[llvm-bugs] Issue 44073 in oss-fuzz: llvm:llvm-isel-fuzzer--x86_64-O2: Direct-leak in llvm::BitcodeReaderValueList::getValueFwdRef

[ClusterFuzz-External via monorail via llvm-bugs]

Status: New
Owner: ----
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Labels: ClusterFuzz Stability-Memory-AddressSanitizer Stability-Memory-LeakSanitizer Unreproducible Engine-libfuzzer OS-Linux Proj-llvm Reported-2022-01-26
Type: Bug

New issue 44073 by ClusterFuzz-External: llvm:llvm-isel-fuzzer--x86_64-O2: Direct-leak in llvm::BitcodeReaderValueList::getValueFwdRef
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=44073

Detailed Report: https://oss-fuzz.com/testcase?key=6118194856067072

Project: llvm
Fuzzing Engine: libFuzzer
Fuzz Target: llvm-isel-fuzzer--x86_64-O2
Job Type: libfuzzer_asan_llvm
Platform Id: linux

Crash Type: Direct-leak
Crash Address: 
Crash State:
  llvm::BitcodeReaderValueList::getValueFwdRef
  BitcodeReader::parseFunctionBody
  BitcodeReader::materialize
  
Sanitizer: address (ASAN)

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

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=6118194856067072

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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