Bug 1826258 Comment 3 Edit History

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on 
https://hg.mozilla.org/mozilla-central/file/9a0019f8494d122b7a149346b08644464d71cfc6/netwerk/dns/nsHostResolver.cpp#l1780

https://searchfox.org/mozilla-central/rev/bf87e869ece2406e9e425a74e8bf77aba0975625/netwerk/dns/nsHostResolver.cpp#1784
```cpp
if (NS_FAILED(status) && rs.Reset()) {
```

https://searchfox.org/mozilla-central/rev/bf87e869ece2406e9e425a74e8bf77aba0975625/netwerk/dns/nsHostResolver.cpp#113-124
```cpp
bool Reset() {
  // reset no more than once per second
  if (PR_IntervalToSeconds(PR_IntervalNow() - mLastReset) < 1) {
    return false;
  }

  mLastReset = PR_IntervalNow();
  auto result = res_ninit(&_res);

  LOG(("nsResState::Reset() > 'res_ninit' returned %d", result));
  return (result == 0);
}
```

So there's a race on either mLastReset or _res

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