[FUZZ] Beaconfuzz_v2 crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2 in struct_block

[Daft-Wullie]

I've done and provided the following:

• Checked to see if any other [FUZZ] issue already refers to that crasher
• Attached the crashing input (either attached to the issue as a .zip or .gz, or as a link to a file sharing service)
• Noted the beacon-fuzz version or commit used.
• Provided crash output
• Noted the command or fuzzer used to generate the crash
• Name of the original crash file
• (Optional but optimal) Checked if the crash can be consistently replicated by re-running the input.

Info to Reproduce

• Command run: e.g. make fuzz_block-struct

• Crasher file name: crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2
  crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2.zip

• Client exercised: (nimbus?)

• Fuzzing engine used (if applicable): libfuzzer

Crash output and stacktrace

thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `false`,
 right: `true`', /home/beacon-fuzz/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs:30:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last, using override)
/home/nim-beacon-chain/vendor/nimbus-build-system/vendor/Nim/lib/system/excpt.nim(614) signalHandler
SIGABRT: Abnormal termination.
==10062== ERROR: libFuzzer: fuzz target exited
    #0 0x5587ea66c901  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xb99901)
    #1 0x5587ecafecc0  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x302bcc0)
    #2 0x5587ecb13a2b  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x3040a2b)
    #3 0x7f266c448a26  (/lib/x86_64-linux-gnu/libc.so.6+0x49a26)
    #4 0x7f266c448bdf  (/lib/x86_64-linux-gnu/libc.so.6+0x49bdf)
    #5 0x5587ea8ca11c  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xdf711c)
    #6 0x7f266c44520f  (/lib/x86_64-linux-gnu/libc.so.6+0x4620f)
    #7 0x7f266c44518a  (/lib/x86_64-linux-gnu/libc.so.6+0x4618a)
    #8 0x7f266c424858  (/lib/x86_64-linux-gnu/libc.so.6+0x25858)
    #9 0x5587ecbc58a6  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30f28a6)
    #10 0x5587ecbaeb95  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30dbb95)
    #11 0x5587ecaf2206  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x301f206)
    #12 0x5587ecbb5dd7  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30e2dd7)
    #13 0x5587ecbb5988  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30e2988)
    #14 0x5587ecbb0e6b  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30dde6b)
    #15 0x5587ecbb5948  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30e2948)
    #16 0x5587ecbb58fa  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30e28fa)
    #17 0x5587ea7b005d  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xcdd05d)
    #18 0x5587ea73f00c  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xc6c00c)
    #19 0x5587ecaf2230  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x301f230)
    #20 0x5587ecaf1e8f  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x301ee8f)
    #21 0x5587ecb13e8c  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x3040e8c)
    #22 0x5587ecb1c040  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x3049040)
    #23 0x5587ecb1c9fc  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30499fc)
    #24 0x5587ecb1edff  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x304bdff)
    #25 0x5587ecaf03d9  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x301d3d9)
    #26 0x5587ea5e94b6  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xb164b6)
    #27 0x7f266c4260b2  (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #28 0x5587ea5e965d  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xb1665d)

SUMMARY: libFuzzer: fuzz target exited
MS: 2 ShuffleBytes-CrossOver-; base unit: adc83b19e793491b1c6ea0fd8b46cd9f32e592fc
0x0,0x43,0x43,0x43,0xa,0xa,0x0,0x0,0x0,0xff,0xff,0xa,0xff,0xff,0xa,0xa,0xff,0xa,0x11,0xa,0xa,0x11,0xa,0xa,0x11,0x11,0x11,0x11,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0xa,0x0,0xa,0xa,0x0,0x0,0x0,0xa,0x0,0x0,0x0,0x0,0x0,
\x00CCC\x0a\x0a\x00\x00\x00\xff\xff\x0a\xff\xff\x0a\x0a\xff\x0a\x11\x0a\x0a\x11\x0a\x0a\x11\x11\x11\x11\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x0a\x00\x0a\x0a\x00\x00\x00\x0a\x00\x00\x00\x00\x00
artifact_prefix='/home/beacon-fuzz/beaconfuzz_v2/fuzz/artifacts/struct_block/'; Test unit written to /home/beacon-fuzz/beaconfuzz_v2/fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2
Base64: AENDQwoKAAAA//8K//8KCv8KEQoKEQoKEREREQoKCgoKCgoKCgoKCgoKCgoKCgAKCgAAAAoAAAAAAA==

────────────────────────────────────────────────────────────────────────────────

Failing input:

        fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2

Output of `std::fmt::Debug`:

        SignedBeaconBlock {
            message: BeaconBlock {
                slot: Slot(11039194432256),
                proposer_index: 723672161012678400,
                parent_root: 0xff0a110a0a110a0a111111110a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a0a000a,
                state_root: 0x0a0000000a000000000000000000000000000000000000000000000000000000,
                body: BeaconBlockBody {
                    randao_reveal: 0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
                    eth1_data: Eth1Data {
                        deposit_root: 0x0000000000000000000000000000000000000000000000000000000000000000,
                        deposit_count: 0,
                        block_hash: 0x0000000000000000000000000000000000000000000000000000000000000000,
                    },
                    graffiti: [
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                        0,
                    ],
                    proposer_slashings: VariableList {
                        vec: [],
                        _phantom: PhantomData,
                    },
                    attester_slashings: VariableList {
                        vec: [],
                        _phantom: PhantomData,
                    },
                    attestations: VariableList {
                        vec: [],
                        _phantom: PhantomData,
                    },
                    deposits: VariableList {
                        vec: [],
                        _phantom: PhantomData,
                    },
                    voluntary_exits: VariableList {
                        vec: [],
                        _phantom: PhantomData,
                    },
                },
            },
            signature: 0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000,
        }

Reproduce with:

        cargo fuzz run struct_block fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2

Minimize test case with:

        cargo fuzz tmin struct_block fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2

────────────────────────────────────────────────────────────────────────────────

Error: Fuzz target exited with exit code: 77

command used to reproduce: ETH2FUZZ_BEACONSTATE=../eth2fuzz/workspace/corpora/beaconstate cargo +nightly fuzz run struct_block fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2

    Finished release [optimized] target(s) in 0.29s
     Running `fuzz/target/x86_64-unknown-linux-gnu/release/struct_block -artifact_prefix=/home/beacon-fuzz/beaconfuzz_v2/fuzz/artifacts/struct_block/ fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2`
INFO: Seed: 4036764528
INFO: Loaded 1 modules   (203653 inline 8-bit counters): 203653 [0x5602f6bd6461, 0x5602f6c07fe6),
INFO: Loaded 1 PC tables (203653 PCs): 203653 [0x5602f6c07fe8,0x5602f6f23838),
fuzz/target/x86_64-unknown-linux-gnu/release/struct_block: Running 1 inputs 1 time(s) each.
Running: fuzz/artifacts/struct_block/crash-b22ce997bf58f944a6b96aff5ffb3673e3ec75c2
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Could not get rough time result: no reply     prefix=roughtime
ERRO[0018] Failed to calculate roughtime offset          error="no valid responses" prefix=roughtime
thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `false`,
 right: `true`', /home/beacon-fuzz/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs:30:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last, using override)
/home/nim-beacon-chain/vendor/nimbus-build-system/vendor/Nim/lib/system/excpt.nim(614) signalHandler
SIGABRT: Abnormal termination.
==11756== ERROR: libFuzzer: fuzz target exited
    #0 0x5602f3529901  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xc18901)
    #1 0x5602f5a0c430  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30fb430)
    #2 0x5602f5a2119b  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x311019b)
    #3 0x7ff152035a26  (/lib/x86_64-linux-gnu/libc.so.6+0x49a26)
    #4 0x7ff152035bdf  (/lib/x86_64-linux-gnu/libc.so.6+0x49bdf)
    #5 0x5602f378fc2c  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xe7ec2c)
    #6 0x7ff15203220f  (/lib/x86_64-linux-gnu/libc.so.6+0x4620f)
    #7 0x7ff15203218a  (/lib/x86_64-linux-gnu/libc.so.6+0x4618a)
    #8 0x7ff152011858  (/lib/x86_64-linux-gnu/libc.so.6+0x25858)
    #9 0x5602f5ad32c6  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31c22c6)
    #10 0x5602f5abc5b5  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31ab5b5)
    #11 0x5602f59ff976  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30ee976)
    #12 0x5602f5ac37f7  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31b27f7)
    #13 0x5602f5ac33a8  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31b23a8)
    #14 0x5602f5abe88b  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31ad88b)
    #15 0x5602f5ac3368  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31b2368)
    #16 0x5602f5ac331a  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31b231a)
    #17 0x5602f367158d  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xd6058d)
    #18 0x5602f35feaa3  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xcedaa3)
    #19 0x5602f59ff9a0  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30ee9a0)
    #20 0x5602f59ff5ff  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30ee5ff)
    #21 0x5602f5a215fc  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x31105fc)
    #22 0x5602f59f2709  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30e1709)
    #23 0x5602f59fc502  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0x30eb502)
    #24 0x5602f34a64b6  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xb954b6)
    #25 0x7ff1520130b2  (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #26 0x5602f34a665d  (/home/beacon-fuzz/beaconfuzz_v2/fuzz/target/x86_64-unknown-linux-gnu/release/struct_block+0xb9565d)

SUMMARY: libFuzzer: fuzz target exited
────────────────────────────────────────────────────────────────────────────────

Error: Fuzz target exited with exit code: 77

Your Environment

• Fuzzer ran: beaconfuzz_v2
• Version/Commit used: 9404192
• Operating System and version: Ubuntu 20.04

[zedt3ster]

It looks like this might be an issue with the block fuzzer itself - @pventuzelo is investigating and should be able to confirm shortly.

[pventuzelo]

Thanks for the report @Daft-Wullie ;)

It's an issue in the fuzzer actually, the lighthouse harness was not returning an error in certain cases.
I fixed it in 3d0d06c

Thanks ;)