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https://issues.apache.org/jira/browse/ZOOKEEPER-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157648#comment-17157648
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Tudor Bosman commented on ZOOKEEPER-3885:
-----------------------------------------
PR: https://github.com/apache/zookeeper/pull/1403
> zoo_aremove_watches segfault: zk_hashtable needs locking!
> ---------------------------------------------------------
>
> Key: ZOOKEEPER-3885
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3885
> Project: ZooKeeper
> Issue Type: Bug
> Components: c client
> Affects Versions: 3.6.1, 3.5.8
> Reporter: Tudor Bosman
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We're encountering the following segfault (stack abridged).
> This happens because the watcher hashtable has no locking, and is accessed
> concurrently from multiple threads:
> - the thread doing zoo_aremove_watches, and
> - the IO thread adding / firing watchers
> We encountered this with zookeeper 3.5.8, but by code inspection the code
> appears the same in 3.6.
> *** Aborted at 1594473472 (Unix time, try 'date -d @1594473472') ***
> *** Signal 11 (SIGSEGV) (0xae000000aa) received by PID 199 (pthread TID
> 0x7f1d64667700) (linux TID 1273) (code: address not mapped to object), stack
> trace: ***
> @ 00007f1d98dfc8b3 folly::symbolizer::(anonymous
> namespace)::signalHandler(int, siginfo_t*, void*)
>
> /src/folly/folly/experimental/symbolizer/SignalHandler.cpp:431
> @ 00007f1d95e6c89f (unknown)
> @ 00007f1d8f73de1e containsWatcher.part.3
>
> /src/zookeeper/zookeeper-client/zookeeper-client-c/src/zk_hashtable.c:152
> @ 00007f1d8f73e806 pathHasWatcher
>
> /src/zookeeper/zookeeper-client/zookeeper-client-c/src/zk_hashtable.c:456
> @ 00007f1d8f7382dd aremove_watches
>
> /src/zookeeper/zookeeper-client/zookeeper-client-c/src/zookeeper.c:4260
> @ 00007f1d8f738f82 zoo_aremove_watches
>
> /src/zookeeper/zookeeper-client/zookeeper-client-c/src/zookeeper.c:5131
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