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If memdb has only 1 node and it is attempted to be closed with concurrency=2, then the following crash occurs:

panic: runtime error: invalid memory address or nil pointer dereference [recovered]

	panic: runtime error: invalid memory address or nil pointer dereference

[signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xa4bcbd]goroutine 38 [running]:

github.com/couchbase/indexing/secondary/memdb.(*Item).Bytes(...)

	/home/akhilmd/projects/couchbase-neo/goproj/src/github.com/couchbase/indexing/secondary/memdb/item.go:116

github.com/couchbase/indexing/secondary/memdb.(*MemDB).FreeNodesConcurrent(0xc000320780, 0x2, 0x0, 0x0)

	/home/akhilmd/projects/couchbase-neo/goproj/src/github.com/couchbase/indexing/secondary/memdb/memdb.go:674 +0xa5d

github.com/couchbase/indexing/secondary/memdb.(*MemDB).Close2(0xc000320780, 0x2)

	/home/akhilmd/projects/couchbase-neo/goproj/src/github.com/couchbase/indexing/secondary/memdb/memdb.go:603 +0x4ae

is a backport of

MB-49518 Crash in memdb.Close if items_count=1 and concurrency=2

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[BP-7.0.4 MB-49518] - Crash in memdb.Close if items_count=1 and concurrency=2