[6.1] Frequent crashes in LLBuildProgressTracker while building swift-java on linux and swift 6.1.2 #9019
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…on linux and swift 6.1.2 (swiftlang#8998) Frequent crashes in LLBuildProgressTracker while building swift-java on linux and swift 6.1.2 > Thread 4 crashed: > > 0 0x00007f1559da359a swift_slowAlloc + 74 in [libswiftCore.so](http://libswiftcore.so/) > 1 [ra] 0x00007f1559da3877 swift_allocObject + 38 in [libswiftCore.so](http://libswiftcore.so/) > 2 [ra] 0x00007f1559b85571 _allocateStringStorage(codeUnitCapacity:) + 160 in [libswiftCore.so](http://libswiftcore.so/) > 3 [ra] 0x00007f1559d03452 _StringGuts.grow(_:) + 273 in [libswiftCore.so](http://libswiftcore.so/) > 4 [ra] 0x00007f1559bf7e88 specialized static String._fromUTF8Repairing(_:) + 999 in [libswiftCore.so](http://libswiftcore.so/) > 5 [ra] [inlined] [system] 0x000056315a96e7ef specialized String.init<A, B>(decoding:as:) in swift-package at //<compiler-generated> > 6 [ra] [inlined] 0x000056315a96e7ef stringFromData(_:) in swift-package at /home/build-user/llbuild/products/llbuildSwift/Internals.swift:49:12 > 7 [ra] 0x000056315a96e7ef Command.name.getter + 78 in swift-package at /home/build-user/llbuild/products/llbuildSwift/BuildSystemBindings.swift:720:20 > 8 [ra] 0x00005631593a61a2 closure swiftlang#1 in LLBuildProgressTracker.commandProcessFinished(_:process:result:) + 33 in swift-package at /home/build-user/swiftpm/Sources/Build/LLBuildProgressTracker.swift:347:65 > 9 [ra] [thunk] 0x00005631592f6989 thunk for @escaping @callee_guaranteed @sendable () -> () + 24 in swift-package at //<compiler-generated> Command is associated with a handle (pointer) that may be reclaimed when this function finishes. Do not access command attributes asynchronously (cherry picked from commit 16452e1)
rconnell9
requested review from
bnbarham,
MaxDesiatov,
jakepetroules,
francescomikulis,
xedin,
dschaefer2,
shawnhyam,
bripeticca,
plemarquand,
owenv and
bkhouri
as code owners
jakepetroules
approved these changes
Aug 13, 2025
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@swift-ci test |
bkhouri
changed the title
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Explanation:
(cherry picked from commit 16452e1)
Frequent crashes in LLBuildProgressTracker while building swift-java on linux and swift 6.1.2
Command is associated with a handle (pointer) that may be reclaimed when this function finishes.
Scope:
Minimal
Issues:
swiftlang/swift-java#314
Original PRs:
#8998
Risk:
Minimal. Change explicitly copies variables prior to usage in async block.
Change has been tested in main and 6.2
Testing:
Confirmed fixed in main and 6.2