luporl wrote:
In my debug build, clang is receiving a SIGSEGV in frame 7 below (that is
actually frame 0, as the frames below it are from a gdb call that received a
signal). In it, `this` holds an invalid address.
In frame 8, `NE` is 0x3fffffff, which probably caused the invalid access.
In frame 12, `NumElements.V` is 0xffffffff, which may be the cause of the huge
`NE` value later.
I stopped there, as I lack experience with clang's sources.
Please let me know if you need more information or help with reproducing the
issue with qemu.
```
#7 0xe55f55cc in clang::interp::Integral<32u, true>::Integral (this=0x57f000)
at /home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/Integral.h:69
#8 0xe55f3e4e in ctorArrayTy<clang::interp::Integral<32, true> >
(Ptr=0x575a20, D=0x577240) at
/home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/Descriptor.cpp:48
#9 0xe5639e06 in clang::interp::Block::invokeCtor (this=0x5759e8) at
/home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/InterpBlock.h:120
#10 0xe56e5f52 in clang::interp::DynamicAllocator::allocate (this=0xfffec530,
D=0x577240, EvalID=88) at
/home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/DynamicAllocator.cpp:69
#11 0xe56e5df6 in clang::interp::DynamicAllocator::allocate (this=0xfffec530,
Source=0x575220, T=clang::interp::PT_Sint32, NumElements=4294967295, EvalID=88)
at
/home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/DynamicAllocator.cpp:50
#12 0xe5644402 in clang::interp::AllocN<(clang::interp::PrimType)5,
clang::interp::Integral<32u, false> > (S=..., OpPC=...,
T=clang::interp::PT_Sint32, Source=0x575220, IsNoThrow=true)
at /home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/Interp.h:2841
#13 0xe56ee890 in clang::interp::Interpret (S=..., Result=...) at
/home/leandro.lupori/git/ci/build/tools/clang/lib/AST/Opcodes.inc:901
#14 0xe563f126 in clang::interp::Call (S=..., OpPC=..., Func=0x5760e0,
VarArgSize=0) at
/home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/Interp.h:2554
#15 0xe561e956 in clang::interp::EvalEmitter::emitCall (this=0xfffec428,
A0=0x5760e0, A1=0, L=...) at
/home/leandro.lupori/git/ci/build/tools/clang/lib/AST/Opcodes.inc:3495
#16 0xe55cb414 in
clang::interp::Compiler<clang::interp::EvalEmitter>::VisitCallExpr
(this=0xfffec428, E=0x576270)
at /home/leandro.lupori/git/ci/llvm/clang/lib/AST/Interp/Compiler.cpp:4031
#17 0xe55e2814 in clang::StmtVisitorBase<llvm::make_const_ptr,
clang::interp::Compiler<clang::interp::EvalEmitter>, bool>::Visit
(this=0xfffec428, S=0x576270)
at
/home/leandro.lupori/git/ci/build/tools/clang/include/clang/AST/StmtNodes.inc:602
```
https://github.com/llvm/llvm-project/pull/70306
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