[Bug 211871] poll() is probably broken in 11.0-RC1

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Mon Aug 15 15:51:19 UTC 2016


            Bug ID: 211871
           Summary: poll() is probably broken in 11.0-RC1
           Product: Base System
           Version: 11.0-RC1
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: afiskon at devzen.ru


I'm a contributor to PostgreSQL project. After upgrading FreeBSD from
11.0-BETA4 to 11.0-RC1 I noticed something very weird. Here are steps to

sudo pkg install git-lite bison perl5 gmake
git clone git clone http://git.postgresql.org/git/postgresql.git
cd postgresql
# for the record - I'm on 9389fbd0
./configure --enable-tap-tests --enable-cassert --enable-debug
gmake -j4 -s
gmake check

On 11.0-RC1 `gmake check` hangs like this:

     returning                ... ok
     largeobject              ... ok
     with                     ... ok
     xml                      ... ok
test event_trigger            ... ok
test stats                    ... 

This issue reproduces in 100% of cases. From what I can tell (judging by DTrace
and stacktraces in gdb) it looks like poll() was broken. Sometimes it doesn't
see changes.

As a side note you shouldn't probably believe me on bare word here since I'm
not familiar with this particular part of PostgreSQL and I have no experience
in debugging a kernel. The real issue could be somewhere else.

Naturally it could be a bug in PostgreSQL's code. But it works flawlessly not
only on Linux distributions but also on 10.3 (I've just re-checked). There is
currently a feature freeze in PostgreSQL project. So there were no major
changes in a code recently (like three months). Thus I believe it's most likely
a bug in a kernel.

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