[llvm-bugs] Issue 13206 in oss-fuzz: llvm/llvm-isel-fuzzer--x86_64-O2: ASSERT: MRI->getVRegDef(reg) && "Register use before def!"

[ClusterFuzz-External via monorail via llvm-bugs]

Comment #2 on issue 13206 by ClusterFuzz-External:  
llvm/llvm-isel-fuzzer--x86_64-O2: ASSERT: MRI->getVRegDef(reg) && "Register  
use before def!"
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13206#c2

ClusterFuzz has detected this issue as fixed in range  
201903110335:201903120333.

Detailed report: https://oss-fuzz.com/testcase?key=5759237538447360

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-isel-fuzzer--x86_64-O2
Fuzz target binary: llvm-isel-fuzzer--x86_64-O2
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: ASSERT
Crash Address:
Crash State:
   MRI->getVRegDef(reg) && "Register use before def!"
   llvm::LiveVariables::HandleVirtRegUse
   llvm::LiveVariables::runOnInstr

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201902180416:201902190429
Fixed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201903110335:201903120333

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5759237538447360

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
instructions to reproduce this bug locally.

If you suspect that the result above is incorrect, try re-doing that job on  
the test case report page.

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