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c377e0a9e3
All the places the qp-trie code was using `call_rcu()` needed `__tsan_release()` and `__tsan_acquire()` annotations, so add a couple of wrappers to encapsulate this pattern. With these wrappers, the tests run almost clean under thread sanitizer. The remaining problems are due to `rcu_barrier()` which can be suppressed using `.tsan-suppress`. It does not suppress the whole of `liburcu`, because we would like thread sanitizer to detect problems in `call_rcu()` callbacks, which are called from `liburcu`. The CI jobs have been updated to use `.tsan-suppress` by default, except for a special-case job that needs the additional suppressions in `.tsan-suppress-extra`. We might be able to get rid of some of this after liburcu gains support for thread sanitizer. Note: the `rcu_barrier()` suppression is not entirely effective: tsan sometimes reports races that originate inside `rcu_barrier()` but tsan has discarded the stack so it does not have the information required to suppress the report. These "races" can be made much easier to reproduce by adding `atexit_sleep_ms=1000` to `TSAN_OPTIONS`. The problem with tsan's short memory can be addressed by increasing `history_size`: when it is large enough (6 or 7) the `rcu_barrier()` stack usually survives long enough for suppression to work. |
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| check | ||
| confgen | ||
| delv | ||
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| named | ||
| nsupdate | ||
| plugins | ||
| rndc | ||
| tests | ||
| tools | ||
| Makefile.am | ||