[llvm-bugs] [Bug 46638] New: Crash in isValidAssumeForContext after lvmorg-11-init-19807-gcf1d9f9f49a

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46638

            Bug ID: 46638
           Summary: Crash in isValidAssumeForContext after
                    lvmorg-11-init-19807-gcf1d9f9f49a
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    nikita.ppv at gmail.com

Unfortunately the steps to reproduce are roughly "build Firefox with PGO and
LTO enabled for both C++ and Rust" which is an arduous process. Here's hoping
that maybe the bug can be found by inspection alone.

After
https://github.com/llvm/llvm-project/commit/cf1d9f9f49ae62ab4c7bb685d786a8daa7bc1d4a,
the following crash is seen:

> 0.	Running pass 'Function Pass Manager' on module '/home/vm/src/mc/obj-llvmorg-11-init-19841-g7356b4243ad/x86_64-unknown-linux-gnu/release/libgkrust_gtest.a(wgpu_bindings-00b8588e9f85c3f5.wgpu_bindings.cqanh8rg-cgu.0.rcgu.o at 12913238)'.
> 1.	Running pass 'Simplify the CFG' on function '@wgpu_server_device_create_bind_group_layout'
>  #0 0x00007f1e117e568a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x14df68a)
>  #1 0x00007f1e117e5964 SignalHandler(int) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x14df964)
>  #2 0x00007f1e12e113c0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x153c0)
>  #3 0x00007f1e1181c036 llvm::BasicBlock::getSinglePredecessor() const (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1516036)
>  #4 0x00007f1e12315d49 llvm::isValidAssumeForContext(llvm::Instruction const*, llvm::Instruction const*, llvm::DominatorTree const*) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x200fd49)
>  #5 0x00007f1e12251dfc SimplifyICmpInst(unsigned int, llvm::Value*, llvm::Value*, llvm::SimplifyQuery const&, unsigned int) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1f4bdfc)
>  #6 0x00007f1e122564b8 llvm::SimplifyInstruction(llvm::Instruction*, llvm::SimplifyQuery const&, llvm::OptimizationRemarkEmitter*) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1f504b8)
>  #7 0x00007f1e11e5b8e6 FoldCondBranchOnPHI(llvm::BranchInst*, llvm::DataLayout const&, llvm::AssumptionCache*) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1b558e6)
>  #8 0x00007f1e11e5753d (anonymous namespace)::SimplifyCFGOpt::simplifyCondBranch(llvm::BranchInst*, llvm::IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter>&) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1b5153d)
>  #9 0x00007f1e11e4dbca (anonymous namespace)::SimplifyCFGOpt::simplifyOnce(llvm::BasicBlock*) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1b47bca)
> #10 0x00007f1e11e4c9b5 llvm::simplifyCFG(llvm::BasicBlock*, llvm::TargetTransformInfo const&, llvm::SimplifyCFGOptions const&, llvm::SmallPtrSetImpl<llvm::BasicBlock*>*) (/home/vm/src/llvmorg-11-init-19807-gcf1d9f9f49a/bin/../lib/libLLVM-11git.so+0x1b469b5)

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