rpc: Fix data race (UB) in InterruptRPC() #14993

pull practicalswift wants to merge 1 commits into bitcoin:master from practicalswift:rpc-datarace changing 2 files +4 −7

practicalswift commented at 11:50 AM on December 18, 2018: contributor

Fix data race (UB) in InterruptRPC().

Before:

$ ./configure --with-sanitizers=thread
$ make
$ test/functional/test_runner.py feature_shutdown.py
…
SUMMARY: ThreadSanitizer: data race rpc/server.cpp:314 in InterruptRPC()
…
ALL                 | ✖ Failed  | 2 s (accumulated)

After:

$ ./configure --with-sanitizers=thread
$ make
$ test/functional/test_runner.py feature_shutdown.py
…
ALL                 | ✓ Passed  | 3 s (accumulated)

fanquake added the label RPC/REST/ZMQ on Dec 18, 2018
laanwj commented at 1:56 PM on December 18, 2018: member

utACK 10f8244a777392f87c2671d743b14201d24351be

I don't think this can actually result in a data race but an atomic is certainly more appropriate here.
in src/rpc/server.cpp:27 in 10f8244a77 outdated
```
  23 | @@ -24,7 +24,7 @@
  24 |  #include <unordered_map>
  25 |  
  26 |  static CCriticalSection cs_rpcWarmup;
  27 | -static bool fRPCRunning = false;
  28 | +static std::atomic<bool> fRPCRunning{false};
```
promag commented at 2:36 PM on December 18, 2018:

This is the only change needed, why the other changes when there's assign and cast operators?

MarcoFalke commented at 5:36 PM on December 18, 2018:

Could rename to g_rpc_running to clarify that it is a global?
practicalswift force-pushed on Dec 18, 2018
promag commented at 2:57 PM on December 18, 2018: member

utACK 9ed8713.
MarcoFalke commented at 5:37 PM on December 18, 2018: member

Remove from the suppressions file?
practicalswift force-pushed on Dec 18, 2018
rpc: Fix data race (UB) in InterruptRPC() 6c10037f72
practicalswift force-pushed on Dec 18, 2018
practicalswift commented at 5:52 PM on December 18, 2018: contributor

@MarcoFalke Done! Please re-review :-)
promag commented at 8:18 PM on December 18, 2018: member

utACK 6c10037.
laanwj merged this on Dec 19, 2018
laanwj closed this on Dec 19, 2018
laanwj referenced this in commit cb52cee29d on Dec 19, 2018
Sjors commented at 2:35 PM on December 21, 2018: member

I'm still getting feature_shutdown.py failures on Travis, see e.g. https://travis-ci.org/bitcoin/bitcoin/jobs/470997593#L3104
promag commented at 3:34 PM on December 21, 2018: member

@Sjors that's fixed by #14958 which depends on #14982.
markblundeberg commented at 9:45 AM on February 6, 2020: none

(introduced in #14670)
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