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CreateNewBlock: TestBlockValidity failed: time-too-far-ahead-of-mtp #6976

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Kidyeah408 opened this issue Nov 3, 2024 · 1 comment
Open

CreateNewBlock: TestBlockValidity failed: time-too-far-ahead-of-mtp #6976

Kidyeah408 opened this issue Nov 3, 2024 · 1 comment

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@Kidyeah408
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Describe the issue

When running Zcash in regtest mode, I encounter the error "CreateNewBlock: TestBlockValidity failed: time-too-far-ahead-of-mtp (code 16)" when generating a new block. How can I resolve this?

Can you reliably reproduce the issue?

If so, please list the steps to reproduce below:

  1. linc@DESKTOP-8UIJ4HT:~/zcash$ src/zcash-cli -datadir=/tmp/regtest-datadir generate 1
    error code: -1
    error message:
    CreateNewBlock: TestBlockValidity failed: time-too-far-ahead-of-mtp (code 16)

Expected behaviour

Actual behaviour + errors

CreateNewBlock: TestBlockValidity failed: time-too-far-ahead-of-mtp (code 16)

The version of Zcash you were using:

v5.10.0

Machine specs:

  • OS name + version:Ubuntu 22.04.5 LTS(WSL)
  • CPU:AMD Ryzen 7 5700G with Radeon Graphics 3.80 GHz
  • RAM:8GB
  • Disk size:
  • Disk Type (HD/SDD):
  • Linux kernel version (uname -a):
  • Compiler version (gcc --version):
  • Linker version (ld -v):
  • Assembler version (as --version):

Any extra information that might be useful in the debugging process.

2024-11-03T13:51:37.376839Z INFO main: CreateNewBlock: total size 1000 (excluding coinbase) txs: 0 fees: 0 sigops 100
2024-11-03T13:51:37.377203Z INFO main: SetChainPoolValues: Lockbox value is 0 at height 7
2024-11-03T13:51:37.377222Z ERROR main: ContextualCheckBlockHeader: block at height 7, timestamp 1730641897 is too far ahead of median-time-past, limit is 1730631435
2024-11-03T13:51:37.377250Z INFO main: keypool return 3

Do you have a backup of ~/.zcash directory and/or take a VM snapshot?

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@daira
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daira commented Nov 19, 2024 •
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This is due to a violation of the following block consensus rule:

For each block at block height 2 or greater on Mainnet, or block height 653606 or greater on Testnet, nTime
MUST be less than or equal to the median-time-past of that block plus 90 · 60 seconds.

Regtest mode is designed to be run from the RPC tests, which ensure they have a sufficiently up-to-date block chain by recreating one starting from a new genesis block if needed (and depending on the configured cache behaviour): https://github.com/zcash/zcash/blob/master/qa/rpc-tests/test_framework/util.py#L228

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@daira @Kidyeah408