task: some bugfixs #810

Job	Run time
tests (vmm/sandbox, --all-features)	2m 56s
checks (vmm/sandbox, --all-features)	1m 23s
tests (vmm/task, --all-features)	2m 39s
checks (vmm/task, --all-features)	1m 4s
tests (shim, --all-features)	2m 40s
checks (shim, --all-features)	1m 23s
tests (quark, --all-features)	2m 32s
checks (quark, --all-features)	1m 13s
tests (runc, --all-features)	2m 43s
checks (runc, --all-features)	1m 22s
tests (wasm, --features=wasmedge, 0.11.2)	2m 47s
checks (wasm, --features=wasmedge, 0.11.2)	1m 14s
checks (wasm, --features=wasmtime)	1m 22s
tests (wasm, --features=wasmtime)	2m 57s
	28m 15s

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