| Issue |
56667
|
| Summary |
[Modules] Clang crashes when instantiating struct in another module
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
onelumin
|
If a instance of the `msg` struct does not exist in the `msg` module, the `send` module causes clang to segfault with little information given.
However, if a `void a() { msg a; }` or simply `msg a;` occurs at the end of the `msg` module, everything compiles and works. The example below is very fragile and also depends on `std::equal_to<string_type>` to produce the error. I was unable to find a root cause for this since the backtrace was not very useful.
FILE **msg.cc** (compiles)
[generated preprocessed source](https://github.com/llvm/llvm-project/files/9164587/msg-00472d.cpp.txt)
[generated run script](https://github.com/llvm/llvm-project/files/9164590/msg-00472d.sh.txt)
```c++
module;
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/unordered_map.hpp>
export module msg;
namespace ipc = boost::interprocess;
export struct msg {
using manager = ipc::managed_shared_memory::segment_manager;
using string_type = ipc::basic_string<char, std::char_traits<char>, ipc::allocator<char, manager>>;
boost::unordered_map<int, int, boost::hash<int>, std::equal_to<string_type>> envadds;
};
```
FILE **send.cc** (clang segmentation fault)
[-E preprocessed_source](https://github.com/llvm/llvm-project/files/9164475/preprocessed_send.txt) (-gen-reproducer does not work)
```c++
module;
#include <boost/interprocess/containers/string.hpp>
#include <boost/unordered_map.hpp>
export module send;
import msg;
void a() { msg a; }
```
**if msg.cc is changed to this, send.cc compiles fine!**
```c++
module;
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/string.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/unordered_map.hpp>
export module msg;
namespace ipc = boost::interprocess;
export struct msg {
using manager = ipc::managed_shared_memory::segment_manager;
using string_type = ipc::basic_string<char, std::char_traits<char>, ipc::allocator<char, manager>>;
boost::unordered_map<int, int, boost::hash<int>, std::equal_to<string_type>> envadds;
};
void a() { msg a; }
```
**otherwise:**
```
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: clang++ -std=c++2b -stdlib=libc++ -fmodules -Xclang -emit-module-interface -c send.cc -o send.pcm -fmodule-file=msg=msg.pcm
1. <eof> parser at end of file
2. /usr/include/boost/unordered/unordered_map.hpp:86:7: instantiating function definition 'boost::unordered::unordered_map<int, int, boost::hash<int>, #0 0x00007f16758d553a (/usr/lib/libLLVM-14.so+0xcd553a)
#1 0x00007f16758d2bcf llvm::sys::RunSignalHandlers() (/usr/lib/libLLVM-14.so+0xcd2bcf)
#2 0x00007f16758d2d1d (/usr/lib/libLLVM-14.so+0xcd2d1d)
#3 0x00007f167443e8e0 (/usr/lib/libc.so.6+0x3e8e0)
#4 0x00007f167cab3382 (/usr/lib/libclang-cpp.so.14+0xcb3382)
#5 0x00007f167cab3301 (/usr/lib/libclang-cpp.so.14+0xcb3301)
#6 0x00007f167cab388b (/usr/lib/libclang-cpp.so.14+0xcb388b)
#7 0x00007f167cab4072 (/usr/lib/libclang-cpp.so.14+0xcb4072)
#8 0x00007f167cab4a70 (/usr/lib/libclang-cpp.so.14+0xcb4a70)
#9 0x00007f167cab5914 (/usr/lib/libclang-cpp.so.14+0xcb5914)
#10 0x00007f167cab7f19 clang::QualType::print(clang::Type const*, clang::Qualifiers, llvm::raw_ostream&, clang::PrintingPolicy const&, llvm::Twine const&, unsigned int) (/usr/lib/libclang-cpp.so.14+0xcb7f19)
#11 0x00007f167ca83280 clang::TemplateArgument::print(clang::PrintingPolicy const&, llvm::raw_ostream&, bool) const (/usr/lib/libclang-cpp.so.14+0xc83280)
#12 0x00007f167cab3c57 (/usr/lib/libclang-cpp.so.14+0xcb3c57)
#13 0x00007f167cab4a70 (/usr/lib/libclang-cpp.so.14+0xcb4a70)
#14 0x00007f167cab5914 (/usr/lib/libclang-cpp.so.14+0xcb5914)
#15 0x00007f167cab7f19 clang::QualType::print(clang::Type const*, clang::Qualifiers, llvm::raw_ostream&, clang::PrintingPolicy const&, llvm::Twine const&, unsigned int) (/usr/lib/libclang-cpp.so.14+0xcb7f19)
#16 0x00007f167ca83280 clang::TemplateArgument::print(clang::PrintingPolicy const&, llvm::raw_ostream&, bool) const (/usr/lib/libclang-cpp.so.14+0xc83280)
#17 0x00007f167cab3c57 (/usr/lib/libclang-cpp.so.14+0xcb3c57)
#18 0x00007f167c861775 clang::NamedDecl::printNestedNameSpecifier(llvm::raw_ostream&, clang::PrintingPolicy const&) const (/usr/lib/libclang-cpp.so.14+0xa61775)
#19 0x00007f167c861d57 clang::NamedDecl::printQualifiedName(llvm::raw_ostream&, clang::PrintingPolicy const&) const (/usr/lib/libclang-cpp.so.14+0xa61d57)
#20 0x00007f167c86262d clang::FunctionDecl::getNameForDiagnostic(llvm::raw_ostream&, clang::PrintingPolicy const&, bool) const (/usr/lib/libclang-cpp.so.14+0xa6262d)
#21 0x00007f167c8559a3 clang::PrettyDeclStackTraceEntry::print(llvm::raw_ostream&) const (/usr/lib/libclang-cpp.so.14+0xa559a3)
#22 0x00007f167581a2a7 (/usr/lib/libLLVM-14.so+0xc1a2a7)
#23 0x00007f16758d2bcf llvm::sys::RunSignalHandlers() (/usr/lib/libLLVM-14.so+0xcd2bcf)
#24 0x00007f16757bfac9 (/usr/lib/libLLVM-14.so+0xbbfac9)
#25 0x00007f167443e8e0 (/usr/lib/libc.so.6+0x3e8e0)
#26 0x00007f167cab3382 (/usr/lib/libclang-cpp.so.14+0xcb3382)
#27 0x00007f167cab3301 (/usr/lib/libclang-cpp.so.14+0xcb3301)
#28 0x00007f167cab388b (/usr/lib/libclang-cpp.so.14+0xcb388b)
#29 0x00007f167cab4072 (/usr/lib/libclang-cpp.so.14+0xcb4072)
#30 0x00007f167cab4a70 (/usr/lib/libclang-cpp.so.14+0xcb4a70)
#31 0x00007f167cab5914 (/usr/lib/libclang-cpp.so.14+0xcb5914)
#32 0x00007f167cab7f19 clang::QualType::print(clang::Type const*, clang::Qualifiers, llvm::raw_ostream&, clang::PrintingPolicy const&, llvm::Twine const&, unsigned int) (/usr/lib/libclang-cpp.so.14+0xcb7f19)
#33 0x00007f167ca83280 clang::TemplateArgument::print(clang::PrintingPolicy const&, llvm::raw_ostream&, bool) const (/usr/lib/libclang-cpp.so.14+0xc83280)
#34 0x00007f167cab3c57 (/usr/lib/libclang-cpp.so.14+0xcb3c57)
#35 0x00007f167cab4a70 (/usr/lib/libclang-cpp.so.14+0xcb4a70)
#36 0x00007f167cab5914 (/usr/lib/libclang-cpp.so.14+0xcb5914)
#37 0x00007f167cab7f19 clang::QualType::print(clang::Type const*, clang::Qualifiers, llvm::raw_ostream&, clang::PrintingPolicy const&, llvm::Twine const&, unsigned int) (/usr/lib/libclang-cpp.so.14+0xcb7f19)
#38 0x00007f167ca83280 clang::TemplateArgument::print(clang::PrintingPolicy const&, llvm::raw_ostream&, bool) const (/usr/lib/libclang-cpp.so.14+0xc83280)
#39 0x00007f167cab3c57 (/usr/lib/libclang-cpp.so.14+0xcb3c57)
#40 0x00007f167c861775 clang::NamedDecl::printNestedNameSpecifier(llvm::raw_ostream&, clang::PrintingPolicy const&) const (/usr/lib/libclang-cpp.so.14+0xa61775)
#41 0x00007f167c861d57 clang::NamedDecl::printQualifiedName(llvm::raw_ostream&, clang::PrintingPolicy const&) const (/usr/lib/libclang-cpp.so.14+0xa61d57)
#42 0x00007f167c8c24f0 clang::PredefinedExpr::ComputeName[abi:cxx11](clang::PredefinedExpr::IdentKind, clang::Decl const*) (/usr/lib/libclang-cpp.so.14+0xac24f0)
#43 0x00007f167ced2d2a clang::Sema::BuildPredefinedExpr(clang::SourceLocation, clang::PredefinedExpr::IdentKind) (/usr/lib/libclang-cpp.so.14+0x10d2d2a)
#44 0x00007f167d20a4ec (/usr/lib/libclang-cpp.so.14+0x140a4ec)
#45 0x00007f167d2202b6 (/usr/lib/libclang-cpp.so.14+0x14202b6)
#46 0x00007f167d20f70e (/usr/lib/libclang-cpp.so.14+0x140f70e)
#47 0x00007f167d212401 (/usr/lib/libclang-cpp.so.14+0x1412401)
#48 0x00007f167d210da2 (/usr/lib/libclang-cpp.so.14+0x1410da2)
#49 0x00007f167d213e85 (/usr/lib/libclang-cpp.so.14+0x1413e85)
#50 0x00007f167d22b201 (/usr/lib/libclang-cpp.so.14+0x142b201)
#51 0x00007f167d22daaf (/usr/lib/libclang-cpp.so.14+0x142daaf)
#52 0x00007f167d22b67c clang::Sema::SubstStmt(clang::Stmt*, clang::MultiLevelTemplateArgumentList const&) (/usr/lib/libclang-cpp.so.14+0x142b67c)
#53 0x00007f167d257635 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/usr/lib/libclang-cpp.so.14+0x1457635)
#54 0x00007f167d257f13 clang::Sema::PerformPendingInstantiations(bool) (/usr/lib/libclang-cpp.so.14+0x1457f13)
#55 0x00007f167d257722 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/usr/lib/libclang-cpp.so.14+0x1457722)
#56 0x00007f167d257f13 clang::Sema::PerformPendingInstantiations(bool) (/usr/lib/libclang-cpp.so.14+0x1457f13)
#57 0x00007f167d257722 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/usr/lib/libclang-cpp.so.14+0x1457722)
#58 0x00007f167d257f13 clang::Sema::PerformPendingInstantiations(bool) (/usr/lib/libclang-cpp.so.14+0x1457f13)
#59 0x00007f167d257722 clang::Sema::InstantiateFunctionDefinition(clang::SourceLocation, clang::FunctionDecl*, bool, bool, bool) (/usr/lib/libclang-cpp.so.14+0x1457722)
#60 0x00007f167d257f13 clang::Sema::PerformPendingInstantiations(bool) (/usr/lib/libclang-cpp.so.14+0x1457f13)
#61 0x00007f167ccd2551 (/usr/lib/libclang-cpp.so.14+0xed2551)
#62 0x00007f167ccc5e55 clang::Sema::ActOnEndOfTranslationUnit() (/usr/lib/libclang-cpp.so.14+0xec5e55)
#63 0x00007f167c68fc91 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) (/usr/lib/libclang-cpp.so.14+0x88fc91)
#64 0x00007f167c5d9e38 clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/libclang-cpp.so.14+0x7d9e38)
#65 0x00007f167dbb3929 clang::FrontendAction::Execute() (/usr/lib/libclang-cpp.so.14+0x1db3929)
#66 0x00007f167db52df7 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/usr/lib/libclang-cpp.so.14+0x1d52df7)
#67 0x00007f167dc0a78a clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/usr/lib/libclang-cpp.so.14+0x1e0a78a)
#68 0x000055b93c51b6f1 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/usr/bin/clang-14+0x176f1)
#69 0x000055b93c51d337 (/usr/bin/clang-14+0x19337)
#70 0x00007f167d8aa699 (/usr/lib/libclang-cpp.so.14+0x1aaa699)
#71 0x00007f16757bfb97 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/usr/lib/libLLVM-14.so+0xbbfb97)
#72 0x00007f167d8b01ff (/usr/lib/libclang-cpp.so.14+0x1ab01ff)
#73 0x00007f167d8c5903 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&) const (/usr/lib/libclang-cpp.so.14+0x1ac5903)
#74 0x00007f167d8c5cd9 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const (/usr/lib/libclang-cpp.so.14+0x1ac5cd9)
#75 0x00007f167d8ce012 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) (/usr/lib/libclang-cpp.so.14+0x1ace012)
#76 0x000055b93c51246a main (/usr/bin/clang-14+0xe46a)
#77 0x00007f1674429290 (/usr/lib/libc.so.6+0x29290)
#78 0x00007f167442934a __libc_start_main (/usr/lib/libc.so.6+0x2934a)
#79 0x000055b93c513655 _start (/usr/bin/clang-14+0xf655)
./build.sh: line 4: 372918 Segmentation fault (core dumped) clang++ -std=c++2b -stdlib=libc++ -fmodules -Xclang -emit-module-interface -c send.cc -o send.pcm -fmodule-file=msg=msg.pcm
```
The example can be compiled with:
```sh
#!/bin/sh
clang++ -std=c++2b -stdlib=libc++ -fmodules -Xclang -emit-module-interface -c msg.cc -o msg.pcm
clang++ -std=c++2b -stdlib=libc++ -fmodules -Xclang -emit-module-interface -c send.cc -o send.pcm -fmodule-file=msg=msg.pcm
```
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