https://bugs.llvm.org/show_bug.cgi?id=38830
Bug ID: 38830
Summary: Memory corruption with CodeGenOnly in
ThinLTOCodeGenerator
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: alex.b...@gmail.com
CC: llvm-bugs@lists.llvm.org
When running with ThinLTO & CodeGenOnly, TMBuilder.TheTriple is initialized
from multiple threads in a non-thread-safe way.
Pseudocode:
if (CodeGenOnly) {
// Perform only parallel codegen and return.
ThreadPool Pool;
int count = 0;
for (auto &ModuleBuffer : Modules) {
Pool.async([&](int count) {
...
/// Now call OutputBuffer = codegen(*TheModule);
/// Which turns into initTMBuilder(moduleTMBuilder,
Triple(TheModule.getTargetTriple()));
/// Which turns into
TMBuilder.TheTriple = std::move(TheTriple); // std::string = "....."
/// So, basically std::string assignment to same string on multiple
threads = memory corruption
}
return;
}
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