[llvm-bugs] Issue 23158 in oss-fuzz: llvm:clangd-fuzzer: Sanitizer CHECK failure in "(("unable to unmap" && 0)) != (0)" (0x0, 0x0)

[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-2020-06-07
Type: Bug

New issue 23158 by ClusterFuzz-External: llvm:clangd-fuzzer: Sanitizer CHECK failure in "(("unable to unmap" && 0)) != (0)" (0x0, 0x0)
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=23158

Detailed Report: https://oss-fuzz.com/testcase?key=5752812746309632

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

Crash Type: Sanitizer CHECK failure
Crash Address: 
Crash State:
  "(("unable to unmap" && 0)) != (0)" (0x0, 0x0)
  
Sanitizer: address (ASAN)

Crash Revision: https://oss-fuzz.com/revisions?job=libfuzzer_asan_llvm&revision=202005180726

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5752812746309632

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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