[llvm-bugs] Issue 4975 in oss-fuzz: llvm/llvm-isel-fuzzer--aarch64-gisel: ASSERT: !NodePtr->isKnownSentinel()

[ClusterFuzz-External via monorail via llvm-bugs]

Comment #4 on issue 4975 by ClusterFuzz-External:  
llvm/llvm-isel-fuzzer--aarch64-gisel: ASSERT: !NodePtr->isKnownSentinel()
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4975#c4

ClusterFuzz has detected this issue as fixed in range  
201801290646:201801300702.

Detailed report: https://oss-fuzz.com/testcase?key=6729802686922752

Project: llvm
Fuzzer: libFuzzer_llvm_llvm-isel-fuzzer--aarch64-gisel
Fuzz target binary: llvm-isel-fuzzer--aarch64-gisel
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: ASSERT
Crash Address:
Crash State:
   !NodePtr->isKnownSentinel()
   RegAllocFast::allocateBasicBlock
   RegAllocFast::runOnMachineFunction

Sanitizer: address (ASAN)

Regressed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201710121744:201710130152
Fixed:  
https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&range=201801290646:201801300702

Reproducer Testcase:  
https://oss-fuzz.com/download?testcase_id=6729802686922752

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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