[
https://issues.apache.org/jira/browse/ZOOKEEPER-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tudor Bosman updated ZOOKEEPER-3885:
------------------------------------
Description:
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.
{{*** 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}}
was:
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.
```
*** 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
```
> 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
>
> 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.
> {{*** 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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