FBSD 5.2.1-p4 and mysqld problems [RESOLVED]

[Daryl Chance]

yes,  we resolved the issue it looks like.  I wanted
to hold off on announcing this until i was sure, but
it's been running for about 24 hours now without a
lockup.

options MAXDSIZ="(1024*1024*1024)" # change max from
512M to 1G
add that to your kernel config.

basically whats happening ( and i'm probably wrong
with the technicals on this, but bear with me :D ) is
that mysqld would aquire a lock (on a table more then
likely) and then try to allocate above the FBSD 5.2
max default memory size (512M).  when it did this, it
crashed and left the lock on the table.  from there it
just froze.

making that change seems to have fixed it.  it was
never evident before because we had a slower webserver
that wasn't loading the sql server all that much.  now
it is, and we started developing problems. :).

as you can tell with this link: 
http://sql.tribalwar.com/before-ps.txt the mysqld proc
wen't above 512M.

check your sql.err log, if you're getting a malloc
error, then this is more then likely your problem.

Thanks to everyone for the help in tracking this down.

Let me know if this fixes the problem for you.  Also,
are you running -CURRENT in production? or testing?  I
had given some thought to upgrading the box to
-CURRENT after the commit for the network stack
settled.  But I first need to get serial console
enabled on it :).

Daryl

--- Ganbold <ganbold at micom.mng.net> wrote:
> Hi Daryl,
> 
> I have exactly same problem as you. I have FreeBSD
> 5.2-CURRENT (did cvsup 
> on March 23) with mysql-4.0.18 from ports
> collection.
> It is compiled with linuxthreads. Mysql is working
> fine, except it 
> sometimes freezes, sometimes one or two tables get
> corrupted.
> Usually freezes once per day. Just freezes and I had
> to kill mysql process 
> and start.
> 
> Did you solve your problem? I also downloaded latest
> snapshot from 
> mysql.com web site and installed, but nothing
> changes.
> Let me know if you find something.
> 
> TIA,
> 
> Ganbold
> 
> 
> At 12:48 PM 03.04.2004, you wrote:
> >ah! thanks :)
> >
> >It just happened again and I was able to collect
> the
> >data again.
> >
> >Before I did mysqladmin shutdown/killall -11 mysqld
> >http://sql.tribalwar.com/before-ps.txt
> >
> >a few times the 3 giant processes would show as -,
> but
> >then it got to the point where they weren't
> changing
> >one bit (staying at Giant)
> >
> >after I did mysqladmin shutdown/killall -11 mysqld
> >http://sql.tribalwar.com/after-ps.txt
> >
> >this eventually cleared up after a minute or so.
> >
> >I've given some serious thought to upgrading to
> >-CURRENT, but with the network stack commit comming
> >soon (or happening now), I don't want to get caught
> in
> >the middle of it and have severe problems. Perhaps
> I
> >should use a tag for the time right around the
> sysctl
> >change for the mp stack?
> >
> >The guy running the site just wants me to (have
> >someone at the colo) format the machine and go back
> to
> >4.9.
> >
> >Oh, I now have witness in the kernel...no deadlocks
> >from what I've seen.
> >
> >HTH,
> >Daryl
> >
> >--- Doug White <dwhite at gumbysoft.com> wrote:
> > > On Fri, 2 Apr 2004, Daryl Chance wrote:
> > >
> > > > Thanks for your response.  It just happened a
> few
> > > > minutes ago and i was able to capture all the
> > > output
> > > > into a text file.
> > > >
> > > > http://sql.tribalwar.com/ps.txt
> > >
> > > oops, sorry, I get those confused. You want 'ps
> > > axlwww'.  WCHAN will be a
> > > string like "select".
> > >
> > > > I have WITNESS* options compiled into the
> kernel
> > > and
> > > > am going to reboot soon.  Do you think it
> would
> > > help
> > > > in debugging this to see if there are any
> > > deadlocks?
> > >
> > > Potentially, although I get 100% cpu loops with
> kde
> > > that won't trigger any
> > > witness or invariants checks.
> > >
> > > --
> > > Doug White                    |  FreeBSD: The
> Power
> > > to Serve
> > > dwhite at gumbysoft.com          |  www.FreeBSD.org
> >
> >
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