Abrt on unknown address (OSS-Fuzz 884)

[nlohmann]

Detailed report: https://oss-fuzz.com/testcase?key=5315478471835648

Project: json
Fuzzer: afl_json_parse_msgpack_fuzzer
Fuzz target binary: parse_msgpack_fuzzer
Job Type: afl_asan_json
Platform Id: linux

Crash Type: Abrt on unknown address 0x000000000001
Crash Address: 
Crash State:
  _start
  
Sanitizer: address (ASAN)

Reproducer Testcase: https://oss-fuzz.com/download/AMIfv96fkf9AwXKy-wXbV61t7B0JC38mg5zA4-rUOl-zRwncgV-WS83ugg7RnDc0TfzXL31HJbzmOk_qUOXy3YNOKytZU_avhvk8gH6o0GGeRczjdEO8DEwn2ha8HFU09-9Fw-Hh9ekhRlfTNOmIsSnleZYWEymX-eldkHDGnjwJyh4UDaQEcWgFtYb7kkssT4H-uA42bQpkauB4PsOG6NECCcpstleKoNAMMBPrsIiicvKPtn8CGF6SuilJXlkzZ3zAUwGdYA00m6ibSBMffRlbRjOKNq0T3rkW6r3cGn2mEOj2WQ_c4kzGvOZOXtgUA3F8bCLAXeBdSX2m6l2dcH5dS26wuHE3ZDDxpEYAXNxS0eiWPbeIlOPFwmTDhovUqXV7WEn8_mgvj4XjQC-6CakOaIBB9hawxcNBsArk4ZGi5U-ljMdW7jM?testcase_id=5315478471835648


Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for more information.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without an upstream patch, then the bug report will automatically
become visible to the public.

[Environment] ASAN_OPTIONS = redzone=32:handle_sigill=1:strict_string_check=1:allocator_release_to_os_interval_ms=500:strict_memcmp=1:detect_container_overflow=1:coverage=0:allocator_may_return_null=1:use_sigaltstack=1:detect_stack_use_after_return=1:alloc_dealloc_mismatch=0:detect_leaks=1:print_scariness=1:strip_path_prefix=/workspace/:max_uar_stack_size_log=16:handle_abort=1:check_malloc_usable_size=0:quarantine_size_mb=10:detect_odr_violation=0:symbolize=0:handle_segv=1:fast_unwind_on_fatal=0
[Environment] LSAN_OPTIONS = symbolize=1:external_symbolizer_path=/mnt/scratch0/clusterfuzz/scripts/linux/llvm-symbolizer
parse_msgpack_fuzzer: src/fuzzer-parse_msgpack.cpp:45: int LLVMFuzzerTestOneInput(const uint8_t *, size_t): Assertion `j1 == j2 failed.
ASAN:DEADLYSIGNAL
=================================================================
==1==ERROR: AddressSanitizer: ABRT on unknown address 0x000000000001 (pc 0x7f1ba631e418 bp 0x0000005b6a80 sp 0x7ffc3cb95148 T0)
SCARINESS: 10 (signal)
#0 0x7f1ba631e417 in gsignal
#1 0x7f1ba6320019 in abort
#2 0x7f1ba6316bd6 in libc.so.6
#3 0x7f1ba6316c81 in __assert_fail
#4 0x512b27 in LLVMFuzzerTestOneInput /src/json/test/src/fuzzer-parse_msgpack.cpp:45:13
#5 0x5122e3 in main /src/libfuzzer/afl/afl_driver.cpp:287:7
#6 0x7f1ba630982f in __libc_start_main
#7 0x41b588 in _start
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: ABRT (/lib/x86_64-linux-gnu/libc.so.6+0x35417)
==1==ABORTING

clusterfuzz-testcase-5315478471835648.zip

[nlohmann]

This seems to be the same reason as #516: comparison of NaN.