[cfe-dev] intermittent lit failure: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp

Johnson, Troy via cfe-dev cfe-dev at lists.llvm.org
Fri Apr 3 12:22:37 PDT 2020

Has anyone tried to reproduce this yet?

From: Richard Smith <richard at metafoo.co.uk>
Sent: Tuesday, March 24, 2020 5:46 PM
To: Johnson, Troy <troy.johnson at hpe.com>; Saar Raz <saar at raz.email>
Cc: cfe-dev at lists.llvm.org <cfe-dev at lists.llvm.org>
Subject: Re: [cfe-dev] intermittent lit failure: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp

+Saar for all things concepts.

On Tue, 24 Mar 2020 at 13:23, Johnson, Troy via cfe-dev <cfe-dev at lists.llvm.org<mailto:cfe-dev at lists.llvm.org>> wrote:
The test fails about 1 in 10 or 20 runs when I execute it via llvm-lit repeatedly in a shell loop.  It encounters a null pointer dereference in this code in clang/lib/AST/StmtProfile.cpp:

void StmtProfiler::VisitConceptSpecializationExpr(
                                           const ConceptSpecializationExpr *S) {

The S->getTemplateArgsAsWritten() call returns null.

I have not been able to determine why the behavior is intermittent.  Is there someone more familiar with this code who has an idea?

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