NEW 206470
STP regularly gets to 100% CPU even when all tabs closed 
https://bugs.webkit.org/show_bug.cgi?id=206470
Summary STP regularly gets to 100% CPU even when all tabs closed
Nigel Jones
Reported 2020-01-18 03:25:27 PST
Created attachment 388142 [details] 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.
Attachments
process sample (139.72 KB, text/plain)
2020-01-18 03:25 PST, Nigel Jones 		no flags
Details
spindump (4.28 MB, text/plain)
2020-01-18 03:26 PST, Nigel Jones 		no flags
Details
process listing (226.42 KB, image/png)
2020-01-18 03:27 PST, Nigel Jones 		no flags
Details
image of browser - showing just a few tabs (226.85 KB, image/png)
2020-01-18 03:27 PST, Nigel Jones 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Nigel Jones
Comment 1 2020-01-18 03:26:05 PST
Created attachment 388143 [details] spindump
Nigel Jones
Comment 2 2020-01-18 03:27:08 PST
Created attachment 388144 [details] process listing
Nigel Jones
Comment 3 2020-01-18 03:27:32 PST
Created attachment 388145 [details] image of browser - showing just a few tabs
Nigel Jones
Comment 4 2020-01-18 03:28:54 PST
Closing all tabs except this one - no change
Nigel Jones
Comment 5 2020-01-18 03:30:16 PST
Closed all tabs - problem remained. Exited process, relaunched STP, and CPU useage back to normal
Alexey Proskuryakov
Comment 6 2020-01-18 23:14:18 PST
Sample and spindump implicate RemoteWebInspector.
Radar WebKit Bug Importer
Comment 7 2020-01-18 23:14:36 PST
<rdar://problem/58717053>
Blaze Burg
Comment 8 2020-04-21 15:52:05 PDT
Nigel, we haven't seen many reports of this. Have you encountered it recently with newer STP? If so, please file a report at https://feedbackassistant.apple.com and include a sysdiagnose so I can see webinspectord logs around when the spin starts. Please post the feedback ID here so I can correlate. Thanks!
Nigel Jones
Comment 9 2020-04-22 00:24:09 PDT
I have not seen this in the last 2 months... will open again if I do see issues, suggest closed now
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