| Issue |
209073
|
| Summary |
[flang] Crash in prescanner when handling malformed preprocessor directives / comment lines
|
| Labels |
flang
|
| Assignees |
|
| Reporter |
YuanchengJiang
|
The following code:
```fortran
// RUN: fir-opt --split-input-file --cuf-device-global="cuda-unified=true" %s | FileCheck %s --check-prefix=UNIFIED
+test)
#else
```
Resulted in this output:
```
fatal internal error: CHECK(*at_ != '\n') failed at flang/lib/Parser/prescan.cpp(577)
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
Stack dump:
0. Program arguments: /usr/lib/llvm-22/bin/flang -fc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelocation-model pic -pic-level 2 -pic-is-pie -target-cpu x86-64 -resource-dir /usr/lib/llvm-22/lib/clang/22 -mframe-pointer=all -o /tmp/test-dbc286.o -x f95 /tmp/test.F
#0 0x00007f4e236b7d5f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-22/lib/libLLVM.so.22.1+0x4dc7d5f)
#1 0x00007f4e236b55d7 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-22/lib/libLLVM.so.22.1+0x4dc55d7)
#2 0x00007f4e236b8b2a (/usr/lib/llvm-22/lib/libLLVM.so.22.1+0x4dc8b2a)
#3 0x00007f4e1e38c330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007f4e1e3e5b2c pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x9eb2c)
#5 0x00007f4e1e38c27e raise (/lib/x86_64-linux-gnu/libc.so.6+0x4527e)
#6 0x00007f4e1e36f8ff abort (/lib/x86_64-linux-gnu/libc.so.6+0x288ff)
#7 0x00005556be5db61c (/usr/lib/llvm-22/bin/flang+0x2b2061c)
#8 0x00005556be2c1a60 Fortran::parser::Prescanner::QuotedCharacterLiteral(Fortran::parser::TokenSequence&, char const*) (/usr/lib/llvm-22/bin/flang+0x2806a60)
#9 0x00005556be2be534 Fortran::parser::Prescanner::NextToken(Fortran::parser::TokenSequence&) (/usr/lib/llvm-22/bin/flang+0x2803534)
#10 0x00005556be2bb6eb Fortran::parser::Prescanner::Statement() (/usr/lib/llvm-22/bin/flang+0x28006eb)
#11 0x00005556be2ba5f8 Fortran::parser::Prescanner::Prescan(Fortran::common::Interval<Fortran::parser::Provenance>) (/usr/lib/llvm-22/bin/flang+0x27ff5f8)
#12 0x00005556be2a8052 Fortran::parser::Parsing::Prescan(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&, Fortran::parser::Options) (/usr/lib/llvm-22/bin/flang+0x27ed052)
#13 0x00005556bc685732 Fortran::frontend::FrontendAction::runPrescan() (/usr/lib/llvm-22/bin/flang+0xbca732)
#14 0x00005556bc68a7b5 Fortran::frontend::CodeGenAction::beginSourceFileAction() (/usr/lib/llvm-22/bin/flang+0xbcf7b5)
#15 0x00005556bc684f9e Fortran::frontend::FrontendAction::beginSourceFile(Fortran::frontend::CompilerInstance&, Fortran::frontend::FrontendInputFile const&) (/usr/lib/llvm-22/bin/flang+0xbc9f9e)
#16 0x00005556bc66ce7f Fortran::frontend::CompilerInstance::executeAction(Fortran::frontend::FrontendAction&) (/usr/lib/llvm-22/bin/flang+0xbb1e7f)
#17 0x00005556bc689ba0 Fortran::frontend::executeCompilerInvocation(Fortran::frontend::CompilerInstance*) (/usr/lib/llvm-22/bin/flang+0xbceba0)
#18 0x00005556bc66ad34 fc1_main(llvm::ArrayRef<char const*>, char const*) (/usr/lib/llvm-22/bin/flang+0xbafd34)
#19 0x00005556bc669fa4 main (/usr/lib/llvm-22/bin/flang+0xbaefa4)
#20 0x00007f4e1e3711ca (/lib/x86_64-linux-gnu/libc.so.6+0x2a1ca)
#21 0x00007f4e1e37128b __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28b)
#22 0x00005556bc668f45 _start (/usr/lib/llvm-22/bin/flang+0xbadf45)
flang-22: error: unable to execute command: Aborted (core dumped)
flang-22: error: flang frontend command failed due to signal (use -v to see invocation)
Ubuntu flang version 22.1.8 (++20260613092238+e80beda6e255-1~exp1~20260613092253.78)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-22/bin
flang-22: error: unable to execute command: Aborted (core dumped)
flang-22: note: diagnostic msg: Error generating preprocessed source(s).
```
To reproduce:
```
flang ./test.F
```
Compiler version:
```
Ubuntu flang version 22.1.8 (++20260613092238+e80beda6e255-1~exp1~20260613092253.78)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-22/bin
```
*This bug was found by [fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)*
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