[llvm] [ctx_prof] Flattened profile lowering pass (PR #107329)

Fri Sep 6 16:55:54 PDT 2024

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-expensive-checks-ubuntu` running on `as-builder-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/187/builds/987

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
RUN: at line 1: /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/opt -passes=ctx-prof-flatten /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll -S | /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/FileCheck /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll
+ /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/FileCheck /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll
+ /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/opt -passes=ctx-prof-flatten /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll -S
LLVM ERROR: Function @foo changed by PGOCtxProfFlatteningPass without invalidating analyses
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/opt -passes=ctx-prof-flatten /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll -S
1.	Running pass "ctx-prof-flatten" on module "/home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll"
 #0 0x000056133ed83a2c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Support/Unix/Signals.inc:723:22
 #1 0x000056133ed83e4d PrintStackTraceSignalHandler(void*) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Support/Unix/Signals.inc:798:1
 #2 0x000056133ed8129d llvm::sys::RunSignalHandlers() /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Support/Signals.cpp:105:20
 #3 0x000056133ed832c4 SignalHandler(int) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Support/Unix/Signals.inc:413:1
 #4 0x00007f2416ed4520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #5 0x00007f2416f289fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #6 0x00007f2416ed4476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #7 0x00007f2416eba7f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #8 0x000056133ec945ef llvm::report_fatal_error(llvm::Twine const&, bool) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Support/ErrorHandling.cpp:126:9
 #9 0x000056133bdfda11 llvm::PreservedCFGCheckerInstrumentation::registerCallbacks(llvm::PassInstrumentationCallbacks&, llvm::AnalysisManager<llvm::Module>&)::'lambda1'(llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&)::operator()(llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&) const /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/lib/Passes/StandardInstrumentations.cpp:1436:63
#10 0x000056133be10de7 void llvm::detail::UniqueFunctionBase<void, llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&>::CallImpl<llvm::PreservedCFGCheckerInstrumentation::registerCallbacks(llvm::PassInstrumentationCallbacks&, llvm::AnalysisManager<llvm::Module>&)::'lambda1'(llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&)>(void*, llvm::StringRef, llvm::Any&, llvm::PreservedAnalyses const&) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/include/llvm/ADT/FunctionExtras.h:222:16
#11 0x000056133c1b8729 llvm::unique_function<void (llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&)>::operator()(llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/include/llvm/ADT/FunctionExtras.h:387:62
#12 0x000056133eaac99e void llvm::PassInstrumentation::runAfterPass<llvm::Module, llvm::detail::PassConcept<llvm::Module, llvm::AnalysisManager<llvm::Module>>>(llvm::detail::PassConcept<llvm::Module, llvm::AnalysisManager<llvm::Module>> const&, llvm::Module const&, llvm::PreservedAnalyses const&) const /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/include/llvm/IR/PassInstrumentation.h:265:30
#13 0x000056133eaa98f2 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/include/llvm/IR/PassManagerImpl.h:93:27
#14 0x0000561338bbc8d2 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/tools/opt/NewPMDriver.cpp:541:10
#15 0x0000561338b8cfa9 optMain /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/tools/opt/optdriver.cpp:738:27
#16 0x0000561338b8a7c1 main /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/tools/opt/opt.cpp:25:64
#17 0x00007f2416ebbd90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#18 0x00007f2416ebbe40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#19 0x0000561338b8a6a5 _start (/home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/opt+0xc896a5)
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/build/bin/FileCheck /home/buildbot/worker/as-builder-4/ramdisk/expensive-checks/llvm-project/llvm/test/Analysis/CtxProfAnalysis/flatten-always-removes-instrumentation.ll

--

********************

```

</details>

https://github.com/llvm/llvm-project/pull/107329