Awaiting mainchain RPC warmup and EXCEPTION: NSt8ios_base7failureB5cxx11E

[Amiga500]

on Raspberry pi 4 - 4gb (using myNode bitcoin full node software)
I have installed elements-0.18.1.7
Linux myNode 5.4.35-v7l+ #1314 SMP Fri May 1 17:47:34 BST 2020 armv7l GNU/Linux
./elementsd
it's all synched but i have these two lines on logs.

init message: Awaiting mainchain RPC warmup -> why i have this log?
EXCEPTION: NSt8ios_base7failureB5cxx11E -> what cause this exception?

Thanks in advance!

Following logs:

2020-05-25T10:13:36Z UpdateTip: new best=c75e498f26a46f7cbb1a6289d6cf66bcd8787ea10a95e65b0e9fab72dcf80d7c height=828045 version=0x20000000 tx=1289537 date='2020-05-25T10:12:57Z' progress=1.000000 cache=3.0MiB(18973txo)
2020-05-25T10:14:25Z init message: Awaiting mainchain RPC warmup
2020-05-25T10:14:36Z UpdateTip: new best=8e7e6d0c2c92ac3d2842419fa08ffe58b15c6bb35ee041a0a6af1cc78c2acb5b height=828046 version=0x20000000 tx=1289538 date='2020-05-25T10:13:56Z' progress=1.000000 cache=3.0MiB(18973txo)
2020-05-25T10:14:38Z

---

EXCEPTION: NSt8ios_base7failureB5cxx11E
Invalid consensus parameter entry type: iostream error
bitcoin in ProcessMessages()

---

EXCEPTION: NSt8ios_base7failureB5cxx11E
Invalid consensus parameter entry type: iostream error
bitcoin in ProcessMessages()

2020-05-25T10:15:36Z UpdateTip: new best=b7322379a968e3953ebe15828ebc2c99707d710ebda5c428e8f5658654528cea height=828047 version=0x20000000 tx=1289541 date='2020-05-25T10:14:57Z' progress=1.000000 cache=3.0MiB(18975txo)
2020-05-25T10:16:25Z init message: Awaiting mainchain RPC warmup
2020-05-25T10:16:36Z Disconnecting outbound peer 20 for old chain, best known block =
2020-05-25T10:16:36Z UpdateTip: new best=c1c7f45dd85891b8536be5ff011b6338ba88ee884e7730b0ad388b96bb6fff50 height=828048 version=0x20000000 tx=1289542 date='2020-05-25T10:15:57Z' progress=1.000000 cache=3.0MiB(18975txo)
2020-05-25T10:16:38Z New outbound peer connected: version: 70015, blocks=828048, peer=22
2020-05-25T10:17:35Z UpdateTip: new best=2452c337da706afc89d98d9703c0db3d97fdc580892eb6c3574e0baac32be503 height=828049 version=0x20000000 tx=1289543 date='2020-05-25T10:16:58Z' progress=1.000000 cache=3.0MiB(18975txo)
2020-05-25T10:18:25Z init message: Awaiting mainchain RPC warmup
2020-05-25T10:18:37Z UpdateTip: new best=a40cc83d4ec412375679f2522cc9bcc26bf758976133c41c87653bbb62484df2 height=828050 version=0x20000000 tx=1289544 date='2020-05-25T10:17:58Z' progress=1.000000 cache=3.0MiB(18975txo)
2020-05-25T10:19:35Z UpdateTip: new best=57b79b6976b3d09efafefd23e051a552144fd752cfe0dfc0058ec46e6fd0c461 height=828051 version=0x20000000 tx=1289551 date='2020-05-25T10:18:57Z' progress=1.000000 cache=3.0MiB(18979txo)
2020-05-25T10:20:25Z init message: Awaiting mainchain RPC warmup
2020-05-25T10:20:37Z UpdateTip: new best=891f225ca90817813242ed172069174db11d133c649e5b5a244c71b38edb8fd0 height=828052 version=0x20000000 tx=1289554 date='2020-05-25T10:19:57Z' progress=1.000000 cache=3.0MiB(18979txo)

[stevenroose]

The mainchain rpc messages has been fixed in c5cb714 but is not released yet.

And the exception print is fixed upstream in Bitcoin Core but we didn't backport that yet. It's not harmful, just a message that should not have been printed.

[stevenroose]

Closing as c5cb714 is merged in master now.