The Node panic by assignment to entry in nil map

[galaio]

System information

Geth version: 1.5.2
OS & Version: Windows/Linux/OSX
Commit hash : 3a6ef6a

Expected behaviour

Node runs as normal.

Actual behaviour

The node panic.

Steps to reproduce the behaviour

Replacing the binary from v1.4.16 to v1.5.2-alpha, restart the node.

Backtrace

WARN [12-25|09:25:18.579] Option nousb is deprecated and USB is deactivated by default. Use --usb to enable
panic: assignment to entry in nil map

goroutine 4864 [running]:
github.com/ethereum/go-ethereum/triedb/pathdb.(*stateSet).merge(0xc010e02000, 0xc01905fa40)
	/home/runner/work/bsc/bsc/triedb/pathdb/states.go:219 +0x196
github.com/ethereum/go-ethereum/triedb/pathdb.(*buffer).commit(0xc010b24d60, 0xc0181d16c8?, 0xc01905fa40)
	/home/runner/work/bsc/bsc/triedb/pathdb/buffer.go:78 +0x3a
github.com/ethereum/go-ethereum/triedb/pathdb.(*nodecache).commit(...)
	/home/runner/work/bsc/bsc/triedb/pathdb/asyncnodebuffer.go:208
github.com/ethereum/go-ethereum/triedb/pathdb.(*asyncnodebuffer).commit(0xc02b39e930, 0xc016c018e0, 0xc01905fa40)
	/home/runner/work/bsc/bsc/triedb/pathdb/asyncnodebuffer.go:79 +0xa5
github.com/ethereum/go-ethereum/triedb/pathdb.(*diskLayer).commit(0xc000858380, 0xc016725700, 0x0)
	/home/runner/work/bsc/bsc/triedb/pathdb/disklayer.go:325 +0x1f5
github.com/ethereum/go-ethereum/triedb/pathdb.diffToDisk(0xc016725700, 0x0)
	/home/runner/work/bsc/bsc/triedb/pathdb/difflayer.go:359 +0x45
github.com/ethereum/go-ethereum/triedb/pathdb.(*diffLayer).persist(0xc016725700, 0x0)
	/home/runner/work/bsc/bsc/triedb/pathdb/difflayer.go:344 +0xad
github.com/ethereum/go-ethereum/triedb/pathdb.(*layerTree).cap(0xc010b24da0, {0xa4, 0x9f, 0x7e, 0xbc, 0xc8, 0xa5, 0x8c, 0x19, 0xc2, ...}, ...)
	/home/runner/work/bsc/bsc/triedb/pathdb/layertree.go:185 +0x925
github.com/ethereum/go-ethereum/triedb/pathdb.(*Database).Update(0xc01222d5e0, {0xa4, 0x9f, 0x7e, 0xbc, 0xc8, 0xa5, 0x8c, 0x19, 0xc2, ...}, ...)
	/home/runner/work/bsc/bsc/triedb/pathdb/database.go:318 +0x190
github.com/ethereum/go-ethereum/triedb.(*Database).Update(0xc9637d9cd9e758c9?, {0xa4, 0x9f, 0x7e, 0xbc, 0xc8, 0xa5, 0x8c, 0x19, 0xc2, ...}, ...)
	/home/runner/work/bsc/bsc/triedb/database.go:196 +0x115
github.com/ethereum/go-ethereum/core/state.(*StateDB).commitAndFlush(0xc00117ce00, 0x2ca17fe, 0x1?)
	/home/runner/work/bsc/bsc/core/state/statedb.go:1476 +0x5d2
github.com/ethereum/go-ethereum/core/state.(*StateDB).Commit(0xc01222bc80?, 0x2ca17fd?, 0x48?)
	/home/runner/work/bsc/bsc/core/state/statedb.go:1496 +0x1f
github.com/ethereum/go-ethereum/core.(*BlockChain).writeBlockWithState(0xc011fc8b08, 0xc015bf16b0, {0xc0194ce7a0, 0x4, 0x4}, 0xc00117ce00)
	/home/runner/work/bsc/bsc/core/blockchain.go:1794 +0x5f6
github.com/ethereum/go-ethereum/core.(*BlockChain).writeBlockAndSetHead(0xc011fc8b08, 0xc015bf16b0, {0xc0194ce7a0, 0x4, 0x4}, {0xc01479f380, 0xa, 0xc}, 0xc00117ce00, 0x0)
	/home/runner/work/bsc/bsc/core/blockchain.go:1913 +0x165
github.com/ethereum/go-ethereum/core.(*BlockChain).processBlock(0xc011fc8b08, 0xc015bf16b0, 0xc00117ce00, {0x0?, 0x3464850?, 0x4edfac0?}, 0x1, 0xc013f5d9d0)
	/home/runner/work/bsc/bsc/core/blockchain.go:2451 +0x106e
github.com/ethereum/go-ethereum/core.(*BlockChain).insertChain(0xc011fc8b08, {0xc0164f2008, 0x145, 0x25f}, 0x1, 0x0)
	/home/runner/work/bsc/bsc/core/blockchain.go:2261 +0x22e9
github.com/ethereum/go-ethereum/core.(*BlockChain).insertSideChain(0xc011fc8b08, 0x27?, 0xc0151fb998, 0x0)
	/home/runner/work/bsc/bsc/core/blockchain.go:2604 +0x20ce
github.com/ethereum/go-ethereum/core.(*BlockChain).insertChain(0xc011fc8b08, {0xc0149f9b50, 0x1, 0x1}, 0x1, 0x0)
	/home/runner/work/bsc/bsc/core/blockchain.go:2127 +0xd97
github.com/ethereum/go-ethereum/core.(*BlockChain).InsertChain(0xc011fc8b08, {0xc0149f9b50, 0x1, 0x1})
	/home/runner/work/bsc/bsc/core/blockchain.go:2011 +0xb39
github.com/ethereum/go-ethereum/eth/downloader.(*Downloader).importBlockResults(0xc010be4f00, {0xc0149f9b48, 0x1, 0x65c37e80cf52ebe8?})
	/home/runner/work/bsc/bsc/eth/downloader/downloader.go:1373 +0x6a4
github.com/ethereum/go-ethereum/eth/downloader.(*Downloader).processFullSyncContent(0xc010be4f00, 0x20307e7b359e80a1?, 0x8a?)
	/home/runner/work/bsc/bsc/eth/downloader/downloader.go:1342 +0xaf
github.com/ethereum/go-ethereum/eth/downloader.(*Downloader).syncWithPeer.func8()
	/home/runner/work/bsc/bsc/eth/downloader/downloader.go:595 +0x1f
github.com/ethereum/go-ethereum/eth/downloader.(*Downloader).spawnSync.func1()
	/home/runner/work/bsc/bsc/eth/downloader/downloader.go:608 +0x62
created by github.com/ethereum/go-ethereum/eth/downloader.(*Downloader).spawnSync in goroutine 4842
	/home/runner/work/bsc/bsc/eth/downloader/downloader.go:608 +0x6e
INFO [12-25|09:25:44.323] Starting pprof server                    addr=http://0.0.0.0:6060/debug/pprof

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