topic Re: 4gb seg fixup in Operating System - Linux

4gb seg fixup

Dess_sg — Mon, 04 Oct 2010 06:31:14 GMT

Hi all, I'm having a HP DL380G5 running RHEL5. Under the /var/log/messages, the following message keep coming out:

Oct 2 22:03:00 ss2 kernel: printk: 78325 messages suppressed.
Oct 2 22:03:00 ss2 kernel: 4gb seg fixup, process httpd (pid 9471), cs:ip 73:00eba4f2
Oct 2 22:03:05 ss2 kernel: printk: 144865 messages suppressed.
Oct 2 22:03:05 ss2 kernel: 4gb seg fixup, process java (pid 4787), cs:ip 73:00969057

What's the root cause?

Re: 4gb seg fixup

Steven Schweda — Mon, 04 Oct 2010 12:43:31 GMT

> What's the root cause?

Is Google broken? I know nothing, but a
simple Web search for the message seems to
find many things.

Re: 4gb seg fixup

Donny Jekels — Mon, 04 Oct 2010 23:50:13 GMT

nice

try google search

kernel + 4gb +seq +fixup

Re: 4gb seg fixup

Steven Schweda — Tue, 05 Oct 2010 02:06:44 GMT

> kernel + 4gb +seq +fixup

I would (and did) try:

"4gb seg fixup"

> Oct 4, 2010 13:43:31 GMT 0 pts

You might find that you'll get more help if
you try the simple and obvious things
yourself, and _then_ ask for help when they
don't do what you need. People who demand
help, but who don't try to help themselves,
are often ignored.

Re: 4gb seg fixup

Dess_sg — Tue, 05 Oct 2010 02:30:00 GMT

Is there a guideline as in what kind of question must google and which kind of question can be posted here?

I appreciate our advice but isn't that what forums for? Question and answer, and also leave a trace for people who encounter same problem in the future can get hints from my post?

I have been google-ing for many days until i decided to post a question here. But it seems this forums is only opened for professional and questions have to be approved by some of the senior here.

Nevertheless, have a nice day. Good bye.

Re: 4gb seg fixup

Steven Schweda — Tue, 05 Oct 2010 03:17:37 GMT

> I appreciate our advice but isn't that what
> forums for? [...]

I believe that these forums are most useful
for dealing with problems which are not
already documented in (many) other places.
But, if you can find someone here who is
willing to do your whole job for you, then
you have my blessing.

> I have been google-ing for many days [...]

My psychic powers were too weak to tell me
that. And you learned nothing from it?

Re: 4gb seg fixup

Alan_152 — Tue, 05 Oct 2010 13:49:12 GMT

Well, as opposed to everyone else, I think I might have something to contribute here.

I've seen this before in reference to java memory leaks.. The first thing I would recommend is to confirm that your JRE is current. The second thing I would do is to use top or ps to see if your physical memory utilization is maxed out.

Re: 4gb seg fixup

Matti_Kurkela — Wed, 06 Oct 2010 17:08:50 GMT

Are you using Xen virtualization? (Is it the version that comes with RHEL5 AS, or some other version?)

If you are using Xen, Google showed me these messages might mean your httpd and java processes are using "regular" system libraries instead of the "Xenified" ones.

If you run this command:

cat /etc/ld.so.conf.d/kernelcap-`uname -r`.conf

The response should include this:

hwcap 0 nosegneg

If the file does not exist or does not contain "hwcap 0 nosegneg", fix it, then run "ldconfig", and then restart all the processes that are mentioned in the "4gb seg fixup" messages.

In RHEL 5, the important file seems to come with the "kernel-xen" RPM, at least on the RHEL 5.5 update level. (If you're running RHEL 5.4 or older, please update, then reboot so that the system can start using the updated kernel.

MK