Bug 325090

Summary: REGRESSION(313673@main): Stuck or hung WebProcess can indefinitely block the WebProcess from exiting
Product: WebKit Reporter: Jeff Johnson <opendarwin>
Component: WebKit2Assignee: Ben Nham <nham>
Status: RESOLVED FIXED    
Severity: Normal CC: ap, cdumez, kkinnunen, nham, rreno, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: Safari 27   
Hardware: Mac (Apple Silicon)   
OS: macOS 15   
Attachments:
Description Flags
Spindump of Safari Web Content process none

Jeff Johnson
Reported 2026-09-23 18:45:24 PDT
Created attachment 481533 [details] Spindump of Safari Web Content process Safari 27.0 on macOS 15.8 All Safari windows were closed, and Safari was in the background, but I noticed that my MacBook Pro was a little warm, so I opened Activity Monitor and found that the Safari Web Content process was using >100% CPU. Attached is a spindump. As far as I can tell, the issue appears to be JS GC. But I don't know why that continues to occur after all Safari windows are closed.
Attachments
Spindump of Safari Web Content process (362.82 KB, text/plain)
2026-09-23 18:45 PDT, Jeff Johnson 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2026-09-23 22:34:19 PDT
Yes, I think that the root cause is that it was allowed to keep running somehow. This is probably a case that's not actionable without at least the system log, if not a full sysdiagnose.
Ben Nham
Comment 2 2026-09-27 17:34:51 PDT
rdar://188410300
Ben Nham
Comment 3 2026-09-27 17:46:58 PDT
Pull request: https://github.com/WebKit/WebKit/pull/75086
EWS
Comment 4 2026-09-27 21:50:12 PDT
Committed 322030@main (3aaae9b46e75): <https://commits.webkit.org/322030@main> Reviewed commits have been landed. Closing PR #75086 and removing active labels.
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