to be consistent with a potential crash issue we recently fixed:

• fix: avoid two potential thread crashes #714
• fix: further avoid potential thread crashes #724

We didn't know it would also cause energy consumption issues.

Hopefully recent fixes will fix it in the meantime.

So please check if the same situation still exists in the latest version.