Segmentation fault in codegenprepare pass

[zhangxiaosa]

I found a segmentation fault in codegenprepare pass, and this is how to reproduce:
Bug-triggering program:

$ cat input.ll
define i32 @a() { ret i32 0 }

LLVM version:

$ git rev-parse --short HEAD
7c8176ebd39c
$ ./opt --version
LLVM (http://llvm.org/):
  LLVM version 19.0.0git
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: icelake-server

Command to reproduce:

$ ./opt -passes=codegenprepare input.ll
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: ./opt -passes=codegenprepare input.ll
 #0 0x0000557b3f481740 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (./opt+0x44fd740)
 #1 0x0000557b3f47ed0e SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f99e987b520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x0000557b3d78b6ad llvm::CodeGenPreparePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0x28076ad)
 #4 0x0000557b3ca63506 llvm::detail::PassModel<llvm::Function, llvm::CodeGenPreparePass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0x1adf506)
 #5 0x0000557b3bb2c660 llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0xba8660)
 #6 0x0000557b3f27b7ea llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0x42f77ea)
 #7 0x0000557b3bb1fa36 llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0xb9ba36)
 #8 0x0000557b3f2785e7 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0x42f45e7)
 #9 0x0000557b3b6b7fd6 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (./opt+0x733fd6)
#10 0x0000557b3b6ab897 optMain (./opt+0x727897)
#11 0x00007f99e9862d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#12 0x00007f99e9862e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#13 0x0000557b3b6a22d5 _start (./opt+0x71e2d5)
Segmentation fault (core dumped)

[dtcxzyw]

Can you try ./opt -passes='require<profile-summary>,function(codegenprepare)' input.ll?

See #77182.
cc @nickleus27

[zhangxiaosa]

Here is the result:

$ ./opt -passes='require<profile-summary>,function(codegenprepare)' input.ll
WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: ./opt -passes=require<profile-summary>,function(codegenprepare) input.ll
 #0 0x0000563cfb908740 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (./opt+0x44fd740)
 #1 0x0000563cfb905d0e SignalHandler(int) Signals.cpp:0:0
 #2 0x00007f6a6674a520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x0000563cf9c126ad llvm::CodeGenPreparePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0x28076ad)
 #4 0x0000563cf8eea506 llvm::detail::PassModel<llvm::Function, llvm::CodeGenPreparePass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0x1adf506)
 #5 0x0000563cf7fb3660 llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (./opt+0xba8660)
 #6 0x0000563cfb7027ea llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0x42f77ea)
 #7 0x0000563cf7fa6a36 llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0xb9ba36)
 #8 0x0000563cfb6ff5e7 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (./opt+0x42f45e7)
 #9 0x0000563cf7b3efd6 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (./opt+0x733fd6)
#10 0x0000563cf7b32897 optMain (./opt+0x727897)
#11 0x00007f6a66731d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#12 0x00007f6a66731e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#13 0x0000563cf7b292d5 _start (./opt+0x71e2d5)
Segmentation fault (core dumped)

[dtcxzyw]

Oh, I forgot to tell you to specify target triple.

target triple = "x86_64-unknown-linux-gnu"
define i32 @a() { ret i32 0 }

It should work without crash.

[zhangxiaosa]

Yes, it does not crash this time. Thank you.