[llvm-bugs] Issue 4729 in oss-fuzz: llvm/llvm-opt-fuzzer--x86_64-instcombine: ASSERT: !isNonNegative() && "Can't make a non-negative value negative"

[ClusterFuzz-External via monorail via llvm-bugs]

Comment #2 on issue 4729 by ClusterFuzz-External:  
llvm/llvm-opt-fuzzer--x86_64-instcombine: ASSERT: !isNonNegative()  
&& "Can't make a non-negative value negative"
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4729#c2

ClusterFuzz has detected this issue as fixed in range  
201712280611:201712282031.

Detailed report: https://oss-fuzz.com/testcase?key=5896781238894592

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

Crash Type: ASSERT
Crash Address:
Crash State:
   !isNonNegative() && "Can't make a non-negative value negative"
   llvm::KnownBits::makeNegative
   computeKnownBitsFromAssume

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201712190608:201712210617
Fixed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201712280611:201712282031

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=5896781238894592

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for  
more information.

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

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