Strange errors

[Ross]

Thank you very much. It turns out that one of the scripts has been
calling sysutils/muse which is linked against libkvm and gives this
errors. Adding "2>/dev/null" fixed the issue for now. As recompiling
the port didn't make the error go away.

On Mon, Jul 25, 2011 at 6:24 AM, Jeremy Chadwick
<freebsd at jdc.parodius.com> wrote:
> On Mon, Jul 25, 2011 at 06:10:32AM +0300, Ross wrote:
>> On Sun, Jul 24, 2011 at 2:38 PM, Jeremy Chadwick
>> <freebsd at jdc.parodius.com> wrote:
>> > On Sun, Jul 24, 2011 at 01:15:29PM +0300, Ross wrote:
>> >> I see many:
>> >> kvm_open: kvm_nlist: No such file or directory
>> >> in my error-log
>> >>
>> >> what is that? I searched this list and also googled but wasn't able to
>> >> find anything on this matter.
>> >>
>> >> I am running site on Pimcore. Every time the site is accessed new
>> >> lines are added to error.log.
>> >
>> > Have you recently rebuilt world/kernel on the system, or rebuild kernel
>> > but not world?
>>
>> I always rebuild the world along with the kernel. Just in case. And I
>> did recently. This system is running 8.2-STABLE by the way.
>
> Okay, then chances are there is some software (a port, etc.) on your
> machine which links to libkvm that needs to be rebuilt to pick up the
> underlying libkvm API/ABI changes.
>
>> > If so, there may have been changes to the KVM structure within libkvm or
>> > the kernel that could be manifesting themselves by showing anomalies of
>> > this sort in userland applications. ??Most commonly this shows up in
>> > utilities like "ps" or "top", both of which use libkvm.
>>
>> Both top and ps work as expected.
>
> Sorry -- I wasn't saying "if there's a problem top/ps will confirm it",
> I was saying that when libkvm changes and kernel/world are out of sync,
> usually top/ps are the first things to show kvm_nvlist issues.
>
>> > I'm not familiar with "Pimcore". ??If this software links to libkvm, you
>> > may need to rebuild the software to keep in sync with any KVM or kernel
>> > changes.
>>
>> This is just a CMS built on Zend Framework.
>
> Are you using anything like ZendOptimizer or eAccelerator?  Keep reading
> for why I ask that.
>
>> Another question: how can I catch who is writing this lines? I set
>> LogLevel to debug and apache flags to "-e debug" but it did not help.
>
> Do you have any web-oriented software on your machine that is compiled
> (not scripts, but actual compiled software) that hasn't been rebuilt
> since you rebuilt world/kernel?  If so, this software will need to be
> rebuilt.
>
> You will have to try and correlate HTTP requests in your access_log to
> the errors you see in your error_log, and then trace things backwards
> from there.  error_log contains output that goes to stderr, and the
> above error message is probably going to stderr hence it shows up in
> your logs.
>
> There is a way to find out what links to libkvm on the machine.  This
> won't be 100% accurate -- libkvm comes in two types, a static library
> (libkvm.a) and a shared library (libkvm.so.X).  If something links to
> the shared, ldd can find it.  If something links (thus pulls in
> statically) it becomes even more difficult to determine what software
> it is.  For the ldd stuff:
>
> find -X /usr/local -type f -print0 | xargs -0 ldd 2>/dev/null 1> output.txt
>
> Then open up output.txt in an editor (vi, etc.) and search for libkvm.
> Once you find an entry, scroll backwards/up a little bit until you find
> the correlating binary that links to it (e.g. /usr/local/bin/binary:).
>
> Finding statically-linked stuff that was built with libkvm.a is going to
> be much more painful.
>
> None of this looks for things like, say, executables in users' home
> directories that could have been built from source code (e.g.
> /home/user/public_html/mybinary.cgi) and linked to libkvm.
>
> If you don't want to deal with any of this, then the solution should be
> quite simple for system software: rebuild all of your ports.  If the
> problem continues after that, then it's very likely you're using some
> 3rd-party software that's binary-only (please contact your vendor to
> resolve this), or it's some software somewhere other than in /usr/local.
>
> --
> | Jeremy Chadwick                                jdc at parodius.com |
> | Parodius Networking                       http://www.parodius.com/ |
> | UNIX Systems Administrator                   Mountain View, CA, US |
> | Making life hard for others since 1977.               PGP 4BD6C0CB |
>
>