2025 10 01 Testnet rollback and restart

Edit

As of 2025-10-02 11:40 UTC testnet is back online. The instructions below are no longer relevant. Nodes that haven't yet joined the cluster will need to update their shred version, download a snapshot, and start normally:

--expected-shred-version 41708 \

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This testnet restart is NOT urgent. Follow these instructions when you have time, but don't skip sleep or disrupt other plans for this.

Summary

Attribute	Value
Ledger tool version	v3.0.4
Validator version	Agave: v2.3.11 Frankendancer: v0.708.20306
Snapshot slot	361144648
Restart slot	361144649
Shred version	41708
Expected bank hash	4NuNyboT36pwwGJvMPZLreFqYpkbpBjX82nkt4AkJ9QT

Step 1. Stop the validator process if you haven't already

Step 2: Install the correct version of agave-ledger-tool

This is necessary to create the correct snapshot in step 3.

Build Agave v3.0.4. Build instructions are available here: https://docs.anza.xyz/cli/install#build-from-source

Confirm that agave-ledger-tool --version shows version v3.0.4

Step 3. Create snapshot

This command creates a snapshot but removes some activated feature gate accounts.

agave-ledger-tool --ledger <ledger-path> create-snapshot \
--incremental \
--snapshots <snapshot-path> \
--hard-fork 361144648 \
--deactivate-feature-gate \
    htsptAwi2yRoZH83SKaUXykeZGtZHgxkS2QwW1pssR8 \
    turbnbNRp22nwZCmgVVXFSshz7H7V23zMzQgA46YpmQ \
--enable-capitalization-change \
--  361144648 <snapshot-path>

The output should include this at (or near) the end:

    Successfully created snapshot for slot 361144649, hash 4NuNyboT36pwwGJvMPZLreFqYpkbpBjX82nkt4AkJ9QT, base slot: <BASE_SLOT>: /home/sol/ledger-snapshots/incremental-snapshot-<BASE_SLOT>-361144649-<SNAPSHOT_HASH>.tar.zst
    Capitalization change: -1907040 lamports
    Shred version: 41708

The capitalization change is expected because we deactivated a feature gate.

Note that each operator's snapshot file name may contain different base slot number and hash, but

• the bank hash should be 4NuNyboT36pwwGJvMPZLreFqYpkbpBjX82nkt4AkJ9QT
• the second slot number should be 361144649
• the shred version should be 41708

Once you have created a snapshot, move all the other snapshots to a backup directory, so your snapshot directory contains one full snapshot and one incremental snapshot. Note that the <BASE_SLOT> in these two filenames should match.

snapshot-<BASE_SLOT>-<BASE_SNAPSHOT_HASH>.tar.zst
incremental-snapshot-<BASE_SLOT>-361144649-<SNAPSHOT_HASH>.tar.zst

If you fail to create a snapshot, see the appendix for possible fixes.

Step 4: Install Restart Version

This is the version we want to use to restart the cluster.

Agave: agave-install init v2.3.11

Frankendancer: Install v0.708.20306

Step 5: Update startup config and start your validator

Agave

Add these arguments to your validator startup script:

--wait-for-supermajority 361144649 \
--expected-shred-version 41708 \
--expected-bank-hash 4NuNyboT36pwwGJvMPZLreFqYpkbpBjX82nkt4AkJ9QT \

As it starts, the validator will load the snapshot for slot 361144649 and wait for 80% of the stake to come online before producing/validating new blocks.

To confirm your restarted validator is correctly waiting for 80% stake, look for this periodic log message to confirm it is waiting:

INFO  solana_core::validator] Waiting for 80% of activated stake at slot 361144649 to be in gossip...

And if you have RPC enabled, ask it for the current slot:

solana --url http://127.0.0.1:8899 slot

Any number other than 361144649 means you did not complete the steps correctly.

Once started, you should see log entries for “active stake” visible in gossip and “waiting for 80% of stake” to be visible. You can track these to see how the stake progresses.

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Appendix (use this only if step 3 failed)

If you get an error like this:

Error: Slot 361144648 is not available

Or this:

Unable to process blockstore from starting slot <slot> to 361144648; the ending slot is less than the starting slot. The starting slot will be the latest snapshot slot, or genesis if the --no-snapshot flag is specified or if no snapshots are found.

Your snapshots directory contains a snapshot that is for a slot >361144648. If you also have a snapshot for slot <=361144648 then move snapshots for slots >361144648 to a backup directory and run the agave-ledger-tool command again. If you do not have a snapshot for slot <=361144648 then you will need to download a snapshot

If you successfully created a snapshot, resume the instructions above starting at Step 4. If you are unable to create a snapshot, follow the instructions below on downloading a snapshot.

If you could not produce your snapshot locally, follow these appendix steps

Step 1: Download a snapshot from a known validator

If you are unable to generate a snapshot locally for slot 361144649 you will need to download one from a known validator. Add these lines to your startup script.

--known-validator 5D1fNXzvv5NjV1ysLjirC4WY92RNsVH18vjmcszZd8on \
--expected-shred-version 41708 \

Remove the flag --no-snapshot-fetch in your startup script if it is present.

Step 2: After download, restart

Verify that you have a new snapshot in your snapshot directory. If the snapshot is done downloading, stop your validator process.

Add the flag --no-snapshot-fetch to your startup script

Resume the instructions above starting at Step 4.