2.6.9-42.0.3.ELsmp kernel woes

chilihost

Well-Known Member
Mar 1, 2005
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I just upgraded cPanel on one of our servers running CentOS 4.4 and it forced a kernel upgrade from 2.6.9-42.0.2.ELsmp to 2.6.9-42.0.3.ELsmp and now the system is running with a high load average (averaging about 2.0-2.5).

Has anyone else noticed this? I am going to reboot back to 42.0.2

And why is cPanel forcing a kernel upgrade now? This is new since 10.9.0 and I for one am NOT happy with this.
 

chilihost

Well-Known Member
Mar 1, 2005
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after rebooting into 42.0.2, the load average has stabalized in the 0.25-0.75 range and this server is running nicely again.

Has anyone else experienced the same?
 

lehels

Well-Known Member
Jul 10, 2006
91
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156
high load

hello,

We are experiencing the same issue here, but much higher load that you mentioned [about: 20-30 Load average],
How many domains are you have on that server?
Wich is the total size of the mysql databases?

cheers,
 

matthewdavis

Well-Known Member
Jun 26, 2003
90
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156
NC, USA
The problem I had with the 42.0.3 kernel was a kernel panic while I was restoring accounts. Looking at the panic it looked to be related to quota. I haven't gotten around to filing a bug with Red Hat yet.
 

ispro

Well-Known Member
Verifed Vendor
Apr 8, 2004
628
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The problem I had with the 42.0.3 kernel was a kernel panic while I was restoring accounts. Looking at the panic it looked to be related to quota. I haven't gotten around to filing a bug with Red Hat yet.
We have it on TWO different servers with SMP 2.6.9-42.0.3 kernel (RHEL4).

Server hangs on "Restoring quota". One of the servers is P4 Dual core and another is high-end Dual Woodcrest...

The pity is that servers are new and we have no older kernels to reboot.

Transferring accounts to them is VERY annoying task!
 

matthewdavis

Well-Known Member
Jun 26, 2003
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NC, USA
I would really like to see the output of the kernel panic. I'm going to PM you an email address to send them to if that would be ok.

But you can download and install a different kernel and install it manually. Using these commnads it should work:

# up2date --get kernel-2.6.9-42.0.2.EL.i686
and/or
# up2date --get kernel-smp-2.6.9-42.0.2.EL.i686

That would download the kernel to /var/spool/up2date and you can install it from that dir. Using:

# rpm -ivh /var/spool/up2date/kernel-smp-2.6.9-42.0.2.EL.i686.rpm
 

bmorrice

Registered
Sep 12, 2006
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we are experiencing the same issues as matthewdavis, its hard to recreate - but when account transfers or account creations occur we get a kernel panic related to quota as well.

this however hasn't been limited to the 2.6.9-42.0.3.EL.i686, we have had the issue happen on 2.6.9-42.0.3.EL.i686

At the moment this is only happening on one of our cpanel boxes, and happens every ~10 or so days....

ben
 

IRCBrasil

Well-Known Member
Jul 22, 2004
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156
Same problem here. Looking at log when the server crash, I found this:

kernel: kernel BUG at fs/dquot.c:422!

some idea?
 

gemby

Well-Known Member
PartnerNOC
Feb 16, 2002
182
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316
Pula, Croatia
cPanel Access Level
DataCenter Provider
after rebooting into 42.0.2, the load average has stabalized in the 0.25-0.75 range and this server is running nicely again.

Has anyone else experienced the same?
I have same issue here, currently running 42.0.3 please confirm that high server loads has gone away after booting in 42.0.2. Server is mostly running ok, but after few days, some basic i/o commands a damn slow, eg. mkdir takes 5-6 seconds or so.....
 

mickalo

Well-Known Member
Apr 16, 2002
782
5
318
N.W. Iowa
I have same issue here, currently running 42.0.3 please confirm that high server loads has gone away after booting in 42.0.2. Server is mostly running ok, but after few days, some basic i/o commands a damn slow, eg. mkdir takes 5-6 seconds or so.....
what is the best way to reboot to another kernel version as we also run 42.0.3 and have noticed alot of minor problems. does something need to be changed in the grub.conf prior to reboot?

we run RHEL 4 - 2.6.9-42.0.3.ELsmp #1 SMP

thx's
Mickalo
 

gemby

Well-Known Member
PartnerNOC
Feb 16, 2002
182
0
316
Pula, Croatia
cPanel Access Level
DataCenter Provider
what is the best way to reboot to another kernel version as we also run 42.0.3 and have noticed alot of minor problems. does something need to be changed in the grub.conf prior to reboot?

we run RHEL 4 - 2.6.9-42.0.3.ELsmp #1 SMP

thx's
Mickalo
It is simple, pico /boot/grub/grub.conf and edit default= line, first kernel below is 0 second in list is 1 etc....
 

gorilla

Well-Known Member
Feb 3, 2004
695
1
168
Sydney / Australia
I just installed the 2.6.9-42.32 kernel and it seems to be working fine

Check below the few steps .
Please be aware that I am using the 64bit version as I am running a dualcore opteron, for intel you should use the 32bit (686) version from the link here
http://people.redhat.com/~jbaron/rhel4/RPMS.kernel/

log into your server,


wget http://people.redhat.com/~jbaron/rhel4/RPMS.kernel/kernel-smp-2.6.9-42.32.EL.x86_64.rpm

and after the download has completed, install the kernel

rpm -ivh kernel-smp-2.6.9-42.32.EL.x86_64.rpm

Check to see if the new kernel is installed by default in grub.conf

cat /boot/grub/grub.conf

Default should be 0
And the kernel you've just installed should be the first one

reboot the server and check what kernel your system is using with uname -a
 

matthewdavis

Well-Known Member
Jun 26, 2003
90
0
156
NC, USA
Don't install that kernel unless you know what your doing. Thats an unofficial kernel by a Red Hat engineer ment for testing purposes. Not to be run on a production system.
 

mike25

Well-Known Member
Aug 29, 2003
83
0
156
Raleigh NC, USA
I am seeing this as well with the 2.6.9-42.0.3.ELsmp kernel, Only so far while transferring accounts between servers. Is anyone having this problem with the 2.6.9-42.0.2.ELsmp Kernel? sounds like a downgrade is teh way to go. I would also perfer that cpanel not force a kernel upgrade unless there is a major security hole discovered. Many of us spend a good deal of time hacking our kernels for performance benefits.
 

IRCBrasil

Well-Known Member
Jul 22, 2004
93
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156
With 2.6.9-42.0.2.ELsmp Kernel I never had this problem, but I did upgrade to 2.6.9-42.0.3.ELsmp Kernel becouse there was a security hole on .0.2.



I would also perfer that cpanel not force a kernel upgrade unless there is a major security hole discovered. Many of us spend a good deal of time hacking our kernels for performance benefits.
Is not a bug correction that make the system crash, a good reason to upgrade the kernel?
 

MN-Robert

Well-Known Member
Feb 19, 2003
203
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166
The problem I had with the 42.0.3 kernel was a kernel panic while I was restoring accounts. Looking at the panic it looked to be related to quota. I haven't gotten around to filing a bug with Red Hat yet.
We've had this problem for quite some time probably 4-6 months. We are at softlayer if that makes any difference.

The previous kernel 2.6.9-42.0.2.ELsmp also displayed these problems see the redhat bug report for further info.
 
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IRCBrasil

Well-Known Member
Jul 22, 2004
93
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156
We've had this problem for quite some time probably 4-6 months. We are at softlayer if that makes any difference.
I am with this bug only at my 2 servers at softlayer (both servers are dual core 3.0 with SATA HDs). My servers at The Planet (one P4 2.8 with SATA and another dual xeon 2.8 with SATA), running the same 42.0.3 kernel, dont have this problem.
All servers (softlayer and the planet) running RH 4.0.
 

MN-Robert

Well-Known Member
Feb 19, 2003
203
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166
Yes that's why I mentioned it. We have servers elsewhere running the stock standard kernel and it works fine. Softlayer compile their own for their own setup which I believe is causing the issues. But since we have had servers their the issue has existed (March or April 06)