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Fix races on Node.Up field by encapsulation#1178
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January 30, 2019 15:48
I not necessarily agree with the way we wait for event propagation. But I truly disagree with having duplicated giga comments.
The Node.Up field was accessed concurrently without "proper" locking. There was a lock on Network and that was used sometimes to access the field. Other times the locking was missed and we had a data race. For example: ethereum/go-ethereum#18464 The case above was solved, but there were still intermittent/hard to reproduce races. So let's solve the issue permanently. resolves: #1146
Making Node.Up field private in 13292ee broke TestHTTPNetwork and TestHTTPSnapshot. Because the default UnmarshalJSON does not handle unexported fields. Important: The fix is partial and not proper to my taste. But I cut scope as I think the fix may require a change to the current serialization format. New ticket: #1177
added 2 commits
January 31, 2019 13:09
It's a good patten to call `defer Unlock()` right after `Lock()` so (new) error cases won't miss to unlock. Let's get back to that pattern. The patten was abandoned in 85a79b3, while fixing a data race. That data race does not exist anymore, since the Node.Up field got hidden behind its own lock.
frncmx
changed the title
As unexported fields are not serialized.
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opened upstream: ethereum/go-ethereum#18976 |
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The Node.Up field was accessed concurrently without "proper" locking.
There was a lock on Network and that was used sometimes to access
the field. Other times the locking was missed and we had
a data race.