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Posted to issues@zookeeper.apache.org by "Mate Szalay-Beko (Jira)" <ji...@apache.org> on 2020/07/31 14:48:00 UTC
[jira] [Resolved] (ZOOKEEPER-3885) zoo_aremove_watches segfault:
zk_hashtable needs locking!
[ https://issues.apache.org/jira/browse/ZOOKEEPER-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mate Szalay-Beko resolved ZOOKEEPER-3885.
-----------------------------------------
Fix Version/s: 3.7.0
3.5.9
3.6.2
Resolution: Fixed
Issue resolved by pull request 1403
[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
> Fix For: 3.6.2, 3.5.9, 3.7.0
>
> Time Spent: 1h 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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