[llvm-bugs] Issue 25717 in oss-fuzz: llvm:llvm-opt-fuzzer--x86_64-instcombine: ASSERT: isa<X>(Val) && "cast<Ty>() argument of incompatible type!"

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Unreproducible Engine-libfuzzer OS-Linux Proj-llvm Reported-2020-09-17
Type: Bug

New issue 25717 by ClusterFuzz-External: llvm:llvm-opt-fuzzer--x86_64-instcombine: ASSERT: isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25717

Detailed Report: https://oss-fuzz.com/testcase?key=6574019162931200

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-opt-fuzzer--x86_64-instcombine
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: ASSERT
Crash Address: 
Crash State:
  isa<X>(Val) && "cast<Ty>() argument of incompatible type!"
  std::__1::__function::__func<validShuffleVectorIndex
  llvm::RandomIRBuilder::newSource
  
Sanitizer: address (ASAN)

Crash Revision: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&revision=202006240154

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=6574019162931200

Issue filed automatically.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally.

************************* UNREPRODUCIBLE *************************
Note: This crash might not be reproducible with the provided testcase. That said, for the past 14 days, we've been seeing this crash frequently.

It may be possible to reproduce by trying the following options:
- Run testcase multiple times for a longer duration.
- Run fuzzing without testcase argument to hit the same crash signature.

If it still does not reproduce, try a speculative fix based on the crash stacktrace and verify if it works by looking at the crash statistics in the report. We will auto-close the bug if the crash is not seen for 14 days.
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