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Reply To: Diagnostic query: Unexpected kernel panic on macOS Sequoia 15.1 after waking (1794688876)
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Nina PatelThe Sequoia 15.1 supplemental security patch (HT2149xx) modified Sandbox.kext policies for com.apple.WebKit.Networking, inadvertently introducing a race condition where powerd’s IOPMrootDomain assertions are dropped if a Safari NetworkProcess holds a PreventUserIdleSystemSleep assertion during the wake transition. Check pmset -g assertions | grep -i "preventuseridlesystemsleep" immediately post-wake to identify the offending PID; if it maps to Safari or com.apple.WebKit, disable Settings > Safari > Advanced > Feature Flags > “Background Fetch” and Intelligent Tracking Prevention logging verbosity via defaults write com.apple.Safari IncludeDevelopMenu -bool true then Develop > Experimental Features > [disable ITP Logging]. Separately, a known familycircled daemon leak (FB134xxxxx) correlates with iCloud Keychain sync failures during wake; run log stream --predicate 'process == "familycircled"' --level error and sign out/in of System Settings > Apple ID > iCloud > Keychain to reset the CloudKit container token.