[llvm-bugs] Issue 27016 in oss-fuzz: llvm:llvm-opt-fuzzer--x86_64-guard_widening: ASSERT: !isEmpty() && "Nothing selected"

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
CC: kcc at google.com, mascasa at google.com, jdevl... at apple.com, igm... at gmail.com, davg at google.com, mitchp at google.com, bigch... at gmail.com, eneyman at google.com, llvm-... at lists.llvm.org, jfb at chromium.org, v... at apple.com, mitch... at outlook.com, xpl... at gmail.com, akils... at apple.com 
Labels: ClusterFuzz Stability-Memory-AddressSanitizer Unreproducible Engine-libfuzzer OS-Linux Proj-llvm Reported-2020-11-06
Type: Bug

New issue 27016 by ClusterFuzz-External: llvm:llvm-opt-fuzzer--x86_64-guard_widening: ASSERT: !isEmpty() && "Nothing selected"
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27016

Detailed Report: https://oss-fuzz.com/testcase?key=5732244047265792

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

Crash Type: ASSERT
Crash Address: 
Crash State:
  !isEmpty() && "Nothing selected"
  llvm::IRMutationStrategy::mutate
  llvm::IRMutator::mutateModule
  
Sanitizer: address (ASAN)

Crash Revision: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&revision=202005250248

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5732244047265792

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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