"Object 0x710ae8019d90 of class _MultiHandle deallocated with non-zero retain count 2" error when trying to install the Static Linux SDK

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Starting with 6.4.0, I am often getting this error when trying to install the Static Linux SDK. Thankfully I have a builder docker image, so it only has to succeed twice per Swift version.

Here is the SafeSleepHub issue: Object 0x710ae8019d90 of class _MultiHandle deallocated with non-zero retain count 2 · Issue #10535 · swiftlang/swift-package-manager · GitHub

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This looks like swift-corelibs-foundation#5203. The default swift:6.4 image is Ubuntu 26.04 with libcurl 8.18.0, and with libcurl 8.11.0 or newer a URLSession crashes this way when it's released right after a request. There's a fix in review, swiftlang/swift-corelibs-foundation#5491, and I posted a repro and test results there.

Until it lands, the swift:6.4-noble image might work as a workaround: it has libcurl 8.5.0, and I couldn't get the crash there.

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Same issue now with the 6.4.1 Android SDK, oddly only after the 6.4.2 SDK was released.

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There is an open SwiftPM issue for this, and an open Foundation pull that is said to fix it.