les: clean up resources during test #22707
Merged
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The tests fail a lot, e..g on appveyor. Example: https://ci.appveyor.com/project/ethereum/go-ethereum/builds/38784182/job/5so0ap0l4d3al810
It appears that a lot of goroutines are leaked. Just by running
TestReceiptsAccessLes3
, I got the dump below after doing the teardown.THe changes in this PR might be doable more nicely, but I'm not really that well versed about how les works under the hood, so I just made the simplest changes I could find which "fixed" it.
After this PR, the corresponding stack dump is :