[Webkit-unassigned] [Bug 206470] New: STP regularly gets to 100% CPU even when all tabs closed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206470

            Bug ID: 206470
           Summary: STP regularly gets to 100% CPU even when all tabs
                    closed
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nigel at cherrybyte.me.uk

Created attachment 388142

  --> https://bugs.webkit.org/attachment.cgi?id=388142&action=review

process sample

Every few days I notice STP spinning a core, ie taking 100% CPU. This is not in the process listing as a 'page', but just 'Safari Technology Preview' - ie the main process. It occurs about once or twice a week. I use STP almost exclusively for my web browsing.

I'm using STP 98 on MacOS 10.15.3 Beta (19D62e) - though I've seen the same behaviour for a month or so.

I will attach a spindump and sample - since from a user's perspective I have no idea of what may be causing this - a particular site, plugin or similar. Maybe synchronization.

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