http://www.couchbase.com/issues This file is an XML representation of an issue en-us 5.2.4 845 26-12-2012 http://www.couchbase.com/issues/browse/CCBC-147 Couchbase C client library libcouchbase Start server with one node. <br/> Create many buckets, that uses all allowed memory -&gt; Server have to chnage status on Pending (In my situation server stay in Pending for all time and can&#39;t change it to Up) <br/> <br/> After that try to connect to one of the bucket by calling lcb_connect. <br/> Call lcb_wait to wait for connection is done. <br/> As a result lcb_wait work infinitly and timeout doesn&#39;t happen <br/> <br/> Below I share call stack in Red Hat Linux: <br/> #0 0x00000034350d4473 in __epoll_wait_nocancel () from /lib64/libc.so.6 <br/> #1 0x00002ad81b1dccc9 in ?? () from ./lib/libevent-2.0.so.5 <br/> #2 0x00002ad81b1c9cdc in event_base_loop () from ./lib/libevent-2.0.so.5 <br/> #3 0x00002ad8174c1dc6 in lcb_wait () from ./lib/libcouchbase.so.2 <br/> #4 0x000000000043c0e1 in Couchbase::connect (this=0x60df508) at couchbase_loader_source/couchbase.cpp:152 <br/> #5 0x000000000043c8b7 in connect_to_bucket (cbase=..., config=..., bucket_name=...) at couchbase_loader_source/couchbase.cpp:478 <br/> #6 0x0000000000440924 in couchbase_loader::writer_thread::writer_thread (this=0x60df480, config=..., bucket_name=..., dbh=...) at couchbase_loader_source/writer_thread.cpp:25 <br/> #7 0x000000000042168c in main (argc=1, argv=0x7fff22162028) at couchbase_loader_source/couchbase_loader.cpp:175 <br/> I reproduced a bug on Linux Rad Hat 5.0 x64 and on Windows XP x32 <br/> Couchbase server version 1.8.1 <br/> libcouchbase version 2.0.1 CCBC-147

function lcb_wait works infinitly after trying to connect (by calling lcb_connect) to Couchbase server that is on Pending state

Bug Major Closed Fixed Public Sergey Avseyev Haster Wed, 19 Dec 2012 06:25:30 -0600 Tue, 5 Mar 2013 16:07:54 -0600 Tue, 5 Mar 2013 15:47:44 -0600 2.0.1 2.0.4 library 0 1 I’ve investigated a little this problem and I have additional info. <br/> <br/> My error happened scenario: <br/> <br/> First of all I try to connect to some bucket (Primary for example) which is absent <br/> <br/> lcb_connect <br/> lcb_wait <br/> <br/> here I get error. Then I create bucket, destroy instance by calling lcb_destroy and try connect to bucket again: <br/> <br/> func_create_bucket() <br/> sleep(some_time) <br/> lcb_destroy() <br/> lcb_create() <br/> lcb_connect() <br/> lcb_wait() <br/> <br/> After that I receive 3 messages from my error_callback function, where errinfo is “Number of vBuckets must be a power of two &gt; 0 and &lt;= 65536” <br/> And deadlock happened in lcb_wait. <br/> I&#39;ve investigated this issue more deeply. <br/> The problem take place then connection timeout happend. <br/> <br/> connect <br/> lcb_wait <br/> &nbsp;&nbsp;lcb_io_run_event_loop (for Windows Platform) <br/> &nbsp;&nbsp;... <br/> &nbsp;&nbsp;select <br/> <br/> &nbsp;&nbsp;if (ret == 0) &lt;-- 0 then timeout happend <br/> &nbsp;&nbsp;{ <br/> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;-- Here our problems begin <br/> &nbsp;&nbsp;} <br/> <br/> After select returns zero code tries to reconnect in callback function(is it good idea? Maybe it is better to exit from loop and return error?), but some structures (as I think) are corrupted after that. <br/> After that event_loop calls select function, but timeout variable contain zero value (infinitly execution)... <br/> <br/> As I think, problem is near here could you post a piece of source code, demonstrating the issue? Possibly this patch has been fixed the issue <a href="https://github.com/couchbase/libcouchbase/commit/d4948192439e61a8cc23d5e8572e81db1aebef7f">https://github.com/couchbase/libcouchbase/commit/d4948192439e61a8cc23d5e8572e81db1aebef7f</a> <br/> <br/> Could you verify with libcouchbase from master? <br/> <br/> To do so either pull and build the sources: <br/> <br/> git clone <a href="git://github.com/couchbase/libcouchbase.git">git://github.com/couchbase/libcouchbase.git</a> <br/> cd libcouchbase <br/> ./config/autorun.sh &amp;&amp; ./configure &amp;&amp; make &amp;&amp; sudo make install <br/> <br/> or install from snapsot deb/rpm repositories, like for example for recent ubuntus <br/> <br/> sudo wget -O/etc/apt/sources.list.d/couchbase-snapshot.list <a href="http://packages.couchbase.com/snapshot/ubuntu/couchbase-ubuntu1110.list">http://packages.couchbase.com/snapshot/ubuntu/couchbase-ubuntu1110.list</a> <br/> sudo aptitude update <br/> sudo aptitude install libcouchbase-dev libcouchbase2-bin My code is very big :one application server creates many processes (couchbase_loader)(one process for each cache) and whose processes operate with couchbase. <br/> But also they cooperate with oracle database... <br/> If you want I can share all code, but you need Oracle to run it. Or I can try to write more simple testcase... <br/> <br/> Also I will check patch tomorrow and share results It looks good now. Thanks a lot Sergey, I reproduced this issue on Windows platform. <br/> Now it works more stable, but than I&#39;ve tried to create 9 buckets in same time by executing 9 copies of my program 4 of them deadlocked in lcb_wait function. Добавлена тестовая программа для воспроизведения проблемы Fixed invalid memory access in win32 plugin <a href="http://review.couchbase.org/24451">http://review.couchbase.org/24451</a> Duplicate CCBC-167 Rank 8609 Time In Status