<div dir="ltr">Hi <span id="gmail-a7082633-bfe6-4367-bf69-a5b3ab53d290" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-59c98e60-ea0f-439e-b168-58c715bd20e0" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-c4983c8a-74eb-441f-be26-295f34b65dfd" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-2c594021-2989-4031-817f-daa5e877102d" class="gmail-GINGER_SOFTWARE_mark">ishii</span></span></span></span>-San<div><br></div><div>I am looking into the issue <a href="http://www.pgpool.net/mantisbt/view.php?id=249">http://www.pgpool.net/mantisbt/view.php?id=249</a>, where pgpool-II sometimes does not de-escalations while shutting down. And as per the bug report, the issue starts to appear after this commit.<br></div><div><br></div><div>Although I am not able to replicate the exact reported issue but It seems like the changes made by this commit can leave the zombie processes. </div><div><br></div><div>As we are replacing the wait<span id="gmail-5a8a8c67-afb4-465b-88f1-27bd8ad9834a" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-1acf7ae7-17ab-43cc-8f80-26b8aebc825c" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-66e1b27a-375f-466f-a8a6-1cb0f700d84e" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-66e1b27a-375f-466f-a8a6-1cb0f700d84e" class="gmail-GINGER_SOFTWARE_mark">(</span></span></span></span>NULL) with <span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark">waitpid</span></span></span></span><span id="gmail-3af26a72-bcc5-4721-aa6a-3a398fc76d04" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-33d6c80d-e839-409f-a805-d9ce2282d4e6" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-b0a2446d-b7ee-419a-a9f4-3dd75608da27" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-b0a2446d-b7ee-419a-a9f4-3dd75608da27" class="gmail-GINGER_SOFTWARE_mark">(</span></span></span></span><span id="gmail-65ee18ae-cf55-44ae-8f77-5d9bf1a7685a" class="gmail-GINGER_SOFTWARE_mark">,</span>.<span id="gmail-a5afa313-bd6b-4876-adac-3f04b878465d" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-310312d5-7e40-4b21-84d9-50eb62a610d2" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-310312d5-7e40-4b21-84d9-50eb62a610d2" class="gmail-GINGER_SOFTWARE_mark">.</span></span></span>WNOHANG)</div><div><br></div><font face="monospace, monospace">@@ -1365,<span id="gmail-21084d4f-26e3-4432-8b2b-3695bca51a82" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-b4fa1ac4-8c92-4ca4-a9af-8021909a1bd2" class="gmail-GINGER_SOFTWARE_mark">8 +1367</span></span>,10 @@ static RETSIGTYPE exit_handler<span id="gmail-0abc18af-6014-45a1-b876-e76eb12478de" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-882ba5bc-93d7-444b-bc00-14ffdf1a0b66" class="gmail-GINGER_SOFTWARE_mark">(</span></span>int <span id="gmail-a9fa0e41-b11e-4840-8ff8-cb8a875d568e" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-cb7eb2c6-aeae-4a30-b989-0dd7d45fd3f8" class="gmail-GINGER_SOFTWARE_mark">sig</span></span>)<br>        POOL_SETMASK<span id="gmail-a58ac866-5f13-4d16-bf39-c2e04b505f82" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-8189c2c0-65e1-4547-87eb-962f1bd54552" class="gmail-GINGER_SOFTWARE_mark">(</span></span>&amp;UnBlockSig);<br>     <span id="gmail-3a4debf5-75f6-409a-8ea6-7305fd0b66e2" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-fceb9cce-1b02-4888-b4aa-932925e5dba7" class="gmail-GINGER_SOFTWARE_mark">do</span></span><br>     {<br>-        <span id="gmail-a056691b-b86d-460a-9c50-63f711ee17fd" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-1a6389fc-acbc-4292-a630-3207c26ebdb9" class="gmail-GINGER_SOFTWARE_mark">wpid</span></span> = wait<span id="gmail-f89e059b-832e-48b1-ba9a-a5c7e2599511" class="gmail-GINGER_SOFTWARE_mark"><span id="eba39dcc-c8ad-4afd-81b1-a7480ee36a86" class="gmail-GINGER_SOFTWARE_mark gmail-GINGER_SOFTWARE_mark gmail-GINGER_SOFTWARE_mark GINGER_SOFTWARE_mark">(</span></span>NULL);<br>-<span id="gmail-a76b650a-6a48-4bea-8644-d44befcb3faf" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-0856dbee-76e2-48de-8bc9-db8075b5b696" class="gmail-GINGER_SOFTWARE_mark">    }</span></span><span id="gmail-6d3ce3d2-fdef-46b6-a4ac-9421c58bbbb8" class="gmail-GINGER_SOFTWARE_mark"><span id="eb2823d5-5a82-4ad1-ad82-c30b72c36fe0" class="gmail-GINGER_SOFTWARE_mark gmail-GINGER_SOFTWARE_mark gmail-GINGER_SOFTWARE_mark GINGER_SOFTWARE_mark">while</span></span> (<span id="gmail-1efdcdff-867c-4453-aebf-1b6e92633b69" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-aa7b75db-e2e4-4a1f-8c82-10317752e3aa" class="gmail-GINGER_SOFTWARE_mark">wpid</span></span> &gt; 0 || (<span id="gmail-59e468cb-30c2-49e9-bff2-1ca6e6fbfde5" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-646b85ce-d3ba-422c-ad8d-f55cb8d54116" class="gmail-GINGER_SOFTWARE_mark">wpid</span></span> == -1 &amp;&amp; <span id="gmail-b9c86870-01ac-49e2-9fa2-be7e7aa68477" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-4ede29e1-b601-4cb5-8061-9ae9266bb94d" class="gmail-GINGER_SOFTWARE_mark">errno</span></span> == EINTR));<br>+               <span id="gmail-1bd7bc6b-41bf-4a35-ae69-52ef9b50af12" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-4ce4c9a4-8e8c-4dfe-b173-e927516e5ce7" class="gmail-GINGER_SOFTWARE_mark">int</span></span> ret_pid;<br>+        wpid = waitpid(-1, &amp;ret_pid, WNOHANG);<br>+<span id="gmail-9d79c838-352d-423e-bba1-a8da32d43e7f" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-57c6de2b-4a1e-4020-a9c4-549572d0aa12" class="gmail-GINGER_SOFTWARE_mark">    }</span></span> while (<span id="gmail-68db0a73-37f8-4e4c-9168-0e5c5f4eae0d" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-0190e7b4-9245-486b-a831-ec1d1b6411b2" class="gmail-GINGER_SOFTWARE_mark">wpid</span></span> &gt; 0 || (<span id="gmail-fa079154-7353-4101-9e1d-385ca7c489ed" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-d3396908-8b0c-41b5-9128-1517a7f1c1bc" class="gmail-GINGER_SOFTWARE_mark">wpid</span></span> == -1 &amp;&amp; <span id="gmail-f31eb19c-2f40-4080-9a0c-6f1ff993f042" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-dcb08a00-1a17-48d6-b2dc-91d66351ce29" class="gmail-GINGER_SOFTWARE_mark">errno</span></span> == EINTR));<br></font><p class="gmail-p1"><span class="gmail-GINGER_SOFTWARE_mark">The problem with this logic is that after replacing the wait<span id="gmail-5a8a8c67-afb4-465b-88f1-27bd8ad9834a" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-1acf7ae7-17ab-43cc-8f80-26b8aebc825c" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-66e1b27a-375f-466f-a8a6-1cb0f700d84e" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-66e1b27a-375f-466f-a8a6-1cb0f700d84e" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-29cac04e-29d0-4e2c-923f-9802d435f678" class="gmail-GINGER_SOFTWARE_mark">(</span></span></span></span></span>NULL) with <span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"></span></span></span></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"></span></span></span></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"></span></span></span></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"></span></span></span></span><span class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9773373d-dc8e-4f8a-803a-197b3eae1afc" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-9e595924-94bf-4248-b169-24dfcf66e5ce" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-88bed7aa-85c1-495a-a5e9-bee93fe7c701" class="gmail-GINGER_SOFTWARE_mark">waitpid</span></span></span></span></span><span id="gmail-3af26a72-bcc5-4721-aa6a-3a398fc76d04" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-33d6c80d-e839-409f-a805-d9ce2282d4e6" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-b0a2446d-b7ee-419a-a9f4-3dd75608da27" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-b0a2446d-b7ee-419a-a9f4-3dd75608da27" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-4deb37c4-9bb8-4fc9-9e10-11cf19cc2901" class="gmail-GINGER_SOFTWARE_mark">(</span></span></span></span></span><span id="gmail-65ee18ae-cf55-44ae-8f77-5d9bf1a7685a" class="gmail-GINGER_SOFTWARE_mark">,</span><span id="gmail-a5afa313-bd6b-4876-adac-3f04b878465d" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-310312d5-7e40-4b21-84d9-50eb62a610d2" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-310312d5-7e40-4b21-84d9-50eb62a610d2" class="gmail-GINGER_SOFTWARE_mark">.</span></span></span><span id="e06e9b74-3649-44b6-b87d-4429fc3578ad" class="gmail-GINGER_SOFTWARE_mark GINGER_SOFTWARE_mark">.</span>WNOHANG) we </span><span class="gmail-GINGER_SOFTWARE_mark">can move forward without waiting for all child process to finish, especially if some child process takes a little longer to finish. Since</span> <span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-93754ac7-5810-416c-b8e0-a4afb73ce6f9" class="gmail-GINGER_SOFTWARE_mark"></span></span><span id="gmail-3025755c-abe0-406a-871c-b7a6e6e0adc1" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-93754ac7-5810-416c-b8e0-a4afb73ce6f9" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-621fb846-cf1e-4691-b947-95fe620ced85" class="gmail-GINGER_SOFTWARE_mark">waitpid</span></span></span><span id="gmail-76dce1e1-1f7d-4adc-a1ee-edea8faa33d3" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-0cf117c7-02ee-4eb9-b12b-7af931bc1af7" class="gmail-GINGER_SOFTWARE_mark"><span id="gmail-366e4dd8-d931-44fc-a995-a77cf7b89044" class="gmail-GINGER_SOFTWARE_mark">(</span></span></span>) returns 0 indicating that there is no exiting process at the moment, even when the child processes exists. <span class="gmail-GINGER_SOFTWARE_mark">For example, at the time of system shutdown, the watchdog process sometimes takes few seconds to execute the de-escalation process before exiting, and meanwhile in the main process as soon as </span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e621559" class="gmail-GINGER_SOFTWARE_mark"></span><span id="gmail-8aa53107-0522-42fc-8755-2d705e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</div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jul 7, 2016 at 11:55 AM, Tatsuo Ishii <span dir="ltr">&lt;<a href="mailto:ishii@postgresql.org" target="_blank">ishii@postgresql.org</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Fix usage of wait(2) in pgpool main process<br>
<br>
Per [pgpool-hackers: 1444]. Here is the copy of the message:<br>
<br>
Hi Usama,<br>
<br>
I have noticed that the usage of wait(2) in pgpool main could cause<br>
infinite wait in the system call.<br>
<br>
    /* wait for all children to exit */<br>
    do<br>
    {<br>
        wpid = wait(NULL);<br>
    }while (wpid &gt; 0 || (wpid == -1 &amp;&amp; errno == EINTR));<br>
<br>
When child process dies, SIGCHLD signal is raised and wait(2) knows<br>
the event. However, multiple child death does not necessarily creates<br>
exact same number of SIGCHLD signal as the number of dead children and<br>
wait(2) could wait for an event which never happens in this case. I<br>
actually encountered this situation while testing pgpool-II. Solution<br>
is, to use waitpid(2) instead of wait(2).<br>
<br>
Branch<br>
------<br>
master<br>
<br>
Details<br>
-------<br>
<a href="http://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=0d1cdf96feb77de6f1dfc2d46ecd7467325d1f79" rel="noreferrer" target="_blank">http://git.postgresql.org/<wbr>gitweb?p=pgpool2.git;a=<wbr>commitdiff;h=<wbr>0d1cdf96feb77de6f1dfc2d46ecd74<wbr>67325d1f79</a><br>
<br>
Modified Files<br>
--------------<br>
src/main/pgpool_main.c | 12 ++++++++----<br>
1 file changed, 8 insertions(+), 4 deletions(-)<br>
<br>
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</blockquote></div><br></div>