<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60499>60499</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            LLVM stage 3 builds on Alpine fail with OOM even though it's not OOM
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Gelbpunkt
      </td>
    </tr>
</table>

<pre>
    This is a very weird issue that I can consistently reproduce in an Alpine Linux environment, for example with a container.

On Alpine Linux, stage 3 builds will always error after reporting "Out of memory" like so:

```
ninja: job failed: : && /build/build/llvm/stage1/bin/clang++ -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fprofile-instr-use="/build/build/llvm/profdata.prof" -flto=thin -fno-common -Woverloaded-virtual -Wno-nested-anon-types -O2 -g -DNDEBUG -Wl,--emit-relocs -fuse-ld=/build/build/llvm/stage1/bin/ld.lld -Wl,--color-diagnostics -fprofile-instr-use="/build/build/llvm/profdata.prof" -flto=thin -Wl,--gc-sections tools/clang/tools/clang-import-test/CMakeFiles/clang-import-test.dir/clang-import-test.cpp.o -o bin/clang-import-test  -Wl,-rpath,"\$ORIGIN/../lib"  lib/libLLVMCore.a lib/libLLVMSupport.a  lib/libLLVMTargetParser.a  lib/libclangAST.a lib/libclangBasic.a  lib/libclangCodeGen.a  lib/libclangDriver.a lib/libclangFrontend.a  lib/libclangLex.a  lib/libclangParse.a lib/libclangSerialization.a  lib/libclangDriver.a  lib/libLLVMWindowsDriver.a lib/libLLVMOption.a  lib/libclangSema.a  lib/libclangEdit.a lib/libclangSupport.a  lib/libclangAnalysis.a  lib/libclangASTMatchers.a lib/libclangAST.a  lib/libclangLex.a  lib/libclangBasic.a lib/libLLVMCoverage.a  lib/libLLVMFrontendHLSL.a  lib/libLLVMLTO.a lib/libLLVMExtensions.a  lib/libPolly.a  lib/libPollyISL.a lib/libLLVMPasses.a  lib/libLLVMCoroutines.a  lib/libLLVMipo.a lib/libLLVMFrontendOpenMP.a  lib/libLLVMLinker.a  lib/libLLVMIRPrinter.a lib/libLLVMInstrumentation.a  lib/libLLVMVectorize.a  lib/libLLVMCodeGen.a lib/libLLVMBitWriter.a  lib/libLLVMObjCARCOpts.a  lib/libLLVMScalarOpts.a lib/libLLVMAggressiveInstCombine.a  lib/libLLVMInstCombine.a lib/libLLVMTarget.a  lib/libLLVMTransformUtils.a  lib/libLLVMAnalysis.a lib/libLLVMProfileData.a  lib/libLLVMSymbolize.a  lib/libLLVMDebugInfoPDB.a lib/libLLVMDebugInfoMSF.a  lib/libLLVMDebugInfoDWARF.a  lib/libLLVMObject.a lib/libLLVMIRReader.a  lib/libLLVMBitReader.a  lib/libLLVMAsmParser.a lib/libLLVMCore.a  lib/libLLVMRemarks.a  lib/libLLVMBitstreamReader.a lib/libLLVMMCParser.a  lib/libLLVMMC.a  lib/libLLVMDebugInfoCodeView.a lib/libLLVMTextAPI.a  lib/libLLVMBinaryFormat.a  lib/libLLVMTargetParser.a lib/libLLVMSupport.a  lib/libLLVMDemangle.a  -lrt  -ldl  -lm  /lib/libz.so && :
LLVM ERROR: out of memory
Allocation failed
clang-17: error: unable to execute command: Aborted (core dumped)
```

The issue is that the system is not out of memory at all. I'm building on a system with an AMD Epyc 7402P (24c/48t) and 256GB of RAM. I wrote a very simple python script to ensure that this is NOT an OOM and my eyes looking at `top` did not fool me:
```py
import humanize
import psutil
import sys
import time

way_too_big_integer = 1 * (10 ** 12) # 1TB
smallest_memory_free = way_too_big_integer
smallest_memory_available = way_too_big_integer
highest_memory_used = 0
highest_percent = 0

while True:
    memory = psutil.virtual_memory()

 smallest_memory_free = min(smallest_memory_free, memory.free)
 smallest_memory_available = min(smallest_memory_available, memory.available)
    highest_memory_used = max(highest_memory_used, memory.used)
    highest_percent = max(highest_percent, memory.percent)

    print(f"Highest Used: {humanize.naturalsize(highest_memory_used)} ({highest_percent}%), Smallest Free: {humanize.naturalsize(smallest_memory_free)}, Smallest Available: {humanize.naturalsize(smallest_memory_available)}")

 time.sleep(0.1)
```
All it does it collect memory usage information every 0.1s and keeps track of the extreme values.

At the end of the build, it shows:
```
Highest Used: 58.7 GB (36.3%), Smallest Free: 132.6 GB, Smallest Available: 150.6 GB
```

So there *is* enough memory for LLVM! 

Here's my container setup:
```bash
podman run \
    --rm \
    -it \
    --name clang \
    --privileged \
    --pids-limit=-1 \
    --ulimit=host \
    --ipc=host \
 --cgroups=disabled \
    --security-opt label=disable \
 alpine:edge ash
```
The flags ensure there are zero limitations to CPU and memory usage in the container. I can build AOSP just fine with the same flags, so the allocation failure is definitely not due to the container setup.

These commands reproduce the error in this container:
```bash
$ mkdir /build && cd /build
# System upgrade
$ apk upgrade
# LLVM dependencies
$ apk add clang cmake git linux-headers lld llvm musl-dev ninja python3 git zlib-dev
# LLVM sources
$ git clone https://github.com/llvm/llvm-project.git --depth 1
$ mkdir -p build/llvm/stage1 && cd build/llvm/stage1

# Stage 1
$ cmake \
 -G Ninja \
    -Wno-dev \
    -DCLANG_ENABLE_ARCMT=OFF \
 -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
    -DCLANG_PLUGIN_SUPPORT=OFF \
    -DLLVM_ENABLE_BINDINGS=OFF \
    -DLLVM_ENABLE_OCAMLDOC=OFF \
    -DLLVM_INCLUDE_DOCS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DCMAKE_C_COMPILER=/usr/bin/clang-15 \
 -DCMAKE_CXX_COMPILER=/usr/bin/clang++ \
 -DLLVM_USE_LINKER=/usr/bin/ld.lld \
 -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-alpine-linux-musl \
 -DLLVM_ENABLE_PROJECTS="clang;lld;bolt;compiler-rt" \
 -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
    -DCOMPILER_RT_BUILD_CRT=OFF \
    -DCOMPILER_RT_BUILD_XRAY=OFF \
 -DCOMPILER_RT_BUILD_SANITIZERS=OFF \
    -DCOMPILER_RT_BUILD_GWP_ASAN=OFF \
    -DLLVM_TARGETS_TO_BUILD=host \
    -DCMAKE_BUILD_TYPE=Release \
    -DLLVM_BUILD_UTILS=OFF \
    -DLLVM_ENABLE_BACKTRACES=OFF \
    -DLLVM_ENABLE_WARNINGS=OFF \
    -DLLVM_INCLUDE_TESTS=OFF \
    -DLLVM_ENABLE_TERMINFO=OFF \
    -DLLVM_PARALLEL_LINK_JOBS=14 \
    /build/llvm-project/llvm
$ ninja

$ mkdir ../stage2 && cd ../stage2

# Stage 2
$ cmake \
    -G Ninja \
    -Wno-dev \
    -DCLANG_ENABLE_ARCMT=OFF \
 -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
    -DCLANG_PLUGIN_SUPPORT=OFF \
    -DLLVM_ENABLE_BINDINGS=OFF \
    -DLLVM_ENABLE_OCAMLDOC=OFF \
    -DLLVM_INCLUDE_DOCS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DCMAKE_AR=/build/build/llvm/stage1/bin/llvm-ar \
 -DCMAKE_C_COMPILER=/build/build/llvm/stage1/bin/clang \
 -DCLANG_TABLEGEN=/build/build/llvm/stage1/bin/clang-tblgen \
 -DCMAKE_CXX_COMPILER=/build/build/llvm/stage1/bin/clang++ \
 -DLLVM_USE_LINKER=/build/build/llvm/stage1/bin/ld.lld \
 -DLLVM_TABLEGEN=/build/build/llvm/stage1/bin/llvm-tblgen \
 -DCMAKE_RANLIB=/build/build/llvm/stage1/bin/llvm-ranlib \
 -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-alpine-linux-musl \
 -DLLVM_ENABLE_PROJECTS="clang;lld" \
 -DLLVM_TARGETS_TO_BUILD="ARM;AArch64;X86" \
 -DCMAKE_BUILD_TYPE=RelWithDebInfo \
 -DCMAKE_INSTALL_PREFIX=/build/install \
    -DLLVM_BUILD_INSTRUMENTED=IR \
    -DLLVM_BUILD_RUNTIME=OFF \
    -DLLVM_LINK_LLVM_DYLIB=ON \
 -DLLVM_VP_COUNTERS_PER_SITE=6 \
    -DLLVM_ENABLE_TERMINFO=OFF \
 -DLLVM_PARALLEL_LINK_JOBS=14 \
    /build/llvm-project/llvm
$ ninja

# Here I do some PGO profiles with Linux kernels
$ apk add bash bison curl coreutils diffutils elfutils-dev findutils flex make openssl-dev patch perl xz
$ git clone https://github.com/ClangBuiltLinux/tc-build.git /build/tc-build
$ /build/tc-build/kernel/build.sh --pgo -t "ARM;AArch64;X86" -b /build/build/llvm

$ ../stage1/bin/llvm-profdata merge -output /build/build/llvm/profdata.prof profiles/*.profraw

# Stage 3

$ mkdir ../stage3 && cd ../stage3

$ cmake \
    -G Ninja \
 -Wno-dev \
    -DCLANG_ENABLE_ARCMT=OFF \
 -DCLANG_ENABLE_STATIC_ANALYZER=OFF \
    -DCLANG_PLUGIN_SUPPORT=OFF \
    -DLLVM_ENABLE_BINDINGS=OFF \
    -DLLVM_ENABLE_OCAMLDOC=OFF \
    -DLLVM_INCLUDE_DOCS=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DCMAKE_AR=/build/build/llvm/stage1/bin/llvm-ar \
 -DCMAKE_C_COMPILER=/build/build/llvm/stage1/bin/clang \
 -DCLANG_TABLEGEN=/build/build/llvm/stage1/bin/clang-tblgen \
 -DCMAKE_CXX_COMPILER=/build/build/llvm/stage1/bin/clang++ \
 -DLLVM_USE_LINKER=/build/build/llvm/stage1/bin/ld.lld \
 -DLLVM_TABLEGEN=/build/build/llvm/stage1/bin/llvm-tblgen \
 -DCMAKE_RANLIB=/build/build/llvm/stage1/bin/llvm-ranlib \
 -DLLVM_DEFAULT_TARGET_TRIPLE=x86_64-alpine-linux-musl \
 -DLLVM_ENABLE_PROJECTS="clang;compiler-rt;lld;polly;bolt" \
 -DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
    -DCOMPILER_RT_BUILD_CRT=OFF \
    -DCOMPILER_RT_BUILD_XRAY=OFF \
 -DCOMPILER_RT_BUILD_GWP_ASAN=OFF \
 -DLLVM_TARGETS_TO_BUILD="ARM;AArch64;X86" \
 -DCMAKE_BUILD_TYPE=RelWithDebInfo \
 -DCMAKE_INSTALL_PREFIX=/build/install \
 -DLLVM_PROFDATA_FILE=/build/build/llvm/profdata.prof \
 -DLLVM_ENABLE_LTO=Thin \
 -DCMAKE_EXE_LINKER_FLAGS="-Wl,--emit-relocs" \
 -DLLVM_ENABLE_TERMINFO=OFF \
    -DLLVM_PARALLEL_LINK_JOBS=14 \
 /build/llvm-project/llvm
$ ninja
```
I've been using 14 link jobs to try to circumvent this, but it hasn't changed anything compared to 48.

I am guessing that this is somehow related to musl. I vaguely remember that it [has a lower thread stack size than glibc](https://wiki.musl-libc.org/functional-differences-from-glibc.html#Thread_stack_size), would it be possible that this is the reason for the error? Adding `-DCMAKE_EXE_LINKER_FLAGS="-Wl,-z,stack-size=2097152"` doesn't help, but maybe I misunderstand how I would raise the stack size.
</pre>
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