Zcashd v5.1.0 wallet.cpp:4422 ... Assertion 'uResutlHeight = rewindHeight' failed

Technical Support
1

Hi guys!

I installed zcashd v5.1.0 on Linux Debian and It synchronized to 98%, now I have this error message when I try to run it: "zcashd: wallet/wallet.cpp:4422: int CWallet::ScanForWallettransactions(CBLockIndex *, bool, bool): Assertion ‘uResutlHeight = rewindHeight’ failed.

Can someone help me?

Thanks, Ale

2 Likes
2

Hello,
Thank you for the report. Is it possible to update to v5.2.0? This might require a -reindex otherwise to resolve.

3

Hi mdr0id!

How can I specify -reindex options? to zcashd or zcash-cli command?

Thanks, Ale

4

Please use: zcashd -reindex from command line. Please be aware this will cause the node to reindex, which will take quite a bit of time depending on your internet and machine resources.

5

After zcashd -reindex I have to download chain yet! No I have 0% chain… It’s horrible!!

Ale

6

Hello.
What do you say about

The same problem is easily reproducible.

Is it still worth solving by constantly calling -reindex and -rescan?

8

The alternative is to upgrade to v5.2.0. I personally run multiple nodes and many more for other internal operational reasons, so I understand your frustrations.

9

Sometimes the reindex and rescan are unfortunately part of getting the node back to a graceful state. In the future we hope to reduce the need to use this.

10

I am a noob on 5.2.0, and I have this problem. :confounded:

11

Hi,
If I understand you correctly you have built or downloaded zcashd v5.2.0 on a linux system and on the first sync you saw the above error?

1 Like
12

Yes. I followed the binary install instructions:
https://zcash.readthedocs.io/en/latest/rtd_pages/install_debian_bin_packages.html

13

What system resources(e.g. CPU, RAM, DISK, cloud or baremetal machine) are on the computer you are using to sync?

14

The machine specs were given in the original post:
https://github.com/zcash/zcash/issues/6148#issue-1362363027

except to mention that it’s running in a Proxmox VM.

15

Im syncing a fresh node on hp amd turion ii dual x2 with 6GB + lotta swap, letya know

16

If it is possible to increase your RAM on the VM to 16GB and try again?

17

I’ll get back to you. I have a long-running job that I don’t want to interrupt.

18

There was one “hiccup” that I suspect was caused by my running a Proxmox backup on the VM while the Zcash download was running. Zcash aborted at the time when Proxmox issued a “fsfreeze” via the qemu-guest-agent, which is installed in the Linux guest.

I restarted the Zcash daemon with the addition of -rescan and -reindex. It’s now at 2202-07-20 and coming along nicely.

I will update you when it either completes or fails.

Thanks.

19

WOOT! :tada: :zcash:
I have not personally used Proxmox but did check it out a bit for VM tooling. It (zcashd) “should” sync, but you might notice a slow down when it gets to more recent blocks from the past couple of months due to transaction load.
We have been able to sync newer ARM boards(e.g. RPi 4 and Odroid 8GB boards), but sometimes you will run into issues with swap space FWIW.

20

The blockchain successfully downloaded. I shut down zcashd, and I am taking a backup.
Thanks. Problem solved.

21

Nice!
Be mindful that chains created with a zcash.conf containing:

experimentalfeatures=1
lightwalletd=1
txindex=1
insightexplorer=1

Will differ from the default zcash.conf. Chains created from these flags should be considered a completely different backup as it will require a node to rescan etc.

1 Like