| Issue |
76431
|
| Summary |
opt-18 crash: LLVM ERROR: Instruction Combining did not reach a fixpoint after 1 iterations
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
iamanonymouscs
|
opt-18 crash at "Combine redundant instructions" when compiled with -fsanitize=address.
Compiler explorer: https://godbolt.org/z/r1esW5hcK
```
$cat mutant.c
char *a;
int **b;
int c;
void d() { a[c] = a[c] + b[0][c]; }
$clang-18 -fsanitize=address -O3 -mllvm -disable-llvm-optzns -c -emit-llvm mutant.c -o mutant.bc
$opt-18 -passes=instcombine mutant.bc -o mutant.opt.bc
LLVM ERROR: Instruction Combining did not reach a fixpoint after 1 iterations
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: opt-18 -passes=instcombine mutant.bc -o mutant.opt.bc
#0 0x00007fa3e181d266 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2b266)
#1 0x00007fa3e181b170 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd29170)
#2 0x00007fa3e181d940 (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xd2b940)
#3 0x00007fa3e08e5980 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12980)
#4 0x00007fa3dfaffe87 raise /build/glibc-CVJwZb/glibc-2.27/signal/../sysdeps/unix/sysv/linux/raise.c:51:0
#5 0x00007fa3dfb017f1 abort /build/glibc-CVJwZb/glibc-2.27/stdlib/abort.c:81:0
#6 0x00007fa3e1778cfc llvm::report_fatal_error(llvm::Twine const&, bool) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xc86cfc)
#7 0x00007fa3e2575f05 (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x1a83f05)
#8 0x00007fa3e257559f llvm::InstCombinePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x1a8359f)
#9 0x00007fa3e47f1add (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x3cffadd)
#10 0x00007fa3e1998b04 llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xea6b04)
#11 0x00007fa3e381dadd (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x2d2badd)
#12 0x00007fa3e199c311 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xeaa311)
#13 0x00007fa3e381d8fd (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0x2d2b8fd)
#14 0x00007fa3e1997864 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/usr/lib/llvm-18/bin/../lib/libLLVM-18.so.1+0xea5864)
#15 0x000055f9b6d079b9 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (/usr/lib/llvm-18/bin/opt+0x1d9b9)
#16 0x000055f9b6d148a4 main (/usr/lib/llvm-18/bin/opt+0x2a8a4)
#17 0x00007fa3dfae2c87 __libc_start_main /build/glibc-CVJwZb/glibc-2.27/csu/../csu/libc-start.c:344:0
#18 0x000055f9b6d0201a _start (/usr/lib/llvm-18/bin/opt+0x1801a)
Aborted (core dumped)
********************
```
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