Outage in Circle CI
Build failures Xcode 26.4.0
Resolved MinorIncident Report
Summary AI Generated
Circle CI experienced build failures affecting macOS jobs using Xcode 26.4.0 on m4pro.medium and m4pro.large resource classes, with jobs being rejected due to an invalid resource class configuration error. The incident lasted 1.2 hours and was resolved by implementing a fix to restore normal job execution. Customers were advised to rerun any jobs that failed during the outage period.
There are build failures for Xcode 26.4.0; we have identified the issue and are currently implementing a fix.
Components affected
Circle CI macOS JobsTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
about 18 hours ago - at 04/24/2026 06:36PM
Customers running macOS jobs on m4pro.medium and m4pro.large with the xcode:26.4.0 image experienced job rejections with the error: "Job was rejected because resource class , image xcode:26.4.0 is not a valid resource class". The issue has been resolved and affected jobs should now run normally.
Customers whose jobs failed may rerun affected jobs.
We thank you for your patience while our team worked on implementing a fix.
MONITORING
about 19 hours ago - at 04/24/2026 06:01PM
A fix has been implemented and we are monitoring the results.
IDENTIFIED
about 19 hours ago - at 04/24/2026 05:25PM
There are build failures for Xcode 26.4.0; we have identified the issue and are currently implementing a fix.
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