failing TestGetBlocksSequential test

[marten-seemann]

=== RUN   TestGetBlocksSequential
    blocks_test.go:83: one instance at a time, get blocks concurrently
panic: unaligned 64-bit atomic operation

goroutine 183 [running]:
runtime/internal/atomic.panicUnaligned()
	/opt/hostedtoolcache/go/1.16.4/x64/src/runtime/internal/atomic/unaligned.go:8 +0x2d
runtime/internal/atomic.Xadd64(0xa41715c, 0x1, 0x0, 0xa427d50, 0x7)
	/opt/hostedtoolcache/go/1.16.4/x64/src/runtime/internal/atomic/asm_386.s:107 +0x11
github.com/ipfs/go-bitswap/testnet.(*networkClient).SendMessage(0xa417140, 0x85b407c, 0xa4a6f18, 0xa427dd0, 0x7, 0x85b5fc0, 0xa810740, 0x836cf01, 0x85b12e4)
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/testnet/virtual.go:187 +0xa0
github.com/ipfs/go-bitswap/testnet.(*messagePasser).SendMsg(0xa801ae0, 0x85b407c, 0xa4a6f18, 0x85b5fc0, 0xa810740, 0x7, 0x85b3a94)
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/testnet/virtual.go:232 +0x51
github.com/ipfs/go-bitswap/messagequeue.(*MessageQueue).attemptSendAndRecovery(0xa522150, 0x85b5fc0, 0xa810740, 0xa5ef7ac)
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/messagequeue/messagequeue.go:217 +0x48
github.com/ipfs/go-bitswap/messagequeue.(*MessageQueue).sendMessage(0xa522150)
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/messagequeue/messagequeue.go:198 +0x9e
github.com/ipfs/go-bitswap/messagequeue.(*MessageQueue).runQueue(0xa522150)
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/messagequeue/messagequeue.go:108 +0xd9
created by github.com/ipfs/go-bitswap/messagequeue.(*MessageQueue).Startup
	/home/runner/go/pkg/mod/github.com/ipfs/go-bitswap@v0.1.8/messagequeue/messagequeue.go:94 +0x83
FAIL	github.com/ipfs/go-blockservice/test	0.010s
FAIL

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