compiler segfault when building project in release mode only

this commit of swift-unidoc crashes the compiler with a segfault.

error: compile command failed due to signal 11 (use -v to see invocation)
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the crash backtrace.
Stack dump:
0.      Program arguments: /usr/bin/swift-frontend -frontend -c /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/Demangler.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/DiagnosticContext.Group.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/DiagnosticContext.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/DiagnosticSubject.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/DiagnosticSymbolicator.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Diagnostic.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/DiagnosticNote.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/InvalidAutolinkError.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/InvalidCodelinkError.Note.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/InvalidCodelinkError.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/DiagnosticMessage.Severity.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/DiagnosticMessage.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/DiagnosticOutput.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/SourceContext.Line.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/SourceContext.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/TerminalColor.swift /swift/swift-unidoc/Sources/UnidocDiagnostics/Messages/TerminalColors.swift -supplementary-output-file-map /tmp/TemporaryDirectory.L4JLMr/supplementaryOutputs-1 -target x86_64-unknown-linux-gnu -disable-objc-interop -I /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release -color-diagnostics -g -module-cache-path /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/ModuleCache -swift-version 5 -O -D SWIFT_PACKAGE -new-driver-path /usr/bin/swift-driver -enable-experimental-feature StrictConcurrency -enable-upcoming-feature BareSlashRegexLiterals -enable-upcoming-feature ConciseMagicFile -enable-upcoming-feature ExistentialAny -empty-abi-descriptor -resource-dir /usr/lib/swift -Xcc -fPIC -module-name UnidocDiagnostics -package-name swift_unidoc -plugin-path /usr/lib/swift/host/plugins -plugin-path /usr/local/lib/swift/host/plugins -enable-default-cmo -parse-as-library -num-threads 12 -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Contexts/Demangler.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Contexts/DiagnosticContext.Group.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Contexts/DiagnosticContext.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Contexts/DiagnosticSubject.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Contexts/DiagnosticSymbolicator.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Diagnostic.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/DiagnosticNote.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/InvalidAutolinkError.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/InvalidCodelinkError.Note.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/InvalidCodelinkError.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/DiagnosticMessage.Severity.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/DiagnosticMessage.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/DiagnosticOutput.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/SourceContext.Line.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/SourceContext.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/TerminalColor.swift.o -o /swift/swift-unidoc/.build/x86_64-unknown-linux-gnu/release/UnidocDiagnostics.build/Messages/TerminalColors.swift.o
1.      Swift version 5.9.1 (swift-5.9.1-RELEASE)
2.      Compiling with the current language version
3.      While evaluating request ExecuteSILPipelineRequest(Run pipelines { PrepareOptimizationPasses, EarlyModulePasses, HighLevel,Function+EarlyLoopOpt, HighLevel,Module+StackPromote, MidLevel,Function, ClosureSpecialize, LowLevel,Function, LateLoopOpt, SIL Debug Info Generator } on SIL for UnidocDiagnostics)
4.      While running pass #509 SILFunctionTransform "ComputeSideEffects" on SILFunction "@$s17UnidocDiagnostics22DiagnosticSymbolicatorPAAE11symbolicateySayAA0C7MessageOGAA0C7ContextVyxGnF".
 for 'symbolicate(_:)' (at /swift/swift-unidoc/Sources/UnidocDiagnostics/Contexts/DiagnosticSymbolicator.swift:40:5)
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
/usr/bin/swift-frontend(+0x6023253)[0x55a04a9cc253]
/usr/bin/swift-frontend(+0x602117e)[0x55a04a9ca17e]
/usr/bin/swift-frontend(+0x60235cf)[0x55a04a9cc5cf]
/lib64/libpthread.so.0(+0x118e0)[0x7f971b3f98e0]
/usr/bin/swift-frontend(+0x19b5592)[0x55a04635e592]

*** Program crashed: Bad pointer dereference at 0x00007ffcc879aff8 ***

Thread 0 "swift-frontend" crashed:

0  0x000055a04635e592 swift::SILInstruction::mayRelease() const + 2 in swift-frontend

Registers:

rax 0x00000000000000c4  196
rdx 0x000055a04e02b2b0  40 b2 02 4e a0 55 00 00 40 b3 02 4e a0 55 00 00  @²·N U··@³·N U··
rcx 0x000055a04635e67e  66 90 8a 47 38 3c d3 74 08 3c 4b 74 04 3c 4d 75  f··G8<Ót·<Kt·<Mu
rbx 0x000055a04bf61f24  28 c7 3f fa 28 c7 3f fa 5a c7 3f fa 5a c7 3f fa  (Ç?ú(Ç?úZÇ?úZÇ?ú
rsi 0x000055a04e02b2b0  40 b2 02 4e a0 55 00 00 40 b3 02 4e a0 55 00 00  @²·N U··@³·N U··
rdi 0x0000000000000000  0
rbp 0x000055a04e02b2b0  40 b2 02 4e a0 55 00 00 40 b3 02 4e a0 55 00 00  @²·N U··@³·N U··
rsp 0x00007ffcc879b000  d8 b2 02 4e a0 55 00 00 00 00 00 00 00 00 00 00  Ø²·N U··········
 r8 0x0000000000000000  0
 r9 0x000055a04cf29230  00 00 00 00 00 00 00 00 48 90 f2 4c a0 55 00 00  ········H·òL U··
r10 0x000055a04e16f028  48 e8 1c 1b 97 7f 00 00 38 9f 0e 1b 97 7f 00 00  Hè······8·······
r11 0x000055a04d0be0a0  0a 00 23 00 2a 02 d3 00 69 02 8b 02 95 02 45 00  ··#·*·Ó·i·····E·
r12 0x0000010101010101  1103823438081
r13 0x0000000000000000  0
r14 0x000055a04e02b2d8  30 92 f2 4c a0 55 00 00 ff ff ff ff 03 00 00 00  0·òL U··ÿÿÿÿ····
r15 0x00007ffcc8f92d90  68 b2 02 4e a0 55 00 00 00 f0 ff ff ff ff ff ff  h²·N U···ðÿÿÿÿÿÿ
rip 0x000055a04635e592  53 50 48 89 fb 8a 47 38 8d 48 66 80 f9 30 77 13  SPH·û·G8·Hf·ù0w·

rflags 0x0000000000010a16  AF PF

cs 0x0033  fs 0x0000  gs 0x0000

Images (33 omitted):

0x000055a0449a9000–0x000055a04b5528c0 <no build ID> swift-frontend /usr/bin/swift-frontend

[153/624] Compiling tls13_client.cc

debug builds don’t seem to be affected.

$ swift --version
Swift version 5.9.1 (swift-5.9.1-RELEASE)
Target: x86_64-unknown-linux-gnu

swiftlang / swift

compiler segfault when building project in release mode only #69768