llvm/llvm-project
crash when section has `.cfi_startproc` but no `.cfi_endproc`
Fermée
#177 852 ouverte le 25 janv. 2026
crashgood first issuellvm:mc
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Description
LLVM crashes on this program
https://godbolt.org/z/9W51vc3bW
module asm ".pushsection .text.foo,\22ax\22, @progbits"
module asm ".type foo, @function"
module asm "foo:"
module asm ".cfi_startproc"
module asm ".popsection"
module asm ".type bar, @function"
module asm "bar:"
module asm ".cfi_startproc"
module asm ".cfi_endproc"
llc: /root/llvm-project/llvm/lib/MC/MCExpr.cpp:223: llvm::MCSymbolRefExpr::MCSymbolRefExpr(const llvm::MCSymbol*, llvm::MCExpr::Spec, const llvm::MCAsmInfo*, llvm::SMLoc): Assertion `Symbol' failed.
This assembly is malformed (but in a way that might come up during development). When the .popsection is removed, we actually get a nice error:
<inline asm>:8:1: error: starting new .cfi frame before finishing the previous one
.cfi_endproc
^
Compiler returned: 1
I think that .popsection should emit an error when the section opened a CFI scope that wasn't yet closed.