IBD: BlockInvalid: no such block

[piotrnar]

Occasionally during IBD it gets stuck with a series of messages like below.
It happens very rarely - needs investigating.

Likely has something to do wit a valid block hash getting discarded, for some strange reason.
May be that a peer sends a bad payload and something gets wrong around this check in client/network/data.go:
if b2g.Block.MerkleRootMatch() && !strings.Contains(er.Error(), "RPC_Result:bad-witness-nonce-size") {

BlockInvalid: no such block 000000000000000000014011a4b134a0a5b6d5f9103613c31cbe985cfdb9ad5a
BlockInvalid: no such block 00000000000000000000a281d5b15a5a593d3fc400e85b4df6d70da65e84dee3
BlockInvalid: no such block 0000000000000000000026926fcc3e25465ee95502fe28f450be6d91c2a72794
BlockInvalid: no such block 000000000000000000017bd1fd4a47db5ee752ed645fbf16b8dbeea710f51a0a
BlockInvalid: no such block 000000000000000000014cca1a3d7f44f2dc7962c8d00a09e161e1da955b688d
BlockInvalid: no such block 000000000000000000002a7c6b0eace265e7e2a1c70fb0385a9213f563d95f20
BlockInvalid: no such block 00000000000000000001dfae963e6849bf3215fd49d7e8e90a9939f1fa7b4591
BlockInvalid: no such block 0000000000000000000084d5ddbe94bf1de7e102b295d7782e46d238dd1fc66c
BlockInvalid: no such block 00000000000000000000bb5bb0dee65145ae16bf654b8b15ab17e5cf50f82f72
BlockInvalid: no such block 0000000000000000000116496e8fa1a5853d3f073f9ef5f30497adb6c881e112
BlockInvalid: no such block 000000000000000000011f6989a84603c6c1cb80cefdb9d987a340180b5db0b4
BlockInvalid: no such block 000000000000000000010827116cf18f4431265213f329c8f3f88abbbc0d0179
BlockInvalid: no such block 00000000000000000001160c3d0403a6ab2599c9828e4ea35b13bfe77005d121
BlockInvalid: no such block 00000000000000000000879d4776e12c86cf1733f018279433a0d151efcdbef8
BlockInvalid: no such block 000000000000000000012c5edd777d62c9cd6472ddd234c3fd11397420a27666
BlockInvalid: no such block 00000000000000000000056a6dce5efd4db53f9440d28ee020d5cfb15b3a1c78
BlockInvalid: no such block 00000000000000000001197c73d449d48443acbcbee6666219c8f7368ee98051
BlockInvalid: no such block 00000000000000000000cb83c0404b6fcab81d553295ff298e612838248a0da1
BlockInvalid: no such block 000000000000000000005750510ecb5d43255ad2b03148cfa70cdcde262d92b7
BlockInvalid: no such block 00000000000000000000b131221131182fa267f66ef3fcd8efd096115dd96e2c
BlockInvalid: no such block 00000000000000000001809ecc45544926a470ca36a4f437e54ad464b4adf49a
BlockInvalid: no such block 00000000000000000001b5f43c2b73fb231b26cd14d069c7fc82b3081e7c92a0

[piotrnar]

Limiting number of "BlockInvalid: no such block" debugs to 10 and displaying a callstack after - change in lib/chain/blockdb.go to investigate.