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https://issues.apache.org/jira/browse/ZOOKEEPER-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt reassigned ZOOKEEPER-2891:
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Assignee: Alexander A. Strelets
> SIGABRT from assert during fake completion on zookeeper_close.
> --------------------------------------------------------------
>
> Key: ZOOKEEPER-2891
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2891
> Project: ZooKeeper
> Issue Type: Bug
> Components: c client
> Affects Versions: 3.4.10
> Environment: Linux ubuntu 4.4.0-87-generic
> gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
> https://github.com/apache/zookeeper.git
> branch-3.4
> Reporter: Alexander A. Strelets
> Assignee: Alexander A. Strelets
> Priority: Critical
> Labels: easyfix
> Fix For: 3.4.10
>
>
> ZooKeeper C Client *+single thread+* build
> Function *_deserialize_multi()_* hits *_assert(entry)_* when called for the
> so called "Fake response" which is fabricated by the function
> _free_completions()_ for example when _zookeeper_close()_ is called while
> there is a pending _multi_ request.
> Such fake response includes only the header but zero bytes for the body. Due
> to this {{deserialize_MultiHeader(ia, "multiheader", &mhdr)}}, which is
> called repeatedly for each {{completion_list_t *entry =
> dequeue_completion(clist)}}, does not assign the _mhdr_ and keeps _mhdr.done
> == 0_ as it was originally initialized. Consequently the _while (!mhdr.done)_
> does not ever end, and finally falls into the _assert(entry)_ with _entry ==
> NULL_ when all sub-requests are "completed". ~// Normally on my platform
> assert raises SIGABRT.~
> I propose to instruct the _deserialize_multi()_ function to break the loop on
> _entry == NULL_ if it was called for an unsuccessfull overal status of the
> multi response, and in particular for the fake response having _ZCLOSING_
> (-116) status. I have introduced the _rc0_ parameter for this.
> *Another issue* with this function is that even if the while-loop exited
> properly, this function returns _rc == 0_, and this return code +overrides+
> the true status value with {{rc = deserialize_multi(xid, cptr, ia, rc)}} in
> the _deserialize_response()_ function. So, the _multi_ response callback
> +handler would be called with _rc == ZOK_ instead of _rc == ZCLOSING_+ which
> is strictly wrong.
> To fix this I propose initializing _rc_ with the introduced _rc0_ instead of
> zero (which is _ZOK_ indeed).
> This is a proposed fix: https://github.com/apache/zookeeper/pull/360
> [upd]
> It looks like about the same problem is described in ZOOKEEPER-1636
> However, the patch proposed in this ticket also remedies the second linked
> problem: reporting ZCLOSING status (as required) to the multi-request
> completion handler.
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