[SR-12781] swift-nio-http2 crashes the compiler


Previous ID	SR-12781
Radar	rdar://problem/63083691
Original Reporter	@Lukasa
Type	Bug

Additional Detail from JIRA

| | | |------------------|-----------------| |Votes | 1 | |Component/s | Compiler | |Labels | Bug, Crash | |Assignee | None | |Priority | Medium | md5: a2ea3f233e63f63e9007b779340ddde4

Issue Description:

Building swift-nio-http2 from a development branch deterministically crashes the compiler. This works with the 5.3 nightly from the 4th of May.

Crash details:

Unhandled, unexpected instruction:   %7 = select_enum_addr %1 : $*Optional<(T1, T2)>, case #Optional.some!enumelt: %5, default %6 : $Builtin.Int1 // user: %8
invoking standard assertion failure
UNREACHABLE executed at /home/buildnode/jenkins/workspace/oss-swift-5.3-package-linux-ubuntu-18_04/swift/lib/SIL/Verifier/SILVerifier.cpp:639!
Stack dump:
0.  Program arguments: /usr/bin/swift -frontend -c /code/Tests/NIOHPACKTests/HPACKCodingTests+XCTest.swift /code/Tests/NIOHPACKTests/HPACKCodingTests.swift /code/Tests/NIOHPACKTests/HPACKIntegrationTests+XCTest.swift /code/Tests/NIOHPACKTests/HPACKIntegrationTests.swift /code/Tests/NIOHPACKTests/HPACKRegressionTests+XCTest.swift /code/Tests/NIOHPACKTests/HPACKRegressionTests.swift -primary-file /code/Tests/NIOHPACKTests/HeaderTableTests+XCTest.swift -primary-file /code/Tests/NIOHPACKTests/HeaderTableTests.swift -primary-file /code/Tests/NIOHPACKTests/HuffmanCodingTests+XCTest.swift /code/Tests/NIOHPACKTests/HuffmanCodingTests.swift /code/Tests/NIOHPACKTests/IntegerCodingTests+XCTest.swift /code/Tests/NIOHPACKTests/IntegerCodingTests.swift -emit-module-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest~partial.swiftmodule -emit-module-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests~partial.swiftmodule -emit-module-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest~partial.swiftmodule -emit-module-doc-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest~partial.swiftdoc -emit-module-doc-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests~partial.swiftdoc -emit-module-doc-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest~partial.swiftdoc -emit-module-source-info-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest~partial.swiftsourceinfo -emit-module-source-info-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests~partial.swiftsourceinfo -emit-module-source-info-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest~partial.swiftsourceinfo -emit-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest.d -emit-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests.d -emit-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest.d -emit-reference-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest.swiftdeps -emit-reference-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests.swiftdeps -emit-reference-dependencies-path /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest.swiftdeps -target x86_64-unknown-linux-gnu -disable-objc-interop -I /code/.build/x86_64-unknown-linux-gnu/debug -I /code/.build/checkouts/swift-nio/Sources/CNIOHTTPParser/include -I /code/.build/checkouts/swift-nio/Sources/CNIOSHA1/include -I /code/.build/checkouts/swift-nio/Sources/CNIOAtomics/include -I /code/.build/checkouts/swift-nio/Sources/CNIODarwin/include -I /code/.build/checkouts/swift-nio/Sources/CNIOLinux/include -enable-testing -g -module-cache-path /code/.build/x86_64-unknown-linux-gnu/debug/ModuleCache -warnings-as-errors -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -color-diagnostics -enable-anonymous-context-mangled-names -Xcc -fmodule-map-file=/code/.build/x86_64-unknown-linux-gnu/debug/CNIOHTTPParser.build/module.modulemap -Xcc -fmodule-map-file=/code/.build/x86_64-unknown-linux-gnu/debug/CNIOSHA1.build/module.modulemap -Xcc -fmodule-map-file=/code/.build/x86_64-unknown-linux-gnu/debug/CNIOAtomics.build/module.modulemap -Xcc -fmodule-map-file=/code/.build/x86_64-unknown-linux-gnu/debug/CNIODarwin.build/module.modulemap -Xcc -fmodule-map-file=/code/.build/x86_64-unknown-linux-gnu/debug/CNIOLinux.build/module.modulemap -parse-as-library -module-name NIOHPACKTests -o /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests+XCTest.swift.o -o /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HeaderTableTests.swift.o -o /code/.build/x86_64-unknown-linux-gnu/debug/NIOHPACKTests.build/HuffmanCodingTests+XCTest.swift.o -index-store-path /code/.build/x86_64-unknown-linux-gnu/debug/index/store -index-system-modules 
1.  Swift version 5.3-dev (LLVM 6855d3af88, Swift d33ecd327b)
2.  While evaluating request SILGenSourceFileRequest(SIL Generation for file "/code/Tests/NIOHPACKTests/HeaderTableTests.swift")
3.  While emitting SIL for 'XCTAssertEqualTuple(_:_:_:file:line:)' (at /code/Tests/NIOHPACKTests/HeaderTableTests.swift:19:1)
4.  While silgen emitFunction SIL function "@$s13NIOHPACKTests19XCTAssertEqualTuple___4file4lineyx_q_tSgyKXK_AEyKXKSSyXKs12StaticStringVSutSQRzSQR_r0_lF".
 for 'XCTAssertEqualTuple(_:_:_:file:line:)' (at /code/Tests/NIOHPACKTests/HeaderTableTests.swift:19:1)
5.  While silgen closureexpr SIL function "@$s13NIOHPACKTests19XCTAssertEqualTuple___4file4lineyx_q_tSgyKXK_AEyKXKSSyXKs12StaticStringVSutSQRzSQR_r0_lFxSgyKXEfu_".
 for expression at [/code/Tests/NIOHPACKTests/HeaderTableTests.swift:31:20 - line:31:25] RangeText="ex1?."
6.  While verifying SIL function "@$s13NIOHPACKTests19XCTAssertEqualTuple___4file4lineyx_q_tSgyKXK_AEyKXKSSyXKs12StaticStringVSutSQRzSQR_r0_lFxSgyKXEfu_".
 for expression at [/code/Tests/NIOHPACKTests/HeaderTableTests.swift:31:20 - line:31:25] RangeText="ex1?."
/usr/bin/swift[0x51d1234]
/usr/bin/swift[0x51cee2e]
/usr/bin/swift[0x51d150c]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f4f09be2890]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f4f0824de97]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f4f0824f801]
/usr/bin/swift[0x5125ca6]
/usr/bin/swift[0x121ddf5]
/usr/bin/swift[0x12060a4]
/usr/bin/swift[0x11ffd66]
/usr/bin/swift[0x9af87b]
/usr/bin/swift[0x9b0bb8]
/usr/bin/swift[0xa13d29]
/usr/bin/swift[0xa048aa]
/usr/bin/swift[0x9f8ad8]
/usr/bin/swift[0xa829b0]
/usr/bin/swift[0x9de87b]
/usr/bin/swift[0xa82b63]
/usr/bin/swift[0xab3eaa]
/usr/bin/swift[0xa9dd42]
/usr/bin/swift[0xab2977]
/usr/bin/swift[0xabd119]
/usr/bin/swift[0xaa2ffa]
/usr/bin/swift[0xaa01b2]
/usr/bin/swift[0xa04890]
/usr/bin/swift[0x9f8ffb]
/usr/bin/swift[0xa6fd83]
/usr/bin/swift[0xa6fc1d]
/usr/bin/swift[0xa20873]
/usr/bin/swift[0x9b8be7]
/usr/bin/swift[0x9ae11c]
/usr/bin/swift[0x9b5bcc]
/usr/bin/swift[0x9b5712]
/usr/bin/swift[0xa6f60c]
/usr/bin/swift[0x9bbb26]
/usr/bin/swift[0x9b72fe]
/usr/bin/swift[0x9b7204]
/usr/bin/swift[0x5611a6]
/usr/bin/swift[0x55e469]
/usr/bin/swift[0x4e8458]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f4f08230b97]
/usr/bin/swift[0x4e7ffa]

Reproduction instructions

git clone https://github.com/Lukasa/swift-nio-http2.git
cd swift-nio-http2
git checkout cb-huffman-pointers
xcrun --toolchain org.swift.53202005041a swift test

swiftlang / swift

[SR-12781] swift-nio-http2 crashes the compiler #55226